Bipolar IC For Switching Power Supply Control FA7613CP(E) FA7613CP(E) ■ Description ■ Dimensions, mm The FA7613CP(E) is a bipolar IC containing basic circuit necessary for PWM-type switching power supply control. The supply voltage range is from 2.5V. Á SSOP-16 9 16 0.3 0.2 –0.05 0.65 2.1max +0.1 8 6.2 0~10˚ ■ Applications 1 0.1±0.1 • Low-voltage operation (VCC = 2.5 to 22V) • Open collector output • Latch-mode short-circuit protection function (no malfunction due to electrical noise) • Soft-strat function • Output ON/OFF control function • Low standby current (Max. 10µA) • Not many external discrete components needed 5.3 7.9±0.3 ■ Features 0.6 • Battery power supply for portable equipment Á DIP-16 16 6.5 9 8 19.4 1.5 0.2min 3.4 0.81 3.1min 4.3max 1 7.6 0.5±0.1 2.54±0.25 +0.1 5 .0 0.3 –0 0~15 ˚ 5˚ 0~1 ■ Block diagram Pin No. Pin symbol Description 1 NC REF IN (+) — IN (–) FB DT GND NC Inverting input to error amplifier — 12 NC OUT VCC SCP 13 CT Oscillator timing capacitor 14 RT ON/OFF NC Oscillator timing resistance 2 3 4 5 6 7 8 9 10 11 15 16 1 Reference voltage output(1.25V) Non-inverting input to error amplifier Error amplifier output Dead time adjustment Ground — Output Power supply Capacitor for short-circuit protection and delay Output ON/OFF control — FA7613CP(E) ■ Absolute maximum ratings ■ Recommended operating conditions Item Symbol Rating Unit Item Symbol Min. Max. Unit Supply voltage VCC IOR ISINK Pd 22 V Supply voltage 2.5 20 V 5 mA Feedback resistance 50 mA Oscillator timing capacitor 400 mW Oscillator timing resistance VCC RNF CT RT Topr Tstg –20 to +85 °C Oscillation frequency fOSC –40 to +150 °C Reference voltage output current Output sink current Total power dissipation Operating temperature Storage temperature 100 220 kΩ 22,000 pF 4.7 100 kΩ 10 500 kHz ■ Electrical characteristics (Ta = 25°C, VCC = 5V, fOSC = 100kHz) Reference voltage section Item Symbol Test condition Min. Typ. Max. Unit Output voltage VREF LINE LOAD VTC1 IOR = 1mA VCC = 2.5 to 20V IOR = 0.1 to 1mA 1.210 1.235 1.260 V 1 5 mV 5 10 mV Ta = –20 to +25°C –1 1 % VTC2 Ta = +25 to +85°C –1 1 % Item Symbol Test condition Min. Typ. Max. Unit Oscillation frequency CT = 1000pF, RT = 4.7kΩ VCC = 2.5 to 20V 120 140 160 kHz Frequency variation 1 (due to supply voltage change) fOSC fdV Frequency variation 2 (due to temperature change) fdT Ta = –20 to +85°C Item Symbol Test condition Input bias current IB+ Pin 3 = 1.25V IB– AV GB VOM+ VOM– Pin 4 = 1.25V IOM+ VOM = 1V 25 Item Symbol Test condition Min. Input threshold voltage (Pin 5) VTH0 VTH50 Duty cycle = 0% Duty cycle = 50% 1.13 Line regulation Load regulation Output voltage variation due to temperature change Oscillator section 2 % 4 % Error amplifier section Open-loop voltage gain Unity-gain bandwidth Maximum output voltage (Pin 5) Output source current (Pin 5) Min. Typ. Max. Unit 0.1 1.0 µA 0.1 1.0 µA 70 dB 1.0 RNF = 200kΩ MHz 4.8 V RNF = 200kΩ 200 mV 100 µA Typ. Max. Unit 0.80 0.90 50 PWM comparator section Input threshold voltage (Pin 5) V V 2 FA7613CP(E) Dead time adjustment circuit section Item Symbol Input bias current(Pin 6) IBDT VTH DT0 VTH DT50 Item Symbol Test condition Input threshold voltage (Pin 5) VTH PC ICHG VL Pin 12 = 0V, Pin 6, Pin 5 = 2V 15 Item Symbol Test condition L-level output voltage (Pin 10) VOL Output sink current = 20mA Item Symbol Test condition Min. Input current (Pin 15) ION/OFF Pin 15 = 5V 0.5 OFF-to-ON threshold voltage (Pin 15) VTH ON 0.6 Min. Input threshold voltage (Pin 6) Input threshold voltage (Pin 6) Test condition Min. Typ. Max. Unit 0.3 1.0 µA Duty cycle = 0% 0.10 0.20 Duty cycle = 50% 0.47 V V Short-circuit protection circuit section Charge current (Pin 12) Latch-mode threshold voltage (Pin 12) Min. Typ. Max. Unit 2.05 2.35 2.65 V 35 55 µA 0.90 1.20 1.50 V Min. Typ. Max. Unit 1.0 1.5 V Typ. Max. Unit 1.0 2.0 mA 0.8 1.0 V Typ. Max. Unit Output section Output ON/OFF circuit section Overall device Item Symbol Test condition Standby current I CC ST Pin 15 = 0V 0.5 10 µA Supply current ICC LA Latch mode 1.5 2.5 mA Operating-state supply current ICC AV RL = ∞ Duty cycle = 50% 2.0 4.0 mA ■ Characteristic curves (Ta = 25°C) fOSC (kHz) CT [pF] 3 Output duty cycle vs. DT terminal voltage (VDT) Output duty cycle [%] Oscillation frequency (fOSC) vs. timing capacitor capacitance (CT) VDT [V] FA7613CP(E) L-level output voltage (VOL ) vs. output sink current (ISINK) Supply current (ICC ) vs. supply voltage (VCC) Error amplifier frequency (f) vs. voltage gain (AV ) VOL [V] Output duty cycle vs. FB terminal voltage (VFB) I ON/OFF [mA] Output ON/OFF control terminal input current (ION/OFF) vs. voltage(VON/OFF) VON/OFF [V] 4 FA7613CP(E) ■ Application circuit Á Flyback-transformer type 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. 5