FA3686 Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – For Switching Power Supply Control

FA3686V
CMOS IC
For Switching Power SuppFlyAC3o6n8tr6oVl
s Description
FA3686V is a PWM type DC-to-DC converter control IC with
2ch outputs that can directly drive power MOSFETs. CMOS
devices with high breakdown voltage are used in this IC and
low power consumption is achieved. This IC is suitable for very
small DC-to-DC converters because of their small and thin
package (1.1mm max.), and high frequency operation (to
1.5MHz). This IC contains built-in an error amplifier for series
regulators, therefore, this IC is suitable for the 3ch power supply
with a 2ch DC-to-DC converter and a 1ch series regulator.
s Features
• Wide range of supply voltage: VCC=2.5 to 20V
• MOSFET direct driving
• Low operating current consumption by CMOS process:
3.0mA (typ.)
• 2ch PWM control IC
• High frequency operation: 300kHz to 1.5MHz
• Simple setting of operation frequency by timing resistor
• Built-in error amplifier for series regulator
• Soft start function on each channel (1ch, 2ch only)
• Maximum output duty cycle: 85% (typ.), at 500kHz
• Built-in under voltage lockout
• High accuracy reference voltage: VREF: 1.00V±1%,
VREG: 2.20V±1%
• Timer latch for short-circuit protection with counter
• PGS pin for a power supply fault signal
• Thin and small package: TSSOP-16
s Dimensions, mm
TSSOP-16
16
9
1
8
5
0.22^±0.02
0.65
0.5^±0.08
s Block diagram
Pin No. Pin symbol Description
1
FB3
Ch.3 output of error amplifier
2
IN3-
Ch.3 inverting input to error amplifier
3
FB2
Ch.2 output of error amplifier
4
IN2-
Ch.2 inverting input to error amplifier
5
PGS
PGS signal output
6
VCC
Power supply
7
CS2
Soft start for Ch.2
8
OUT2
Ch.2 output
9
OUT1
Ch.1 output
10
CS1
Soft start for Ch.1
11
GND
Ground
12
RT
Oscillator timing resistor
13
VREG
Regulated voltage output
14
IN1-
Ch.1 inverting input to error amplifier
15
FB1
Ch.1 output of error amplifier
16
TL
Timer latched short circuit protection
1