FA7630CP(E)
1
s
Block diagram
Pin
Pin
Description
No.
symbol
1
CT
Oscillator timing capacitor
2
RT
Oscillator timing resistor
3
ON/OFF2
Output ON/OFF control 2
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
VCC
Power supply
13
OCL1
Overcurrent limiting circuit
14
DT1
Dead time adjustment
15
FB1
Error amplifier output
16
IN1+
Non-inverting input to error
amplifier
17
ON/OFF1
Output ON/OFF control 1
18
SYNC IN
Synchronizing signal input
19
CP
Timer and latch circuit
20
REF
Reference voltage output
FA7630CP(E)
s
Dimensions, mm
SSOP-20
1
7.2
10
11
20
5.3
0.6
0~10
0.65
7.9
0.3
0.1
0.1
0.3
0.2
+
0
.1
0
.05
2.1max
DIP-20
1
20
11
10
24.4
6.4
7.62
3.6
5.1max
1.52
0.77
2.54min
0.51min
0~15
0~15
0.46
0.1
2.54
0.25
0.25
+0.1
0.05
Bipolar IC
For Switching Power Supply Control
s
Description
The FA7630CP(E) is dual channel PWM-type switching power
supply control IC.
This IC can drive Pch-MOSFET directly and is optimum for
large power DC-DC converter.
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
Dual channel PWM-type switching power supply control
2.6% (V
REF
) and
3% (V
B
) reference voltage
Low voltage operation (Vcc: 5 to 20V)
Drive circuit for connecting a Pch-MOSFET
Overload cutoff circuit with timer latch circuit
Soft start circuit
Undervoltage lockout function (UVLO)
Pulse-by-pulse overcurrent limiting function
Output ON/OFF control function for each channel
Master-slave synchronized operation without external
components
Maximum operating frequency is 500kHz
FA7630CP(E)
2
s
Electrical characteristics (Ta=25
C, V
CC
=6V, C
T
=180pF, R
T
=47k
)
Reference voltage section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Output voltage
V
REF
I
OR
= 1mA
2.450
2.520
2.580
V
Line regulation
L
INE
V
CC
= 5.0 to 20V
5
20
mV
I
OR
=1mA
Load regulation
L
OAD
I
OR
= 0.1 to 1mA
30
50
mV
Output voltage variation due to temperature change
V
TC1
Ta = 20 to +25
C
1
1
%
V
TC2
Ta = +25 to +85
C
1
1
%
s
Absolute maximum ratings
Item
Symbol
Rating
Unit
Maximum supply voltage
V
CC
22
V
Maximum output current
I
OUT
500
mA
Maximum power dissipation
P
d
650
mW
Junction temperature
T
J
125
C
Operating temperature
T
opr
20 to +85
C
Storage temperature
T
stg
40 to +150
C
s
Recommended operating conditions
Item
Symbol
Min.
Max.
Unit
Supply voltage
V
CC
5
20
V
Feedback resistance
R
NF
100
k
Oscillator timing capacitance
C
T
50
2200
pF
Oscillator timing resistance
R
T
24
100
k
Oscillation frequency
f
OSC
50
500
kHz
Oscillation and synchronizing circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
C
T
=180pF,
R
T
=47k
74
83
92
kHz
Frequency variation(due to supply voltage change)
f
dV
V
CC
= 3.6 to 20V
1
%
Frequency variation(due to temperature change)
f
dT
Ta = 20 to +85
C
5
%
H level of synchronizing signal
V
SYH
1.5
1.8
V
L level of synchronizing signal
V
SYL
0.8
1.1
V
Cutoff level of synchronizing signal
V
SD
0.4
V
Bias current of synchronizing signal
I
SYNC
V
SYNC
=1.6V
5
A
Error amplifier section (Ch.1)
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Reference voltage
V
B
0.769
0.793
0.817
V
Input bias current
I
B
5
100
nA
Open-loop voltage gain
A
VO
60
dB
Unity-gain bandwidth
f
T
1
MHz
H state output voltage
V
OH
No load
2.10
V
L state output voltage
V
OL
No load
300
mV
Output source current
I
OH
V
OH
=1V
40
55
100
A
Error amplifier section (Ch.2)
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input offset voltage
V
IO
2
10
mV
Input bias current
I
B
5
100
nA
Common-mode input voltage
V
COM
0
1.0
V
Open-loop voltage gain
A
VO
70
dB
Unity-gain bandwidth
f
T
1.0
MHz
H state output voltage
V
OH
No load
2.10
V
L state output voltage
V
OL
No load
300
mV
Output source current
I
OH
V
OH
=1V
50
65
200
A
FA7630CP(E)
3
Timer and latch circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Latch-mode threshold voltage
V
THCP
1.00
1.25
1.50
V
Input bias current
I
INCP
V
CP
=1.5V,
V
FB
=0.3V
1
A
CP pin voltage / LOW
V
SATC
I
CP
=20
A,
V
FB
=1.0V
300
mV
Output ON/OFF control section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
OFF-to-ON threshold voltage
V
THON
3.0
V
ON-to-OFF threshold voltage
V
THOF
0.60
V
Input bias current
I
IN
V
IN
=3V
230
350
A
Undervoltage lock-out circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
OFF-to-ON threshold voltage
V
CCON
3.92
4.20
4.48
V
ON-to-OFF threshold voltage
V
CCOF
3.50
V
Voltage hysteresis
V
HYS
0.70
V
Output section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Saturation voltage(H level)
V
SAT+
I
O
= 50mA
1.60
2.00
V
Saturation voltage(L level)
V
SAT
I
O
= 50mA
1.40
1.80
V
Pulse width modulation circuit section (FB pin)
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage
V
THO
Duty cycle = 0%
1.65
V
Input threshold voltage
V
TH1
Duty cycle = 100%
0.95
V
Dead time adjustment circuit section (DT pin)
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage
V
THO
Duty cycle = 0%
1.65
V
Input threshold voltage
V
TH1
Duty cycle = 100%
0.95
V
Standby voltage
V
STB
DT pin open
1.80
V
Overcurrent limiting circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage
V
THOC
175
200
225
mV
Hysteresis voltage
V
HYOC
40
mV
Input bias current
I
OC
45
80
A
Delay in OCL
t
doc
Overdriving : 50mV
120
ns
Overall device
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Standby supply current
I
CCST
Out pin open
0.1
10
A
Operating-state supply current
I
CC1
Single channel operation
2.20
3.20
mA
Duty cycle =50%
I
CC2
Dual channel operation
3.00
4.20
mA
Duty cycle =50%
FA7630CP(E)
4
s
Application circuit
Individual application circuit
FA7630CP(E)
5
Master-slave application circuit
Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.
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