FA3647N

Features:

• Uses a newly developed CMOS process with high dielectric strength (30V) for implementing low power consumption
• Standby current of 2µA or less (at Vcc=14V), and operating current of 1.9mA (typ.)
• Automatically reduces the oscillation frequency to suppress loss of the power supply in light load mode
• Overvoltage protection function detecting Vcc voltage
• A drive circuit for connecting a power MOSFET directly
• Output peak current: Source current 500mA
                                     Sink current +1A
• Pulse-by-pulse overcurrent limiting function
• Overload cutoff function (latch or non-latch mode selectable)
• Output ON/OFF control 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)


Specifications

Item	Symbol	Test condition	Rating	Unit
Supply voltage	VCC1	Low impedance source (Icc >15mA)	30	V
	VCC2	Internal ZD clamp (Icc < 15mA)	Self limiting	V
Output peak current	IOL	Sink current	+1.0	A
	IOH	Source current	-0.5	A
FB pin input voltage	VFB		0.3 to 5.0	V
REF pin output current	IREF		10	mA
IS pin input voltage	VIS		0.3 to 5.0	V
CS pin input current	ICS		2.0	mA
Total power dissipation	Pd	at Ta =25 DIP SOP	800 *1 400 *2	mW
Operating temperature	Topr		30 to +85
Junction temperature	Tj		125
Storage temperature	Tstg		40 to +150

Description

The FA3641P(N) and FA3647P(N) are the PWM type switching power supply control ICs that can directly drive power MOSFET.

These FA3641P(N) and FA3647P(N) ICs use a CMOS device with high dielectric strength (30V) to implement low power consumption. They feature a number of functions that are equivalent to those of the FA531X series consisting of bipolar devices. In addition, they have a function that reduces the oscillation frequency to suppress loss of the power supply in light load mode and support an overvoltage protection detecting Vcc voltage. These ICs are most suitable for high-performance, energy-saving power supplies that require low input power in standby or no-load mode.