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AMC7140
www.addmtek.com
700mA HIGH VOLTAGE ADJUSTABLE CURRENT REGULATOR WITH ENABLE CONTROL
FEATURES 0.5V Output Drop-out Voltage at 700mA. 700mA Maximum Output Current. Output Current Controlled by External Resistor. 3us Fast Response Output Stage Enable Control. Output Driving Voltage Up To 75V. Supply Voltage Range 5V~50V TO-252-5L package
DESCRIPTION The AMC7140 is a high voltage, low drop-out current regulator for maximum output current up to 700mA. The output current was decided by external resistor. The output sink current could be disabled via OE pin Build-in thermal protection to prevent the chip over heat damage.
TYPICAL APPLICATION CIRCUIT
APPLICATIONS High Power LED Driver RGB Full Color Power LED driver LCD Monitor/TV LED backlight Driver LED Table Lamp
5V~50V CBP
PACKAGE PIN OUT
VDD Enable OE
AMC7140
ISET RSET GND OUT
5 4 3 2 1
TO-252-5L (Top View)
OUT OE GND ISET VDD
ORDER INFORMATION
DL
Note:
TO-252 5 pin AMC7140DLFT (Lead Free)
All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. AMC7140DLFT). The letter "F" is marked for Lead Free process.
Copyright (c) 2007 ADDtek Corp.
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AMC7140
ABSOLUTE MAXIMUM RATINGS Input Voltage, VDD Output Voltage, VOUT Maximum Operating Junction Temperature, TJ Storage Temperature Range Lead Temperature (soldering, 10 seconds)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of the specified terminal. (Note)
50V 75V 150C -65C to 150C 260C
PIN DESCRIPTION Pin Name OUT OE ISET VDD GND Pin Function Output pin. Sink current is decided by the current on RSET connected to ISET. IOUT = 500 x ISET. Output stage enable control pin. High enable the OUT pin. Output current set input. Connect a resistor from ISET to GND to set the LED bias current. ISET = 1.2V/RSET. Power supply. Ground
THERMAL DATA Thermal Resistance from Junction to Ambient, JA
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. Connect the ground pin to ground using a large pad or ground plane for better heat dissipation. All of the above assume no ambient airflow. Maximum Power Calculation: PD(MAX)= TJ(MAX) - TA(MAX) JA TJ(OC): TA(OC): Maximum recommended junction temperature Ambient temperature of the application
80 OC /W
JA(OC /W): Junction-to-Ambient temperature thermal resistance of the package, and other heat dissipating materials. The maximum power dissipation for a single-output regulator is: PD(MAX) = [(VIN(MAX) - VOUT(NOM))] x IOUT(NOM) + VIN(MAX) x IQ Where: VOUT(NOM) = the nominal output voltage IOUT(NOM) = the nominal output current, and IQ = the quiescent current the regulator consumes at IOUT(MAX) VIN(MAX) = the maximum input voltage JA = (+150 OC - TA)/PD
Then
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RECOMMENDED OPERATING CONDITIONS Symbol Min Typ Supply Voltage VDD 5 Output Sink Current IOUT Operating free-air temperature range Ta -40 Parameter Max 50 700 +85 Unit V mA
DC ELECTRICAL CHARACTERISTICS VDD=24V, Ta=25C, No Load, (Unless otherwise noted) Parameter Output Current Output Current Deviation SET Current Range Maximum Output Current Output Drop-out Voltage* Thermal Shut-down Junction Temperature "Low" Input Voltage "High" Input Voltage "Low" Input Current "High" Input Current Output Enable Delay Time Output Disable Delay Time Supply Current Consumption
Note1: Output dropout voltage: 90% x IOUT @ VOUT=500mV
Condition VOUT=0.5V, RSET=4K VOUT=0.5V, RSET=1.2K VOUT=0.5V, RSET=4K VOUT=0.5V, RSET=1.2K
Min
Typ 150 500
Max
Unit mA
5 5 200 1400 700 0.35 160 0 2 -20 -5.0 0.8 12 +20 +5.0 3 3 5
% A mA V V V A A S S mA
ISET=1400uA ISET=1000uA, Note 1 Hysteresis 20
OE from Low to High, VOUT=0.5V, IOUT=350mA, 50% OE from High to Low, VOUT =0.5V, IOUT=350mA, 50%
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CHARACTERIZATION CURVES
Supply Current vs. Supply Voltage
5 Supply Current (mA) 4 3 2 1 0 0 20 40 Supply Voltage (V) V DROP =0.5V TA =25C 60 IOUT =700mA
ISET Voltage vs. Junction Temperature
1.50 1.40 1.30 1.20 1.10 V DD=24V 1.00 -50 0 50 100 150
IOUT =500mA
ISET Voltage (V)
Junction Temperature (C)
Output Current vs. Supply Voltage
600 500 Output Current (mA) 400 300 200 100 0 0 20 40 Supply Voltage (V) IOUT =150mA V DROP =0.5V TA =25C 60 Output Current (mA) IOUT =500mA 500.0 400.0 300.0 200.0 100.0
Output Current vs. Dropout Voltage
IOUT =340mA
IOUT =150mA V DD=24V TA=25C 1.00 2.00 3.00
0.0 0.00
Dropout Voltage (V)
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APPLICATION INFORMATION AMC7140 is a high voltage, low dropout current regulator for maximum output current up to 700mA with OE pin. The current could be linearly adjusted through variable resister connected to ISET pin, or by PWM control via OE pin. Although the absolute maximum rating of OUT pin 60V, the dropout voltage between OUT pin and GND pin should not be too large when current is sinking because of the heat dissipation capability of the package. Here are some of the typical application examples: DC Voltage Input: Any DC voltage level between 5V to 50V could be adopted as power source VDD for typical application of AMC7140 as long as VDD is larger than the total forward voltage drop of the LED string (at expecting current) by 0.35V. If 50V ~ 60V voltage level is adopted as power source to positive end of the LED string, one Zener shunt regulator could be used to provide appropriate voltage to VDD pin.
50VDC
50VDC
RZ CIN
VDD Enable OE ISET CIN RSET1
OUT
VDD Enable OE ISET DZ RSET1
OUT
AMC7140
GND
AMC7140
GND
RSET2
880
RSET2
880
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AMC7140
LED Backlight Solution: AMC7140 could coordinate with any type of DC-to-DC converter through feedback path to realized LED backlight module. The number of LEDs in the string is variable even with certain fixed power source since the output voltage of the DC-to-DC converter could be modulated according to feedback signal.
1 2V DC o r 2 4V DC DC / DC C o n v e rte r FB O u tp u t
Db
Rb VDD E n a b le OE IS E T R SET1 OUT
AM C7140
GND
R SET2
880
AC Voltage Input: AMC7140 could work with any kind of well-known or well-developed switch-mode power supply system. Simply cut off the internal feedback path of the power supply system and then feed the signal from AMC7140 back to the power supply system instead.
85VAC ~ 265 VAC VDD Power Supply FB Rb
Db
VDD Enable OE ISET RSET1
OUT
AMC7140
GND
RSET2
880
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THERMAL CONSIDERATION The Maximum Power Dissipation on Current Regulator: PD(MAX) = VOUT(MAX) x IOUT(NOM) + VIN(MAX) x IDD VOUT(MAX) = the maximum voltage on output pin; IOUT(NOM) = the nominal output current; IDD = the quiescent current the regulator consumes at IOUT(NOM); VIN(MAX) = the maximum input voltage. Thermal Consideration: The AMC7140 has internal power and thermal limiting circuitry designed to protect the device under overload conditions. However, maximum junction temperature ratings should not be exceeded under continuous normal load conditions. The thermal protection circuit of AMC7140 prevents the device from damage due to excessive power dissipation. When the device junction temperature rises to approximately 150C, the regulator will be turned off. When power consumption is over about 1000mW (TO-252 package, at TA=70C), additional heat sink is required to control the junction temperature below 125C. The junction temperature is: TJ = PD (JT +CS +SA ) + TA PD : Dissipated power. JT: Thermal resistance from the junction to the mounting tab of the package. For TO-252 package, JT = 7.0 oC /W. CS: Thermal resistance through the interface between the IC and the surface on which it is mounted. (typically, CS < 1.0C /W) SA: Thermal resistance from the mounting surface to ambient (thermal resistance of the heat sink). If PC Board copper is going to be used as a heat sink, below table can be used to determine the appropriate size of copper foil required. For multi-layered PCB, these layers can also be used as a heat sink. They can be connected with several through-hole vias. PCB SA (C /W) PCB heat sink size (mm )
2
59 500
45 1000
38 1500
33 2000
27 3000
24 4000
21 5000
Recommended figure of PCB area used as a heat sink. Heat-pad of TO-252 5 4 3 2 1 Through hole vias
OUT OE GND ISET VDD
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PACKAGE
TO-252-5L
Symbol A A1 B C c1 D D1 E E e1 L1 L2 L3 V
Dimensions in Millimeters MIN 2.200 0.000 0.400 0.430 0.430 6.350 5.200 5.400 1.270 TYP 2.540 TYP 9.500 1.400 2.550 3.800 REF 9.900 1.780 2.900 MAX 2.400 0.127 0.600 0.580 0.580 6.650 5.400 5.700
Dimensions in Inches MIN 0.087 0.000 0.016 0.017 0.017 0.250 0.205 0.213 0.050 TYP 1.000 TYP 0.374 0.055 0.100 0.150 REF 0.390 0.070 0.114 MAX 0.094 0.005 0.024 0.023 0.023 0.262 0.213 0.224
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IMPORTANT NOTICE
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of its products to the specifications applicable at the time of sale.
ADDtek Corp. 9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105 TEL: 2-25700299 FAX: 2-25700196
Copyright (c) 2007 ADDtek Corp.
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