Bipolar IC For Switching Power Supply Control FA7615CP(E) FA7615CP(E) ■ Description ■ Dimensions, mm The FA7615CP(E) is a bipolar IC containing basic circuit necessary for PWM-type switching power supply control. This IC can be operated by external synchronizing pulses. Á SSOP-16 9 16 ■ Features 0.2 –0.05 ■ Applications • Battery power supply for portable equipment 0.3 0.65 2.1max +0.1 8 6.2 0~10˚ 1 0.1±0.1 External synchronization input terminal Low-voltage operation (VCC = 3.6 to 22V) Totem-pole predriver Latch-mode short-circuit protection function (no malfunction due to electrical noise) • One capacitor shared for short-circuit protection and for softstart to minimize the number of external discrete components 5.3 7.9±0.3 • • • • 0.6 Á DIP-16 16 6.5 9 8 19.4 1.5 0.2min 3.4 0.81 0.5±0.1 2.54±0.25 3.1min 4.3max 1 +0.1 5 .0 0.3 –0 7.6 0~15 ˚ 5˚ 0~1 ■ Block diagram Pin No. Pin symbol Description 1 CT CS Oscillator timing capacitor DT2 IN2 (+) Dead time adjustment IN2 (–) FB2 GND OUT2 VCC Inverting input to error amplifier CH. 1 Current limiting resistor 14 OUT1R OUT1 FB1 IN1 (–) DT1 15 SYNC External synchronization input 16 REF Reference voltage output (2.5V) 2 3 4 5 6 7 8 9 10 11 12 13 Capacitor for soft-start, short-circuit protection and delay Non-inverting input to error amplifier Error amplifier output Ground CH. 2 Output Power supply CH. 1 Output Error amplifier output Inverting input to error amplifier Dead time adjustment 1 FA7615CP(E) ■ Absolute maximum ratings Item Symbol VCC Reference voltage output current IOR Output current IO Total power dissipation Pd Supply voltage Operating temperature Storage temperature Topr Tstg ■ Recommended operating conditions Rating Unit Item Symbol Min. Max. Unit 22 V Supply voltage 3.6 20 V 5 mA Feedback resistance ±50 mA Oscillator timing capacitor 400 mW Oscillator timing resistance VCC RNF CT RT –20 to +85 °C Oscillation frequency fOSC –40 to +150 °C 100 kΩ 220 22,000 pF 10 100 kΩ 5 200 kHz ■ Electrical characteristics (Ta = 25°C, VCC = 6V, RT = 47kΩ, CT = 1000pF) Reference voltage section Item Symbol Test condition Output voltage VREF LINE LOAD VTC1 IOR = 1mA 2.383 VCC = 3.6 to 20V, IOR = 1mA IOR = 0.1 to 1mA Ta = –20 to +25°C VTC2 Ta = +25 to +85°C Item Symbol Test condition Min. Oscillation frequency fOSC fdV CT = 1000pF, RT = 47kΩ VCC = 3.6 to 20V 17 fdT ISYNC VSYNC Ta = –20 to +85°C 5 VSYNC = 2V 0.4 Item Symbol Test condition Reference voltage VB IB AV GB Line regulation Load regulation Output voltage variation due to temperature change Min. Typ. Max. Unit 2.432 2.481 V 4 12 mV 1 6 mV –1 1 % –1 1 % Typ. Max. Unit 20 23 kHz Oscillator section Frequency variation 1 (due to supply voltage change) Frequency variation 2 (due to temperature change) Synchronizing terminal input current Synchronizing terminal input voltage 1 1 % % 1.0 mA 2.5 V Error amplifier section Input bias current Open-loop voltage gain Unity-gain bandwidth Min. Typ. Max. Unit 0.484 0.494 0.504 V 5 100 70 1.0 VOM+ VOM– IOM+ RNF = 100kΩ RNF = 100kΩ VOM = 1V 40 Item Symbol Test condition Min. Input threshold voltage (Pin 6 and Pin 12) VTH0 VTH50 Maximum output voltage (Pin 6 and Pin 12) Output source current (Pin 6 and Pin 12) nA dB MHz VREF–0.2 V 200 mV 85 200 µA Typ. Max. Unit Duty cycle = 0% 0.38 0.48 Duty cycle = 50% 0.6 PWM comparator section Input threshold voltage (Pin 6 and Pin 12) 2 V V FA7615CP(E) Dead time adjustment circuit section Item Symbol Input bias current (Pin 3 and Pin 14) IBDT VTH DT0 VTH DT50 Item Symbol Test condition Input threshold voltage (Pin 6 and Pin 12) VTH PC ICHG VTH LA Pin 2 = 0V, Pin 6, Pin 12 = 2V 18 Item Symbol Test condition OFF-to-ON threshold voltage VTH ON VTH OFF VHYS Input threshold voltage (Pin 3 and Pin 14) Input threshold voltage (Pin 3 and Pin 14) Test condition Min. Typ. Max. Unit 80 300 nA Duty cycle = 0% 0.38 0.48 Duty cycle = 50% 0.60 V V Short-circuit protection circuit section Charge current (Pin 2) Latch-mode threshold voltage (Pin 2) Min. Typ. Max. Unit 1.60 1.80 2.00 V 30 42 µA 1.60 1.80 2.00 V Min. Typ. Max. Unit Undervoltage lockout section ON-to-OFF threshold voltage Voltage hysteresis 2.65 V 2.60 V 50 mV Output section Item Output saturation voltage H-level (CH.1) Symbol Test condition VO1H Output source current = 20mA Output sink current = 20mA L-level (Common to CH.1 and CH.2) VO1L/2L Min. Typ. Max. Unit 0.3 0.8 V 0.3 0.8 V ISOURCE1 ISOURCE2 Pin 11 = 0V 6 11 15 mA VCC = 16V, Pin 8 = 0V 19 27 36 mA Item Symbol Test condition Min. Typ. Max. Unit Supply current ICC LA ICC AV Latch mode 2.0 3.0 mA RL = ∞ Duty cycle = 50% 3.5 6.0 mA CH. 1 Output source current (Pin 11) CH. 2 Output source current (Pin 8) Overall device Operating-state supply current 3 FA7615CP(E) ■ Characteristic curves (Ta = 25°C) Output duty cycle vs. CS terminal voltage (VCS) Output duty cycle vs. DT terminal voltage (VDT) Output duty cycle vs. FB terminal voltage (VFB) H-level output saturation voltage (VO1H) vs. CH. 1 output source current (ISOURCE1) CH-2 output source current (ISOURCE2) vs. supply voltage (VCC) VO1H [V] Oscillation frequency (fOSC) vs. timing resistor resistance (RT) ISOURCE [mA] 4 FA7615CP(E) L-level output voltage (VOL ) vs. output sink current (ISINK) Supply current (ICC ) vs. supply voltage (VCC) AV[dB] Phase θ [deg] Error amplifier frequency (f) vs. voltage gain (AV)/phase (θ) f [Hz] 5 FA7615CP(E) ■ Application circuit Á Flyback-transformer type and chopper type boost converter circuit 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 0.01µF to 0.1µF, between VCC and REF terminals in order to prevent from irregular output pulse at start-up. 6