FA5515N

FA551X series FA5510P (N), FA5511P (N) FA5514P (N), FA5515P (N) ■ Description The FA551X series are the PWM type switching power supply control ICs that can directly drive power MOSFET. These ICs use a CMOS device with high dielectric strength (30V) to implement low power consumption. These ICs contain many function in a small 8-pin package. With these ICs, a highperformance and compact power supply can be created because not many external discrete components are needed. CMOS IC For Switching Power Supply Control FA551X ■ Dimensions, mm SOP-8 8 5 1 4.9 4 +0.1 –0.05 6.0±0.2 3.9 ■ Features • Low current consumption by CMOS process with high dielectric strength (30V) • Standby current of 2µA or less (at Vcc=14V), and operating current of 1.5mA (typ) • Overvoltage protection function detecting the Vcc voltage • A drive circuit for connecting a power MOSFET directly • Output peak current: ±1.5A • Pulse-by-pulse overcurrent limiting function • Overload protection function (latch or non-latch mode selectable) • Output ON-OFF function by external signal • Latch-mode overvoltage shutdown function • Undervoltage lockout function (16.5V ON / 9V OFF) • Reference voltage output (5V) • 8-pin package (DIP/SOP) 0.4±0.1 1.27 DIP-8 8 5 1 9.3 4 1.5±0.3 6.4 3.0min 4.5max 3.3 0~8° ■ Block diagram FA5510P (N), FA5511P (N) CS(8) REF (7) 5V VCC ENB 5V REF 8.5V/7.9V 0.8V 3.5V ENB 4V PWM Dmax FA5510: 46% FA5511: 70% OSC RT CT OUT PUT 0.8V/0.68V 5.2µA 0.95mA 15.5V 15.5V UVLO 0.05 0.25 – 7.62 0~15 ˚ 0~1 5˚ VCC(6) 2.54 0.46±0.1 16.5V/9V FB (2) OUT (5) Pin Pin Function No. symbol 1 RT FB IS GND OUT VCC REF CS Oscillator timing resistor Feedback Overcurrent detection Ground Output Power supply Reference voltage Soft-start and ON/OFF control Description Setting oscillation frequency Input of PWM comparator Input of the overcurrent limiting function Ground Output for driving a power MOSFET Power supply Reference voltage output (5V) Soft-start, ON/OFF function and latch-mode shutdown operations R +0.24V GND (4) 2 3 4 5 6 7 8 QB SQ FF 5V Controlled block RT(1) IS+(3) FA5514P (N), FA5515P (N) CS(8) REF (7) 5V VCC ENB 5V REF 8.5V/7.9V 0.8V 3.5V ENB 4V PWM Dmax FA5514: 46% FA5515: 70% OSC RT CT OUT PUT 0.8V/0.68V 5.2µA 0.95mA 15.5V 15.5V UVLO VCC(6) Type FA5510P OUT (5) Max. duty cycle (typ.) 46% 70% 46% 70% Polarity of overcurrent Package detection + + – – DIP-8 SOP-8 DIP-8 SOP-8 DIP-8 SOP-8 DIP-8 SOP-8 16.5V/9V FA5510N FA5511P FA5511N FB (2) R -0.17V GND (4) FA5514P FA5514N FA5515P FA5515N QB SQ FF 5V Controlled block RT(1) IS-(3) 1.8max +0.1 0.20 1 FA551X ■ Absolute maximum ratings Item Supply Voltage Low impedance source (ICC>15mA) Internal zener clamp (ICC