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| Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Description The MIK34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step-Down and Step-Up and VoltageInverting applications with a minimum number of external components. * * * * * * * Features Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference Pin connections Schematic Diagram Driver Collector 8 S R Q Q2 Q1 100 1 Switch Collector Ipk Sense 7 Ipk C Oscillator T Comparator 2 3 Switch Emitter Timing Capacitor Comparator Inverting Input 5 Absolute Maximum Ratings Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW TJ TA Tstg Parameter Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPIN1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1) Switch Current Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Maximum 40 -0.3 to +40 40 40 40 40 100 1.5 +150 0 to +70 -65 to +150 Units Vdc Vdc Vdc Vdc Vdc Vdc mA A C C C + VCC 6 1.25 V Reference 4 - Gnd Page 1 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Electrical characteristics (Vcc = 5.0 V, TA = Tlow to Thigh , unless otherwise specified.) Characteristics OSCILLATOR Frequency (Vpin5 = 0V, CT = 1.0 nF, TA = 25C) Charge Current(VCC = 5.0V to 40V, TA = 25C) Discharge Current (VCC = 5.0V to 40V, TA = 25C) Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25C) Current Limit Sense Voltage (Ichg = Idischg, TA = 25C) OUTPUT SWITCH (NOTE 2) Saturation Voltage, Darlington Connection (ISW = 1.0 A, Pins 1, 8 connected) Saturation Voltage, Darlington Connection (ISW = 1.0 A, Rpin 8 = 82 to VCC , Forced 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25C) Collector Off-State Current (VCE = 40 V) Symbol fOSC Ichg Idischg Idischg / Ichg Vipk(sence) VCE(sat) VCE(sat) hFE IC(off) Min 24 24 140 5.2 250 - - 50 - Typ 33 35 220 6.5 300 1.0 0.45 75 40 Max 42 42 260 7.5 350 1.3 0.7 - 100 Units kHz A A - mV V V - A COMPARATOR Threshold Voltage Vth V (TA=25C) 1.225 1.25 1.275 (TA =Tlow to Thigh) 1.21 - 1.29 mV 5.0 1.4 - Threshold Voltage Line Regulation Regline (Vcc=3.0 V to 40 V) IIB Input Bias Current - -20 -400 nA (Vin=0 V) TOTAL DEVICE - - 4.0 mA ICC Supply Current (Vcc = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC, Vpin 5 > Vth, Pin 2 = Gnd, remaining pins open) Note1: Maximum package power dissipation limits must be observed. Note2: Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. Page 2 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Typical Performance Characteristics 1000 500 ton-off , OUTPUT SWIT ON-OFF TIME (s) CH 200 100 50 fon 20 10 5.0 foff OR AGE (V) VOSC , OSCILLAT VOLT VCC = 5.0 V P 7 = VCC in P 5 = Gnd in O T = 25 C A 2.0 1.0 0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10.0 VCC = 5.0V Pin 7 = VCC Pin 2 = Gnd Pins 1, 5,8 = Open CT = 1.0 nF O T = 25 C A C T, OSCILLAT T OR IMING CAP ACIT OR (nF) 10 s/DIV Figure 1. Output Switch On-Off Time versus Oscillator Timing Capacitor. Figure 2. Timing Capacitor Waveform. Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current. Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current. Figure 5. Current Limit Sense Voltage versus Temperature. Figure 6. Standby Supply Current versus Supply Voltage. Page 3 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Application Information Figure 1. Step-Up Converter. Note: R to 0 for constant Vin Figure 2a. External NPN Switch. Figure 2b. External NPN Saturated Switch. Figure 2. External Current Boost Connections for IC Peak Greater than 1.5 A. Page 4 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Figure 3. Step-Down Converter. Figure 4a. External NPN Switch. Figure 4b. External PNP Suturated Switch. Figure 4. External Current Boost Connections for IC Peak Greater than 1.5 A. Page 5 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Figure 5. Voltage Inverting Converter. Figure 6a. External NPN Switch. Figure 6b. External PNP Saturated Switch. Figure 6. External Current Boost Connections for IC Peak Greater than 1.5 A. Page 6 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Design Formula Table Calculation Step-Up Step-Down Voltage-Inverting ton/toff Vout + VF - Vin (min) Vin (min) - Vsat 1 Vout + V F Vin (min) - Vsat - Vout 1 Vout + VF Vin + Vsat 1 (ton+toff)max CT lpk(switch) RSC L(min) CO f min f min f min 4.0 x 10-5 ton t 2 I out (max) on + 1 t off 4.0x10-5 ton 4.0 x 10-5 ton t 2 I out (max) on + 1 t off 2 I out (max) 0.3/lpk(switch) V in (min) - V sat - V out I pk ( switch ) x t on (max) 0.3/lpk(switch) Vin (min) - Vsat I pk ( switch ) x ton (max) 0.3/lpk(switch) V in (min) - V sat I pk ( switch ) x t on (max) 9 I out ton Vripple ( pp ) I pk ( switch ) ( ton + toff ) 8Vripple ( pp ) 9 I out ton Vripple ( pp ) TERMS AND DEFINITIONS Saturation voltage of the output switch. Vsat VF Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: R Vout = 1.251 + 2 R 1 Vin Nominal input voltage. Desired output voltage, Vout Desired output current. Iout fmin Minimum desired output switching frequency at the selected values of Vin and IO. Vripple(p-p) -Desired peack-to-peack output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. Page 7 of 8 Replacement of MC34063A MIK34063A DC-to-DC Converter Control Circuits October 1997 - revised November 1999 Pad Location MIK 34063A Pad N 1 2 3 4 5 6 7 8 Pad name Switch Collector Switch Emitter Timing Capacitor Gnd Comparator Inverting Input VCC Ipk Sence Driver Collector Chip size: 1.95 x 2.0 mm Pad Location MIK 34063A (new design) Chip size: 1.72 x 1.82 mm Pad N 1 2 3 Pad name Switch Collector (Note 1) Switch Emitter (Note 1) Timing Capacitor 4 Gnd 5 Comparator Inverting Input 6 VCC 7 Ipk Sence 8 Driver Collector Note 1: Two wires must be connected to 1 and 2 pin. Page 8 of 8 |
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