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| NJW4120 Lithium-ion Battery Charger Controller IC with Timer GENERAL DESCRIPTION PACKAGE OUTLINE NJW4120 is a 1-cell and 2-cell lithium ion battery charge control IC with a built-in AC-DC secondary side control feature. Using a photocoupler to directly feed back optimum charging voltage and current information to the primary side, it increases energy efficiency, makes possible a smaller charger, and conserves energy. Charging current can be freely set and therefore it is NJW4120M possible to optimize charging according to battery capacity. As safety features it has over voltage, over discharge, temperature detection, and a charge over timer. Also, the adaptor and the charge control circuit are mounted on one chip. FEATURES Charge Control Feedback by Photocoupler Adjustable Charge Voltage Adjustable Pre-Charge and Full Charge Current Temperature Monitor Over Charge Timer Internal Re-Charge function Delay timers and Hysteresis inputs for high noise immunity Over Discharge Battery Detect Over Voltage Protection Bi-CMOS Technology Package Outline NJW4120M : DMP20 NJW4120V : SSOP20 PIN CONFIGURATION P-CHG NFB TX-SW GND PC ADP LED-G LED-R C1 C2 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 NJW4120V Q-CHG CS1 CS2 VS VREF V+ TDET TH TL CHG-SW NJW4120M NJW4120V Ver.2005-03-09 -1- NJW4120 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Operating Voltage V+ C1 Pin Voltage VC1 C2 Pin Voltage VC2 TDET Pin Voltage VTDET TX-SW Pin Output Current ISINK-SW PC Pin Output Current ISINK-PC LED-G Pin Output Current ISINK-G LED-R Pin Output Current ISINK-R Power Dissipation Operating Temperature Range Storage Temperature Range PD Topr Tstg MAXIMUM RATINGS +15 +5 +5 +5 50 50 20 20 DMP20 :300 SSOP20 :300 -20~+85 -40~+125 UNIT V V V V mA mA mA mA mW C C ELECTRICAL CHARACTERISTICS (V+=5V, Ta=25C) PARAMETER General Characteristics Operating Voltage Operating Current Under Voltage Lockout Block ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage Reference Voltage Block Reference Voltage Load Regulation Voltage Detection Block Quick Charge Detection Voltage Re-Charge Detection Voltage Over Voltage Detection Voltage Charge Control Block Reference Voltage Adaptor Control Block Reference Voltage VS Pin Input Bias Current Battery Connected Detection Voltage VQ-CHG VR-CHG VOV VREF-CV VREF-ADP IVS VT-TDET VS=2.1V TDET Pin VS: LH VS: HL VS: LH VS Pin VBAT VBAT VBAT x 0.71 x 0.73 x 0.75 VBAT VBAT VBAT x 0.94 x 0.95 x 0.96 VBAT VBAT VBAT x 1.015 x 1.025 x 1.035 2.08 1.228 - - 2.1 1.24 50 1.15 2.12 1.253 500 - V V V V V nA V SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT VOP ICC CHG-SW: OPEN 2.7 - - 2 14 3 V mA VT-ON VT-OFF VHYS 2.2 2.0 100 2.4 2.2 200 2.6 2.4 300 V V mV VREF VREF IREF=0mA IREF=0mA~1mA 1.228 - 1.24 - 1.253 10 V mV Low Voltage Detection (2mA Charge) Block Charge Current ICHG1 Low Voltage Detection Voltage VLV VS=1V VS: LH 1 2 3 VBAT VBAT VBAT x 0.505 x 0.525 x 0.545 mA V -2- Ver.2005-03-09 NJW4120 ELECTRICAL CHARACTERISTICS (V+=5V, Ta=25C) PARAMETER Current Detection Block Pre-Charge /Quick Charge Block Voltage Gain Full Charge Detection Voltage CS1 Pin Input Bias Current CS2 Pin Input Bias Current Photocoupler Out Block Photocoupler Out Saturation Voltage PC Pin Leak Current TX-SW Out Block TX-SW Out Saturation Voltage TX-SW Pin Leak Current LED Out Block LED-G Pin Saturation Voltage LED-G Pin Leak Current LED-R Pin Saturation Voltage LED-R Pin Leak Current Timer Block OSC1 Timer Error Time OSC2 Timer Error Time CHG-SW Block ON Threshold Voltage OFF Threshold Voltage Pull-up Resistance SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT AV1 VF ICS1 ICS2 CS1=3.8V, CS2=3.6V CS2=4.2V, VS=2.1V CS1=4.2V CS2=4.2V 11.5 8 - - 12 12 10 10 12.5 16 500 500 dB mV nA nA VOL-PC ILEAK-PC I SINK=20mA V+=14V - - 0.2 - 0.5 1 V A VOL-SW ILEAK-SW I SINK=20mA V+=14V - - 0.2 - 0.5 1 V A VOL-G ILEAK-G VOL-R ILEAK-R I SINK=10mA V+=14V I SINK=10mA V+=14V - - - - 0.2 - 0.2 - 0.5 1 0.5 1 V A V A T1 T2 C1=C2=0.01F external Not including external deviation -10 -10 - - +10 +10 % % VSW-ON VSW-OFF RPULL-UP - 1 300 - - 500 0.25 - 700 V V k Ver.2005-03-09 -3- NJW4120 TYPICAL APPLICATION Input VREF RA1 RA2 V + Adaptor Output PC RP1 RP2 RQ1 RQ2 Q-CHG PC ADP NFB P-CHG Quick Charge Control Pre-Charge Control CVCC-ON TX-SW VREF1 CVCC-ON Reference Voltage 1 1.24V Reference Voltage 2 2.1V 12dB CS1 CS2 Rcs VREF VREF1 CVCC-ON VREF2 CVCC-ON RB1 VS RB2 Full Charge Detection Quick Charge 1-cell: RB1 = 2-cell: RB1 = VBAT x 0.73 VREF2 GND CVCC-ON CS1 pin Quick/ Pre-Charge Charge ON/OFF 2mA Charge 6dB RB2 3xRB2 Re-Charge CLK OSC 1 PreCharge Timer Start/Stop Time Out Battery Voltage Detection Over Voltage Detection Low Voltage Detection VBAT x 0.95 VBAT x 1.025 C1 VREF VBAT x 0.525 C2 OSC 2 Full Charge Timer Start/Stop Time Out Low Temperature Detection High Temperature Detection TDET TH TL LED-G LED-G Charge -ON Battery Connected Detection V + LED-R LED-R Control Logic RPULL-UP V + UVLO Lithium Ion Battery GND CHG-SW -4- Ver.2005-03-09 NJW4120 PIN CONFIGULATION Pin No. Pin Name 1 P-CHG 2 NFB 3 TX-SW 4 GND 5 PC 6 ADP 7 LED-G 8 LED-R 9 C1 10 C2 11 CHG-SW 12 TL 13 TH 14 TDET 15 V+ 16 VREF 17 VS 18 CS2 19 CS1 20 Q-CHG Function Pre-Charge Current Setting Current-Regulation-Loop Compensation Switch Transistor connection GND Photocoupler connection for the first side feedback Adaptor Control Voltage Setting LED Output LED Output Pre-Charge Timer, 2mA Charge Timer, LED Blinking Cycle, Delay Time Setting Quick Timer Setting Charge ON/OFF Control Batteries Thermal (High Temperature) Setting Batteries Thermal (Low Temperature) Setting Battery Temperature Detection, Battery Connected Detection Operating Voltage Reference Voltage Output Battery Voltage Detection Charge Current Detection 2 Charge Current Detection 1 Quick Charge Current Setting CHARGE VOLTAGE / CURRENT for RESISTANCE SETTING Parameter Calculation formula Adaptor Output Voltage Charge Control Voltage Low Voltage Detection Voltage Quick Charge Start Voltage Re-Charge Detection Voltage Over Voltage Detection Voltage Pre-Charge Current Quick Charge Current Full Charge Current IP-CHG = ( IQ-CHG = ( VADP = RA1 + RA 2 x VREF-ADP (1.24V) RA 2 RB1 + RB2 x VREF-CV (2.1V) VBAT = RB2 VBAT x 0.525 VBAT x 0.73 VBAT x 0.95 VBAT x 1.025 RP2 x VREF (1.24V) / 4) / RCS RP1 + RP2 RQ2 x VREF (1.24V) / 4) / RCS RQ1 + RQ2 Examples of calculation 5.0V 4.2V 2.21V 3.07 V 3.99 V 4.305 V 100mA 750mA 60mA 10V 8.4V 4.41V 6.13 V 7.98 V 8.61 V (at. RP1:232k, RP2:16k, RCS=0.2) (at. RQ1:128k, RQ2:120k, RCS=0.2) IF-CHG = (96mV / 8) / RCS (at. RCS=0.2) Ver.2005-03-09 -5- NJW4120 TYPICAL CHARACTERISTICS Adoptor Control Block Reference Voltage (V) V Charge Control Block Reference Voltage 2.12 2.11 2.1 2.09 2.08 -50 v.s Temperature (V+=5V, VS Pin) Adoptor Control Block Reference Voltage 1.25 1.245 1.24 vs. Temperature (V =5V) + Reference Voltage VREF-CV (V) REF-ADP 1.235 1.23 -50 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Reference Voltage vs. Temperature Pre-Charge/Quick Charge Block Voltage Gain + vs. Temperature (V =5V, CS1=3.8V, CS2=3.6V) 12.6 Pre-Charge/Quick Charge Block Voltage Gain A (dB) -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) 1.25 Reference Voltage VREF (V) 1.245 1.24 (V =5V, IREF=0mA) + 12.4 12.2 12 11.8 11.6 11.4 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) 1.235 1.23 -50 CHG-SW Block Threshold Voltage 0.8 Threshold Voltage (V) 0.7 0.6 0.5 0.4 0.3 0.2 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) VSW_ON V SW_OFF + vs. Temperature (V =5V) V1 Operating Current vs. Temperature 3 Operating Current ICC (mA) 2.5 2 1.5 1 0.5 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (oC) (V+=5V, CHG-SW:OPEN) -6- Ver.2005-03-09 NJW4120 TYPICAL CHARACTERISTICS LED Pin Saturation Voltage vs. Sink Current TX-SW,PC Pin Saturation Voltage vs. Sink Current (V =5V, Ta=25 C) + o 0.5 Saturation Voltage VOL (V) 0.4 0.3 0.2 (V+=5V, Ta=25oC) 0.5 (V) OL-CNT 0.4 0.3 0.2 TX-SW Saturation Voltage V LED-R 0.1 PC 0.1 LED-G 0 0 10 20 30 Sink Current I SINK 40 (mA) 50 0 0 5 10 15 Sink Current ISINK (mA) Oscillation Cycle vs. Temperature 20 Oscillation Cycle vs. Capacitance Oscillation Cycle OSC1, OSC2 (ms) 100 (V+=5V, Ta=25oC) Oscillation Cycle OSC1, OSC2 (ms) 14 13 12 11 10 9 8 7 6 -50 (V+=5V, C1=C2=0.01F) 10 1 0.001 0.01 Capacitance C1, C2 (F) 0.1 -25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) Ver.2005-03-09 -7- NJW4120 Feature Description 1. Photocoupler Feedback Unit (PC pin, CHG-SW pin, TX-SW pin) NJW4120 feeds back voltage and current information that are required for battery charging via a photocoupler to the primary side of the AC/DC converter, and controls AC/DC converter output. No special method is required if the primary side of the AC/DC converter that is being controlled (whether self excited or externally excited) has circuitry that takes into account the range of output voltage and current that is required for charge control. It also incorporates an adaptor output mode, and extraction of any constant voltage output is possible. The following will switch between charge control and adaptor output. CHG-SW pin, and TDET pin battery set detection are both on: Charge control mode Either CHG-SW pin, or TDET pin battery set detection is off: Adaptor output mode However, if charging is prohibited due to over voltage detection, temperature detection, or the charge over timer, or when there is 2mA of charge, the system will move to adaptor mode. The unit that controls feedback to the photocoupler consists of the ADP voltage control, charge voltage control, and charge current control amps. Each amp controls the photocoupler drive transistor via an OR circuit (Figure 1). Adaptor output To AC/DC converter primary side control RA1 RA2 PC ADP NFB TX-SW CVCC-ON SW transistor PC ADP voltage control CVCC-ON VREF1 (1.24V) To current detection 12dB amp To P-CHG pin To Q-CHG pin To VS pin L CVCC-ON Charge Current control VREF2 CVCC-ON Charge voltage control (2.1V) Pre/Quick charge switch H Figure 1 : Photocoupler Feedback Unit and SW Transistor -8- Ver.2005-03-09 NJW4120 Feature Description (Continued) Amp control and control of the SW transistor connected to the TX-SW pin are not the same in adapter output mode and charge control mode. 1-1. Adapter output mode (ADP pin) In adapter output mode, each of the circuits in the control unit will be in the following state. ADP voltage control amp ON Charge voltage control amp OFF Charge current control amp OFF SW transistor OFF To set the adapter output voltage, use the ADP pin's external resistors RA1, and RA2 and the following formula. VADP = RA1 + RA 2 x VREF-ADP (1.24V) RA 2 In adapter output mode the SW transistor connected to the TX-SW pin will turn OFF, and charge to the battery will be cut off. For this reason, take adapter output voltage from a power supply line that comes before the SW transistor. 1-2.Charge control mode In the case of pre-charge and quick charge each of the circuits in the control unit will be in the following state. ADP voltage control amp OFF Charge voltage control amp ON Charge current control amp ON SW transistor ON However, when there is 2mA of charge, the system will operate in adapter output mode (SW transistor OFF). The SW transistor turns ON, and battery charging will be performed. Charge voltage and charge current operations are described in "2. Voltage Detection Block", and "3. Current Detection Block". Ver.2005-03-09 -9- NJW4120 2. Voltage Detection Block (VS pin) The VS pin determines charge voltage, low voltage, over voltage, and re-charge voltage. Battery voltage conditions are constantly monitored. (Figure 2) 2-1. Charge Voltage (VS pin) Charge voltage VBAT is set using the VS pin external resistors RB1 and RB2 and the following equation: VBAT = RB1 + RB2 x VREF-CV (2.1V) RB2 To OR Circuit CVCC-ON Control Block Quick Charge Detection Recharge Detection Over Voltage Detection Low Voltage 1-cell: RB1 = 2-cell: RB1 = Charge Voltage Control Amp RB1 VREF2 Using the following settings makes it easy to support applications for one or two cells: for one cell, RB1= RB2; for two cells, RB1=3 x RB2. If you use a high resistance, the VS pin's bias current will cause incorrect values. Use as low a resistance as possible. VS RB2 RB2 3xRB2 VBAT x 0.73 Battery Voltage Detection VBAT x 0.95 To Charge VBAT x 1.025 Detection V x 0.525 2-2. Overcharge Detection Block (VS pin) The overcharge detection block stops charging when a Figure 2. Voltage Detection Block Configuration high voltage is detected at the VS pin. The overcharge detection voltage is obtained with the following equation: VOV=VBAT x 1.025 (typ.) When overcharge is detected, charging is prohibited and LED-R blinks. After that, charge will continue to be prohibited, even after battery voltage drops to a normal value. Turning the power off to release UVLO, battery connection detection, or CHG-SW switching will enable the charge sequence to restart. BAT 2-3. Low Voltage Detection (2mA charge) Block (VS pin, CS1 pin) The low voltage detection block detects an over-discharged battery, or an open battery caused by the battery protection circuit or the like. This will determine a 2mA charge prior to pre-charging. The low voltage detection voltage is obtained with the following equation: VLV=VBAT x 0.525 (typ.) During a 2mA charge, the block monitors battery voltage recovery while a steady 2mA current is output from the CS1 pin. (Figure 3) If voltage does not recover within a prescribed time, the timer will prohibit 2mA charging. Turning the power off to release UVLO, battery connection detection, or CHG-SW switching will enable the charge sequence to restart. 2mA Charge Current To Charge Current Control Amp 2mA Charge 12dB CS1 CS2 Rcs Low Voltage Detection Control Block VBAT x 0.525 RB1 VS RB2 To Charge Output Figure 3. 2mA Charging Block 2-4. Re-Charge Detection (VS pin) When a fully charged battery is left for a long period of time, voltage will drop due to self-discharge. The re-charge detection block detects a drop in voltage and re-charges the battery. The re-charge detection voltage is obtained with the following equation. VR-CHG=VBAT x 0.95 (typ.) - 10 - Ver.2005-03-09 NJW4120 FEATURE DESCRIPTION (CONTINUED) 3. Current Detection Block (CS1 pin, CS2 pin) A current detection resistor RCS is inserted between pin CS1 and pin CS2 to monitor battery charge current. The input voltage between pin CS1 and pin CS2 is amplified by the 12dB current detection amp and fed back to the charge current control amp. (Figure 4) 3-1. Pre-Charge Current, Quick Charge Current (P-CHG pin, Q-CHG pin) This will switch between charging with pre-charge current or quick charge current according to the level of the battery voltage VBAT that is input from the VS pin. VBAT x 0.525 to VBAT x 0.73 VBAT x 0.73 to VBAT Pre-charge control Quick charge control Pre-charge and quick charge current values are determined by the P-CHG pin and the Q-CHG pin voltage settings. Settings are made according to the following formulae. VREF Pre-Charge Current Value IP-CHG = ( RP2 x VREF (1.24V) / 4) / RCS RP1 + RP2 CS2 RP1 RP2 RQ1 RQ2 Q-CHG NFB P-CHG Pre-Charge Current Setting IQ-CHG = ( RQ2 x VREF (1.24V) / 4) / RCS RQ1 + RQ2 To OR Circuit Charge Current Control Amp Quick Charge Current Setting 12dB Quick Charge Current Value CS1 CS2 RB1 VS RB2 Rcs 3-2. Full Charge Detection (F-CHG pin) Charge termination is determined by a set full charge current IF-CHG., which is determined by a voltage setting on the F-CHG pin. IF-CHG = (96mV/ 8) / RCS When charging is terminated, LED-G turns on, and the sequence moves to the re-charge detection operation. CVCC-ON To Charge Voltage Control Amp Switch Pre/Quick Charge Current Quick/ Pre-Charge Full Charge Detection Quick Charge Detection 6dB VBAT x 0.73 To Charge Output Control Block Figure 4. Block for Controlling Pre-Charge, Quick Charge, and Block for Detecting Full Charge. Ver.2005-03-09 - 11 - NJW4120 FEATURE DESCRIPTION (CONTINUED) 4. Temperature Detection Block, Battery Connected Detection Block (TDET pin, TH pin, TL pin) The charge temperature range is set with the TL pin (high temperature) and the TH pin (low temperature). The threshold voltage for the temperature detection comparator is set with the external resistors RTHL, RTH, RTL. Therefore, you can select any type of thermistor (NTC) and any charge temperature range (Figure 5). The TL pin and the TH pin are set to go to the potential states shown below for fluctuations in TDET voltage. VTL (high temperature) < VTDET (charge Temperature) < VTH (low temperature) Pin voltages are obtained from the following formulae. TDET pin (thermistor setting) RT VTDET = x VREF(1.24 V ) RTDET + RT TH pin (low temperature setting) RTH + RTL VTH = x VREF(1.24 V ) RTHL + RTH + RTL TL pin (high temperature setting) R TL VTL = x VREF(1.24 V ) R THL + R TH + R TL Charge -ON Battery Connected Detection Low Temperature Detection VREF RTDET RTHL TDET TH TL High Temperature Detection RTH RTL RT VT-TDET=1.15V To CHG-SW To UVLO Lithium Ion Battery Figure 5 Temperature Detection Block When the detected temperature goes out of the range of the set values, charging stops, and LED-R and LED-G turn off. After temperature is restored, charging recommences in line with battery voltage status. The TDET pin is also used for the battery-connected detection feature. The battery-connected detection feature determines that a battery is connected if TDET pin voltage is no greater than 1.15V(typ.), and commences charging. - 12 - Ver.2005-03-09 NJW4120 FEATURE DESCRIPTION (CONTINUED) 5. Delay Circuits (each detection block) Each detection block has a delay circuit and extra features for preventing malfunction due to noise or excess signals. Table 1 Delay Circuits and Extra Features. Detection Block Delay Circuit Low Voltage Malfunction Prevention Circuit CHG-SW Battery Connected Detection Delay I Temperature Detection Full Charge Detection Re-Charge Detection Low Voltage Detection Over Voltage Detection Quick Charge Detection Delay II Extra Feature Hysteresis Hysteresis Hysteresis Hysteresis - - Hysteresis Latch Hysteresis The delay circuit block receives a signal from the timer circuit to fix a delay time. For details on the relationship between the delay time and capacitors see "6. Timer Circuit Block". 6. Timer Circuit Block (C1 pin, C2 pin) OSC1 is used for the timer that is used for pre-charge, 2mA charge and the like. OSC2 is used for the quick charge timer. You can change the time of the timers with external capacitors. Tables 2, 3 show the relationship between capacitance and time. Table 2 C1, C2 Oscillation Cycle t Capacitance (C1, C2) 4700pF 0.01F 0.022F 0.047F Table 3 Timer Time Block Name Oscillation Cycle (OSC1, OSC2) t = 4.7ms t = 10ms t = 22ms t = 47ms Parameter 2mA Charge Timer Pre-Charge Timer LED R Blinking Cycle Delay I Delay II Quick Charge Timer Pre-Charge Timer Quick Charge Timer Calculation Formula 10 tx2 17 tx2 7 tx2 5 tx2 4 tx2 20 tx2 Examples 10.2s 22min. 1.28s 0.32s 0.16s 2hours 55 min. C1=0.01F C2=0.01F Use capacitors the have good temperature characteristics in the OSC block. Capacitor deviation will cause timer errors. Ver.2005-03-09 - 13 - NJW4120 FEATURE DESCRIPTION (CONTINUED) In each charge mode if time-over occurs charging is prohibited and LED-R blinks. Turning the power off to release UVLO, battery connection detection, or CHG-SW switching will enable the charge sequence to restart. NJW4120 incorporates a test mode that shortens the timer block function's test time by 1/150,000. To operate in test mode set the TH pin voltage to a value no greater than that of the TL pin. In test mode, regardless of the external timing capacitors C1, C2, the internal timer clock frequency will operate in a range of approximately 200kHz to 300kHz. The following shows calculation values when the oscillating frequency is 250kHz (4s cycle). Table 4. Timer Times in Test Mode. Block Name Parameter 2mA Charge Timer Pre-Charge Timer LED R Blinking Cycle Delay I Delay II Quick Charge Timer Calculation Formula 10 tx2 17 tx2 7 tx2 5 tx2 4 tx2 20 tx2 Example (t = Appx. 4s) Appx. 4ms Appx. 0.5s Appx. 0.5ms Appx. 0.13ms Appx. 64s Appx. 4.2s Pre-Charge Timer Quick Charge Timer When the TDET pin voltage is approximately 1.2V or greater, the pre-charge / quick charge timers operate normally. If you want to further reduce the test time, setting TDET pin voltage makes it possible to run each of the timer counters divided in half. When the TDET pin is approximately 0.3V or less, the first half of the counter is bypassed. When the voltage is approximately greater than 0.4V and less than 1.1V, the second half of the counter is bypassed. Table 5. Reduced Test Time Mode Parameter Pre-Charge Timer Quick Charge Timer Calculation Formula 8 8 tx2 , tx2 9 10 tx2 , tx2 Example (t =Appx. 4s) Appx. 1ms, Appx. 1ms Appx. 2ms, Appx. 4ms - 14 - Ver.2005-03-09 NJW4120 FEATURE DESCRIPTION (CONTINUED) 7. Reference Voltage Block (VREF pin) This block generates 1.24V and 4.2V reference voltages. The VREF pin outputs 1.24V. In addition to the IC internal reference voltage, this is also used as a reference voltage for charge current setting and temperature detection setting. 8. Power Block, Under Voltage Lockout Circuit (UVLO) Block (V pin, GND pin) An integrated Under Voltage Lockout circuit prevents IC malfunction when power is turned on or off. This circuit incorporates a 200mV hysteresis width to prevent chattering. + As required, insert a bypass capacitor near the IC's V pin when there is power line noise or when wires are long. 9. LED Block (LED-R pin, LED-G pin) The 2 LEDs can indicate charge status. (Figure 5) The LED drive circuit is an open collector output configuration. Therefore, it is easy to set a constant LED drive current with resistance values. The expression for setting the current that flows through the LEDs is shown below. ILED-G (Vcc - VF-LED - VOL-G) / RLED or ILED-R (Vcc - VF-LED - VOL-R) / RLED Input + ILED RLED VF-LED LED-G LED-R Figure 5. LED Drive Circuit Ver.2005-03-09 - 15 - NJW4120 FLOW CHART Start Check Adapter Voltage V+>2.4V YES Check Battery Connection CHG-SW Pin=GND YES Check Battery Connection VTDET<1.15V YES Check Battery Temp. VTL NO Abnormal Charging Prohibited LED-G: OFF LED-R: OFF TX-SW:OFF NO Adaptor voltage, Battery connection, Battery Temp. and Battery voltage are monitored during charging. NO NO NO NO Quick Charge Timer Start Pre-Charge Timer Start LED-G: OFF LED-R: ON 2mA Charge: ON Quick Charge Start LED-G: OFF LED-R: ON TX-SW:ON YES YES Time Out Time Out NO NO NO Check Full Charge IBAT YES Time Out Check Battery Voltage VBAT - 16 - Ver.2005-03-09 NJW4120 TIMING CHART Charge Control Mode Adaptor Output Mode Adaptor Voltage 0V Charge Control Voltage Re-Charge Detecting Voltage Battery Voltage 0V PreCharge Quick Charge Quick Charge Detecting Voltage Constant Voltage Charge Full Charge ReCharge Quick Charge Current Charge Current Pre-Charge Current Full Charge Current TX-SW OFF ON OFF ON CHG-SW OFF ON LED-R OFF ON OFF ON LED-G OFF ON OFF The timing chart at the time of protection circuit operation In addition to a charge timing chart, a protection circuit with a built-in IC operates according to the state and circumference environment of a battery. The timing chart when various protection circuits operate is as follows. Pre-charge time out Quick charge time out Adaptor Voltage Adaptor Voltage 0V Battery Voltage Quick charge detecting voltage 0V Charge Voltage Battery Voltage 0V Pre-charge ! 22min* " 0V Quick charge ! 3h* " Charge Current 60mA* Full charge detection Charge Current TX-SW OFF ON OFF TX-SW OFF ON OFF CHG-SW OFF ON CHG-SW OFF ON LED-R OFF ON ON/OFF 1.28s* LED-R OFF ON ON/OFF LED-G OFF C1=0.01F LED-G OFF C2=0.01F Ver.2005-03-09 - 17 - NJW4120 The timing chart at the time of protection circuit operation (Continued) Over voltage battery (Return) Adaptor voltage Charge voltage 0V Battery voltage Low voltage Detecting voltage 0V Charge Current 2mA Pre-charge 2mAcharge ! 10s* " 0V Battery voltage Low voltage Detecting voltage 0V Charge Current 2mAcharge ! 10s* " Charge STOP Over voltage battery(Abnormalities) Adaptor voltage 2mA TX-SW OFF ON TX-SW OFF CHG-SW OFF ON CHG-SW OFF ON LED-R OFF ON LED-R OFF ON ON/OFF 1.28s* LED-G OFF C1=0.01F LED-G OFF C1=0.01F Over charge battery Adaptor Voltage Abnormalities in temperature Adaptor Voltage 0V 0V Battery Voltage 0V Charge Current Over charge detecting Battery Voltage 0V Charge Current Charge STOP Charge STOP TX-SW OFF TX-SW OFF CHG-SW OFF ON CHG-SW OFF ON LED-R OFF ON/OFF 1.28s* LED-R OFF LED-G OFF C1=0.01F LED-G OFF Temperature Detecting ON - 18 - Ver.2005-03-09 NJW4120 OPERATION MATRIX Adaptor Mode Quick Charge OFF ON ON Charge Q-CHG Operate Operate Operate Operate Operate Operate PreCharge OFF ON ON Adaptor P-CHG Operate Operate Operate Operate Operate Operate 2mA Charge OFF ON OFF Adaptor 2mA Operate Operate Operate Operate Operate Disregard Full Charge ON OFF OFF Adaptor Re-Charge Stop Operate Operate Operate Operate Temperature Error OFF OFF OFF Adaptor Auto Stop Operate Re-start Re-start Disregard Over Voltage Time OUT Error OFF OFF BLINKING BLINKING OFF OFF Adaptor Adaptor Latch Latch Stop Operate Re-start Re-start Disregard Operate Operate Re-start Re-start Disregard Parameter LED-G OFF LED-R OFF SW-Tr. OFF Control Mode Adaptor Charge Current Return Charge Timer Stop Temperature Disregard Detecting Over Voltage Disregard Detecting CHG-SW Stay Battery Setting Stay Full Charge Disregard Detecting Disregard: Detection function is not reflected in control although it is operating. LED ON/OFF PATTERN Parameter Adaptor Voltage Charging Full Charging Temperature Error Over Voltage Detecting Time Out *Available upon request. NJW4120 LED-R LED-G OFF OFF ON OFF OFF ON OFF OFF BLINKING OFF BLINKING OFF NJW4125* LED-R LED-G OFF OFF ON OFF OFF ON BLINKING OFF BLINKING OFF BLINKING OFF NJW4126* LED-R LED-G ON OFF BLINKING ON ON ON OFF OFF BLINKING OFF BLINKING OFF NJW4127* LED-R LED-G ON OFF BLINKING ON ON ON BLINKING OFF BLINKING OFF BLINKING OFF Ver.2005-03-09 - 19 - NJW4120 MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. - 20 - Ver.2005-03-09 |
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