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PDF FA7622CPE Data sheet ( Hoja de datos )

Número de pieza FA7622CPE
Descripción Bipolar IC For Switching Power Supply Control
Fabricantes Fuji Electric 
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FFAA76272C6P(2E) 2CP(E)
Bipolar IC
For Switching Power Supply Control
s Description
The FA7622CP(E) is a DC-DC converter IC that can directly
drive a power MOSFET. This IC has all the necessary
protection functions for a power MOSFET. It is optimum for a
portable equipment power supply which uses low-voltage input
to output comparably large power.
s Features
• Drive circuit for connecting a power MOSFET
(Io = ±600mA)
• Built-in voltage step-up circuit to drive a power MOSFET
gate: A converter circuit requires only an N-channel power
MOSFET.
• Dual control circuit
• Overcurrent limiting circuit
• Overload cutoff circuit with timer and latch circuit
• ON/OFF control pin
• Wide operating range: 3.6 to 28V
• High-frequency operation: up to 1MHz
• 20-pin package (DIP/SSOP)
s Applications
• Battery power supply for portable equipment
s Dimensions, mm
SSOP-20
20 11
1 10
7.2
0.3
DIP-20
20
0.65
0.6
11
1
0.77
24.4
10
1.52
s Block diagram
REF
20
ON/OFF 19
BIAS
2.54±0.25
DT1 CT RT VCC1
16 1 2 14
SW
13
OSC
SW
UVLO
12 VCC2
FB1 17
IN1+ 18
VB
CP 3
+
-
ER, AMP1
Duty
limit
OCP
+
-
-
PWM1
Timer
&
latch
IN2+ 4
IN2- 5
FB2 6
ER, AMP2
+
-
+
-
-
PWM2
Duty
limit
OCP
7
DT2
15 OCL1
11 OUT1
10 OUT2
8 OCL2
9
GND
0.46±0.1
7.62
0~15˚
0.25+–00..105
0~15˚
Pin Pin
No. symbol
Description
1 CT
Oscillator timing capacitor
2 RT
Oscillator timing resistor
3 CP
Timer and latch circuit
4 IN2+
Non-inverting input to error
amplifier
5 IN2-
Inverting input to error amplifier
6 FB2
Error amplifier output
7 DT2
Dead time adjustment
8 OCL2
Overcurrent limiting circuit 2
9 GND
Ground
10 OUT2
CH.2 output
11 OUT1
CH.1 output
12 VCC2
Power supply 2
13 SW
Switch for boost circuit
14 VCC1
Power supply 1
15 OCL1
Overcurrent limiting circuit 1
16 DT1
Dead time adjustment
17 FB1
Error amplifier output
18 IN1+
Non-inverting input to error
amplifier
19 ON/OFF Output ON/OFF control
20 REF
Reference voltage output
1

1 page




FA7622CPE pdf
FA7622CP(E)
• Inverting chopper circuit
According to the circuit shown in Fig. 5, the power output
voltage VOUTB can be determined as follows:
REF
20
R11
VOUTB =
• VREF .............................. (5)
R10
The AV between the VOUTB and FB2 pins can be determined
as follows:
–R11
AV ϩ
................................................. (6)
R12
R10
IN2+
R9
IN2 - 4
5
R11
R12
R13
C3
6
FB2
ϩ
Ϫ
ER.AMP2
V OUTB (Controlled by Q3)
Fig. 5
To correct the phase, connect the resistor R13 and capacitor
C3 in series between the IN2– and FB2 pins.
By using this circuit, invert the output polarity of OUT2 with an
external transistor to drive a P-channel MOSFET (or PNP
transistor).
DT1(DT2)
CT
FB1(FB2)
V CC1
10
OUT2
Q3
3. PWM comparator section
As Fig. 6 shows, a PWM comparator has three input
terminals. PWM comparator 1 determines the duty cycle of
the output from the OUT1 pin. This comparator compares the
CT oscillator Voltage (Pin 1) with the FB1 voltage (Pin 17) or
the DT1 voltage (Pin 16), whichever is greater. When the
highest of these voltages is lower than the CT voltage, the
PWM output is high. When it is higher than CT, the PWM
output is low.
PWM comparator 2 determines the duty cycle of the output
from the OUT2 pin. To determine the PWM output, this
comparator compares the CT oscillator voltage (Pin 1) with the
FB2 voltage (Pin 6) or the DT2 voltage (Pin 7) whichever is
higher.
During ordinary operation, the OUT1 and OUT2 pin voltages
have the same polarity as the output from each comparator.
When the power supply is turned on, the pulse width
gradually increases. The time constant for soft-start is
determined by the external resistor and capacitor across pins
16 and 7. In Figures 7 and 8, the time ts required for the pulse
width (duty-cycle) to reach about 30% after start-up can be
determined as follows:
(Units: µF for Cs and kfor Rs, Rs1, and Rs2)
Fig.7:
tS (mS) = 0.54CS • RS ................................. (7)
Fig.8:
RS1 • RS2
RS1
tS (mS) = CS
• ln
……(8)
RS1 ϩ RS2
0.417RS1 – 0.583 RS2
Where, RS1 / RS2 > 0.716
Please connect enough large capacitance between REF and
GND pins in order to prevent irregular output pulse caused by
minus voltage at DT1 or DT2 pin when IC is shut down.
PWM output
CT
DT1(DT2)
FB1(FB2)
ϩ
Ϫ
Ϫ PWM1
(PWM2)
Fig. 6
PWM output
Time
CT
1
CS
DT1(DT2)
RS
FB1(FB2)
REF
20
ϩ PWM output
Ϫ
Ϫ
PWM1
(PWM2)
Fig. 7
CS RS1
CT
1
DT1(DT2)
RS2
FB1(FB2)
REF
20
ϩ PWM output
Ϫ
Ϫ
PWM1
(PWM2)
Fig. 8
5

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