FA7610CP(N)/12CP(N)/17CP(N)
s
Description
The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar
ICs containing basic circuits necessary for PWM-type
switching power supply control.
To minimize the number of external discrete components, the
FA7610CP(N) is provided for a flyback or step-up power-
supply circuit, the FA7612CP(N) for a step-down power-supply
circuit and FA7617CP(N) for a flyback power supply circuit.
Bipolar IC
For Switching Power Supply Control
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
s
Dimensions, mm
SOP-8
8
5
s
Features
FA7610CP(N)
• For flyback transformer-type or step-up power-supply circuit
(maximum output duty = 64% typical)
• Totem-pole predriver
• PWM-type switching power supply control
• Low-voltage operation (V
CC
= 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction
by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
FA7612CP(N)
• For step-down power-supply circuit
(maximum output duty = up to 100%)
• Open collector output
• PWM-type switching power supply control
• Low-voltage operation (V
CC
= 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction
by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
FA7617CP(N)
• For flyback transformer-type power-supply circuit (maximum
output duty = 67% typical)
• Open collector output
• PWM-type switching power supply control
• Low-voltage operation (V
CC
= 3.6 to 22V)
• Latch-mode short-circuit protection function (no malfunction
by noise)
• Soft-start function
• Undervoltage lockout function
• One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
1
4.9
4
+0.1
–0.05
6.0
±0.2
3.9
0.4
±0.1
1.27
±0.2
DIP-8
8
5
1
9.3
1.5
4
6.5
3.0min 4.5max
3.4
0~8
°
0.3
7.6
+0.1 5
–0.0
2.54
±0.25
0.5
±0.1
0~15
˚
0~1
5˚
s
Applications
• Battery power supply for portable equipment
1.7max
0.20
1
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
s
Block diagram
FA7610CP(N)
Pin
No.
1
2
3
4
5
6
7
8
Pin
symbol
Description
Inverting input to error amplifier
Error amplifier output
Ground
Output
Power supply
Capacitor for soft-start, short-circuit protection and delay
Oscillator timing capacitor
Reference voltage output (2.5V)
IN (–)
FB
GND
OUT
VCC
CS
CT
REF
FA7612CP(N)
Pin
No.
1
2
3
4
5
6
7
8
Pin
symbol
Description
Inverting input to error amplifier
Error amplifier output
Ground
Output
Power supply
Capacitor for soft-start, short-circuit protection and delay
Oscillator timing capacitor
Reference voltage output (2.5V)
IN (–)
FB
GND
OUT
VCC
CS
CT
REF
FA7617CP(N)
Pin
No.
1
2
3
4
5
6
7
8
Pin
symbol
Description
Inverting input to error amplifier
Error amplifier output
Ground
Output
Power supply
Capacitor for soft-start, short-circuit protection and delay
Oscillator timing capacitor
Reference voltage output (2.5V)
IN (–)
FB
GND
OUT
VCC
CS
CT
REF
2
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
s
Absolute maximum ratings
(Ta = 25°C)
Item
Supply voltage
Reference voltage output current
Output current
Total power dissipation
Operating temperature
Storage temperature
Symbol
Rating
FA7610C
FA7612C/17C
22
5
80
400
–20 to +85
–40 to +150
V
mA
mA
mW
°C
°C
22
5
±50
400
–20 to +85
–40 to +150
Unit
V
CC
I
OR
I
O
P
d
T
opr
T
stg
s
Recommended operating conditions
Item
Symbol
FA7610C
Min.
Supply voltage
Feedback resistance
Oscillator timing capacitor
Oscillator timing resistance
Oscillation frequency
Max.
20
22,000
100
200
FA7612/17C
Min.
3.6
100
220
10
5
22,000
100
500
Max.
20
V
kΩ
pF
kΩ
kHz
Unit
V
CC
R
NF
C
T
R
T
f
OSC
3.6
100
220
10
5
s
Electrical characteristics
(Ta = 25°C, V
CC
= 6V, R
T
= 33kΩ, C
T
= 1000pF)
Reference voltage section
Common to FA7610C/12C/17C
Item
Output voltage
Line regulation
Load regulation
Output voltage variation due to temperature change
Symbol
Test condition
Min.
Typ.
2.580
4
1
–1
–1
Max.
2.632
12
6
1
1
Unit
V
mV
mV
%
%
V
REF
L
INE
L
OAD
V
TC1
V
TC2
I
OR
= 1mA
2.528
V
CC
= 3.6 to 20V,
I
OR
= 1mA
I
OR
= 0.1 to 1mA
Ta = –20 to +25°C
Ta = +25 to +85°C
Oscillator section
Common to FA7610C/12C/17C
Item
Oscillation frequency
Frequency variation 1 (due to supply voltage change)
Frequency variation 2 (due to temperature change)
Symbol
Test condition
Min.
100
Typ.
111
1
5
Max.
122
Unit
kHz
%
%
f
OSC
f
dV
f
dT
C
T
= 1000pF,
R
T
= 33kΩ
V
CC
= 3.6 to 20V
Ta = –20 to +85°C
Error amplifier section
Common to FA7610C/12C/17C
Item
Reference voltage
Input bias current
Open-loop voltage gain
Unity-gain bandwidth
Maximam output voltage (Pin 2)
Output source current (Pin 2)
Symbol
Test condition
Min.
0.515
70
0.6
Typ.
0.525
5
Max.
0.535
100
Unit
V
nA
dB
MHz
V
200
40
85
200
mV
V
B
I
B
A
V
G
B
V
OM+
V
OM–
I
OM+
R
NF
= 100kΩ
R
NF
= 100kΩ
V
OM
= 1V
V
REF
–0.2
µ
A
PWM comparator section
Item
Symbol Test condition
FA7610C
Min.
Input threshold voltage (pin 2)
Input threshold voltage (pin 2)
Maximum duty cycle
Typ.
0.85
1.1
58
64
75
Max.
0.95
FA7612C
Min.
Typ.
0.85
1.1
100
63
Max.
0.95
FA7617C
Min.
Typ.
0.85
1.1
67
71
Max.
0.95
V
V
%
Unit
V
TH0
V
TH50
αM
Duty cycle = 0%
Duty cycle = 50%
(Pin 2 = 1.2V)
3
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
Soft-start circuit section
Common to FA7610C/12C/17C
Item
Input bias current (Pin 6)
Input threshold voltage (Pin 6)
Input threshold voltage (Pin 6)
Symbol
Test condition
Duty cycle = 0%
Duty cycle = 50%
Min.
Typ.
80
0.22
0.46
Max.
300
0.32
Unit
nA
V
V
I
BCS
V
TH CS0
V
TH CS50
Short-circuit protection circuit section
Common to FA7610C/12C/17C
Item
Input threshold voltage (Pin 2)
Charge current (Pin 6)
Latch-mode threshold voltage (Pin 6)
Symbol
Test condition
Pin 6 = 0V, Pin 2 = 2V
Min.
1.20
20
1.20
Typ.
1.50
30
1.50
Max.
1.80
40
1.80
Unit
V
V
TH PC
I
CHG
V
TH LA
µ
A
V
Undervoltage lockout circuit section
Common to FA7610C/12C/17C
Item
OFF-to-ON threshold voltage
ON-to-OFF threshold voltage
Voltage hysteresis
Symbol
Test condition
Min.
Typ.
2.70
2.52
60
180
Max.
Unit
V
V
mV
V
TH ON
V
TH OFF
V
HYS
Output section
Item
H-level output voltage (Pin 4)
L-level output voltage (Pin 4)
Output source current (Pin 4)
Symbol
Test condition
FA7610C
Min.
Typ.
4.0
0.25
8
11
0.65
14
—
3.5
FA7612C/17C
Max. Min.
—
Typ.
—
0.9
—
Max.
—
1.5
—
V
V
mA
Unit
V
OH
V
OL
I
SOURCE
R
L
= 10kΩ
Output sink
current = 20mA
Pin 4 = 0V
Overall device
Item
Supply current
Operating-state supply current
Symbol
Test condition
Latch mode
FA7610C
Min.
Typ.
1.6
2.6
2.2
3.8
FA7612C/17C
Max. Min.
Typ.
1.5
1.8
Max.
2.2
3.0
mA
mA
Unit
I
CC LA
I
CC AV
R
L
=
∞
Duty cycle = 50%
4
FA7610CP(N)/FA7612CP(N)/FA7617CP(N)
s
Characteristic curves
(Ta = 25°C)
Oscillation frequency(f
OSC
) vs.
timing capacitor capacitance(C
T
)
Output duty cycle vs. CS terminal voltage(V
CS
)
Output source current (I
source
) vs.
supply voltage(V
CC
)
L-level output voltage(V
OL
) vs. output sink current
(I
SINK
)
Supply current(I
CC
) vs. supply voltage(V
CC
)
Error amplifier frequency(f) vs. voltage gain(AV) / phase (θ)
5
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