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| FA7611CP(E) FA7611CP(E) s Description The FA7611CP(E) is a bipolar IC containing basic circuit necessary for PWM-type switching power supply control. Bipolar IC For Switching Power Supply Control s Dimensions, mm SSOP-16 16 9 s Features * Low-voltage operation (VCC = 3.6 to 22V) * Predrivers: Totem-pole output or open-collector for CH1 and open-collector output for CH2 * Latch-mode short-circuit protection function (no malfunction due to electrical noise) * soft-start function * Undervoltage lock-out function * One capacitor shared for short circuit protection and for soft start to minimize the number of external discrete components 5.3 7.90.3 1 0.10.1 6.2 +0.1 8 0.2 -0.05 0~10 s Applications * Battery power supply for portable equipment 0.6 0.3 0.65 DIP-16 16 9 1 0.81 19.4 1.5 8 3.1min 4.3max 0.2min 3.4 6.5 .0 0.3 -0 +0.1 5 7.6 2.540.25 0.50.1 0~15 0~1 5 s Block diagram Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Pin symbol Description Oscillator timing capacitor Capacitor for soft-start, shortcircuit protection and delay Dead time adjustment Non-inverting input to error amplifier Inverting input to error amplifier Error amplifier output Ground CH. 2 Output Power supply CH. 1 Current limiting resistor CH. 1 Output Error amplifier output Inverting input to error amplifier Non-inverting input to error amplifier Reference voltage (0.5V) Dead time adjustment Reference voltage output (2.5V) CT CS DT2 IN2 (+) IN2 (-) FB2 GND OUT2 VCC OUT1R OUT1 FB1 IN1 (-) IN1 (+) 15 16 DT1 REF 1 2.1max FA7611CP(E) s Absolute maximum ratings Item Supply voltage Reference voltage output current Output current Total power dissipation Operating temperature Storage temperature Symbol Rating 22 5 50 400 -20 to +85 -40 to +150 Unit V mA mA mW C C s Recommended operating conditions Item Supply voltage Feedback resistance Oscillator timing capacitor Oscillator timing resistance Oscillation frequency Symbol Min. 3.6 100 220 10 5 22,000 100 200 Max. 20 Unit V k pF k kHz VCC IOR IO Pd Topr Tstg VCC RNF CT RT fOSC s Electrical characteristics (Ta = 25C, VCC = 6V, RT = 33k, CT = 1000pF) Reference voltage section Item Output voltage Line regulation Load regulation Output voltage variation due to temperature change Symbol Test condition Min. Typ. 2.475 4 1 Max. 2.525 12 6 1 1 Unit V mV mV % % VREF LINE LOAD VTC1 VTC2 IOR = 1mA 2.425 VCC = 3.6 to 20V, IOR =1mA IOR = 0.1 to 1mA Ta = -20 to +25C Ta = +25 to +85C -1 -1 Oscillator section Item Oscillation frequency Frequency variation 1 (due to supply voltage change) Frequency variation 2 (due to temperature change) Symbol Test condition Min. 95 Typ. 115 1 5 Max. 135 Unit kHz % % fOSC fdV fdT CT = 1000pF, RT = 33k VCC = 3.6 to 20V Ta = -20 to +85C Error amplifier section Item Reference voltage Input bias current Open-loop voltage gain Unity-gain bandwidth Maximum output voltage (Pin 6 and Pin 12) Symbol Test condition Min. 0.484 Typ. 0.494 5 70 0.6 RNF = 100k Max. 0.504 100 Unit V nA dB MHz V 200 40 85 200 mV VB IB AV GB VOM+ VOM- IOM+ VREF-0.2 RNF = 100k VOM = 1V Output source current (Pin 6 and Pin 12) A PWM comparator section Item Input threshold voltage (Pin 6 and Pin 12) Input threshold voltage (Pin 6 and Pin 12) Symbol Test condition Duty cycle = 0% Duty cycle = 50% Min. Typ. 0.85 1.1 Max. 0.95 Unit V V VTH0 VTH50 2 FA7611CP(E) Dead time adjustment circuit section Item Input bias current (Pin 3 and Pin 15) Input threshold voltage (Pin 3 and Pin 15) Input threshold voltage (Pin 3 and Pin 15) Symbol Test condition Duty cycle = 0% Duty cycle = 50% Min. Typ. 80 0.22 0.46 Max. 300 0.32 Unit nA V V IBDT VTH DT0 VTH DT50 Short-circuit protection circuit section Item Input threshold voltage (Pin 6 and Pin 12) Charge current (Pin 2) Latch-mode threshold voltage (Pin 2) Symbol Test condition Min. 1.20 Pin 2 = 0V, Pin 6, Pin 12 = 2V 10 1.20 Typ. 1.50 30 1.50 Max. 1.80 50 1.80 Unit V VTH PC ICHG VTH LA A V Undervoltage lockout circuit section Item OFF-to-ON threshold voltage ON-to-OFF threshold voltage Voltage hysteresis Symbol Test condition Min. Typ. 2.65 2.60 50 Max. Unit V V mV VTH ON VTH OFF VHYS Output section Item CH. 1 H-level output voltage (Pin 11) CH. 1 L-level output voltage (Pin 11) CH. 1 Output source current (Pin11) CH. 2 L-level output voltage (Pin 8) Symbol Test condition Min. 3.5 8 Typ. 4.0 0.25 11 1.0 1.5 0.65 Max. Unit V V mA V V01H V01L ISOURCE1 V02L RL = 10k Output sink current = 20mA ROUT1 = 470 (Pin 11) = 0V Output sink current = 20mA Overall device Item Supply current Operating-state supply current Symbol Test condition Latch mode Min. Typ. 2.0 3.5 Max. 3.0 6.0 Unit mA mA ICC LA ICC AV RL = Duty cycle = 50% 3 FA7611CP(E) s Characteristic curves (Ta = 25C) Oscillation frequency (fOSC) vs. timing capacitor capacitance (CT) Output duty cycle vs. CS terminal voltage (VCS) Output duty cycle vs. DT terminal voltage (VDT) Output duty cycle vs. FB terminal voltage (VFB) CH-1 output source current (ISOURCE1) vs. supply voltage (VCC) L-level output voltage (VO1L) vs. CH. 1 output sink current (ISINK1) 4 FA7611CP(E) L-level output voltage (VO2L) vs. CH. 2 output sink current (ISINK2) Supply current (ICC) vs. supply voltage(VCC) Operating-state supply current (ICCAV) vs. oscillation frequency (fOSC) Error amplifie frequency (f) vs. valtage gain (AV) / phase () 5 Phase [deg] FA7611CP(E) s Application circuit Flyback-transformer type and chopper type buck converter circuit VCC 3.3k 63.5k + - C1 TR D10 + - C11 Flyback 24V 10V 1k 100k 22000p 22k 0.01 Rout1 + - C2 D12 - + C13 Q1 -10V D11 + - C12 VCC 1M 16 15 14 13 12 11 10 9 REF DT1 IN1(+) IN1(-) FB1 OUT1 OUT1R VCC FA7611CP(E) CT 1 CS 2 DT2 IN2(+)IN2(-) FB2 3 4 5 1M 6 GND OUT2 7 8 Q2 R21 L2 Buck 5V C20 + - 56k 1000p 4.7 330k 0.01 R20 D20 820k 1k 2.2k 20.07k Chopper type buck converter and inverting converter circuit 3.3k 30.1k L1 1k Rout1 R11 D10 + - C10 Q1 Buck 5V 0.01 22000p VCC 16 15 REF DT1 14 IN1(+) 13 IN1(-) 12 FB1 11 OUT1 10 OUT1R 9 VCC + - C1 VCC FA7611CP(E) CT 1 56k CS 2 DT2 3 IN2(+) 4 IN2(-) 5 FB2 6 GND 7 OUT2 8 R21 R20 Q2 + - C2 330k 1000p + 4.7 - D20 47000p Inverting -5V L2 - + C20 820k 1k 100k 2.2k 5.02k 22k Parts tolerances characteristics are not defined in the circuit design sample shown above. When designing an actual circuit for a product, you must determine parts tolerances and characteristics for safe and economical operation. Please connect a capacitor, which the value is about 0.01F to 0.1F, between VCC and REF terminals in order to prevent from irregular output pulse at start-up. 6 |
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