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FA3629AV Schematic ( PDF Datasheet ) - Fuji Electric

Teilenummer FA3629AV
Beschreibung For Switching Power Supply Control
Hersteller Fuji Electric
Logo Fuji Electric Logo 




Gesamt 7 Seiten
FA3629AV Datasheet, Funktion
FA3629AV
s Description
FA3629AV is a Power IC which includes DC-DC
converter controller and Nch-power MOSFET.
This IC can directly drive Nch/Pch MOSFET.
This IC is suitable to reduce converter size because it has
many functions in a small package TSSOP.
s Features
• Low input voltage: 2.5V to 6.5V
• 40V CDMOS Process:
Built-in 0.3Nch-Power MOSFET(ch1, open drain)
• 3-channels PWM Control:
2 boost circuits(ch1, ch2), 1 inverting circuit (ch3)
• Adjustable soft start time and maximum duty cycle
• Built-in timer latch for short circuit protection:
Delay time = 216 / (switching frequency)
• Built-in protection functions: Overcurrent limit for MOSFET,
overheat protection, undervoltage lockout
• Wide range of operation frequency: 100kHz to 1MHz
• Package: TSSOP-16(Thin and small)
s Applications
• Power supply for general equipment
CMOS IC
For Switching Power SuppFlyA3C6o2n9tAroVl
s Dimensions, mm
TSSOP-16
16 9
18
5.2
0.2±0.05
0.65
0.5±0.08
s Block diagram
Pin Pin
No. symbol
1 FB1
2 IN1–
3 IN2–
4 GND
5 PGND
6 FB2
7 IN3–
8 FB3
9 OUT3
10 OUT2
11 VCC
12 OUT1
13 REG
14 CT
15 CS3
16 CS
Description
Ch.1 output of error amplifier
Ch.1 inverting input to error
amplifier
Ch. 2 inverting input to error
amplifier
Ground of control blocks
Ground of large power blocks
Ch. 2 output of error amplifier
Ch. 3 inverting input to error
amplifier
Ch. 3 output of error amplifier
Ch. 3 output (for Pch-MOSFET)
Ch. 2 output (for Nch-MOSFET)
Power supply
Ch.1 drain output of internal
Nch-MOSFET
Regulated voltage output
Oscillator timing capacitor
Soft start for Ch. 3
Soft start for Ch.1 and Ch. 2
1






FA3629AV Datasheet, Funktion
FA3629AV
Output (Ch. 2) duty cycle vs FB terminal voltage (VFB)
100
fOSC=150kHZ
90
fOSC=550kHZ
80
fOSC=800kHZ
70
60
50
40
30
20
10
0
0.5 0.7 0.9 1.1 1.3 1.5
FB [V]
H-level output voltage (VOH) vs output source current (ISO)
OUT2, OUT3
Output (Ch. 3) duty cycle vs. FB3 terminal voltage (VFB3)
100
90
80
fOSC=800kHZ
70
fOSC=150kHZ
fOSC=550kHZ
60
50
40
30
20
10
0
0.5 0.7 0.9 1.1 1.3 1.5
FB3 [V]
L-level output voltage (VOL) vs. output sink current (ISI)
OUT2, OUT3
4.0
VCC=5.0V
2.0
VCC=3.0V
4.0
VCC=5.0V
2.0
VCC=3.0V
0
– 400
– 200
ISO [mA]
0
0
0
200
ISI [mA]
400
6

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