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FA3686 Datasheet

  • FA3686

  • For Switching Power Supply Control

  • 18頁

  • ETC

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FA3686V
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.
CMOS IC
For Switching Power Supply Control
FA3686V
s
Dimensions, mm
TSSOP-16
16
9
鈥?Wide range of supply voltage: V
CC
=2.5 to 20V
鈥?MOSFET direct driving
鈥?Low operating current consumption by CMOS process:
3.0mA (typ.)
鈥?2ch PWM control IC
鈥?High frequency operation: 300kHz to 1.5MHz
鈥?Simple setting of operation frequency by timing resistor
鈥?Built-in error amplifier for series regulator
鈥?Soft start function on each channel (1ch, 2ch only)
鈥?Maximum output duty cycle: 85% (typ.), at 500kHz
鈥?Built-in under voltage lockout
鈥?High accuracy reference voltage: VREF: 1.00V鹵1%,
V
REG
: 2.20V鹵1%
鈥?Timer latch for short-circuit protection with counter
鈥?PGS pin for a power supply fault signal
鈥?Thin and small package: TSSOP-16
5
0.10
鹵0.05
1
0.105 to
0.145
s
Features
8
4.4
6.4
鹵0.2
0~8藲
0.5
鹵0.08
0.22
鹵0.02
0.65
s
Block diagram
Pin No. Pin symbol Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
FB3
IN3-
FB2
IN2-
PGS
VCC
CS2
OUT2
OUT1
CS1
GND
RT
VREG
IN1-
FB1
TL
Ch.3 output of error amplifier
Ch.3 inverting input to error amplifier
Ch.2 output of error amplifier
Ch.2 inverting input to error amplifier
PGS signal output
Power supply
Soft start for Ch.2
Ch.2 output
Ch.1 output
Soft start for Ch.1
Ground
Oscillator timing resistor
Regulated voltage output
Ch.1 inverting input to error amplifier
Ch.1 output of error amplifier
Timer latched short circuit protection
1.1max
1

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