FA7613CP(E)
1
s
Description
The FA7613CP(E) is a bipolar IC containing basic circuit
necessary for PWM-type switching power supply control. The
supply voltage range is from 2.5V.
s
Features
Low-voltage operation (V
CC
= 2.5 to 22V)
Open collector output
Latch-mode short-circuit protection function (no malfunction
due to electrical noise)
Soft-strat function
Output ON/OFF control function
Low standby current (Max. 10
A)
Not many external discrete components needed
s
Applications
Battery power supply for portable equipment
s
Dimensions, mm
SSOP-16
1
8
9
16
0.6
0~10
0.65
7.9
0.3
5.3
6.2
0.1
0.1
0.2
+0.1
0.05
0.3
2.1max
DIP-16
Bipolar IC
For Switching Power Supply Control
s
Block diagram
FA7613CP(E)
Pin
Pin
Description
No.
symbol
1
NC
--
2
REF
Reference voltage output(1.25V)
3
IN (+)
Non-inverting input to error
amplifier
4
IN ()
Inverting input to error amplifier
5
FB
Error amplifier output
6
DT
Dead time adjustment
7
GND
Ground
8
NC
--
9
NC
--
10
OUT
Output
11
VCC
Power supply
12
SCP
Capacitor for short-circuit
protection and delay
13
CT
Oscillator timing capacitor
14
RT
Oscillator timing resistance
15
ON/OFF
Output ON/OFF control
16
NC
--
1
16
9
8
19.4
6.5
7.6
3.4
4.3max
1.5
0.81
3.1min
0.2min
0~15
0~15
0.5
0.1
2.54
0.25
0.3
+0.1
0.05
FA7613CP(E)
2
s
Electrical characteristics (Ta = 25
C, V
CC
= 5V, f
OSC
= 100kHz)
Reference voltage section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Output voltage
V
REF
I
OR
= 1mA
1.210
1.235
1.260
V
Line regulation
L
INE
V
CC
= 2.5 to 20V
1
5
mV
Load regulation
L
OAD
I
OR
= 0.1 to 1mA
5
10
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
%
Oscillator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
C
T
= 1000pF,
R
T
= 4.7k
120
140
160
kHz
Frequency variation 1 (due to supply voltage change)
f
dV
V
CC
= 2.5 to 20V
2
%
Frequency variation 2 (due to temperature change)
f
dT
Ta = 20 to +85
C
4
%
Error amplifier section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current
I
B+
Pin 3 = 1.25V
0.1
1.0
A
I
B
Pin 4 = 1.25V
0.1
1.0
A
Open-loop voltage gain
A
V
70
dB
Unity-gain bandwidth
G
B
1.0
MHz
Maximum output voltage (Pin 5)
V
OM+
R
NF
= 200k
4.8
V
V
OM
R
NF
= 200k
200
mV
Output source current (Pin 5)
I
OM+
V
OM
= 1V
25
50
100
A
PWM comparator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage (Pin 5)
V
TH0
Duty cycle = 0%
0.80
0.90
V
Input threshold voltage (Pin 5)
V
TH50
Duty cycle = 50%
1.13
V
s
Absolute maximum ratings
Item
Symbol
Rating
Unit
Supply voltage
V
CC
22
V
Reference voltage output current
I
OR
5
mA
Output sink current
I
SINK
50
mA
Total power dissipation
P
d
400
mW
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
2.5
20
V
Feedback resistance
R
NF
100
k
Oscillator timing capacitor
C
T
220
22,000
pF
Oscillator timing resistance
R
T
4.7
100
k
Oscillation frequency
f
OSC
10
500
kHz
FA7613CP(E)
3
Dead time adjustment circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current(Pin 6)
I
BDT
0.3
1.0
A
Input threshold voltage (Pin 6)
V
TH DT0
Duty cycle = 0%
0.10
0.20
V
Input threshold voltage (Pin 6)
V
TH DT50
Duty cycle = 50%
0.47
V
Short-circuit protection circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage (Pin 5)
V
TH PC
2.05
2.35
2.65
V
Charge current (Pin 12)
I
CHG
Pin 12 = 0V, Pin 6, Pin 5 = 2V
15
35
55
A
Latch-mode threshold voltage (Pin 12)
V
L
0.90
1.20
1.50
V
Output section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
L-level output voltage (Pin 10)
V
OL
Output sink current = 20mA
1.0
1.5
V
Output ON/OFF circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input current (Pin 15)
I
ON/OFF
Pin 15 = 5V
0.5
1.0
2.0
mA
OFF-to-ON threshold voltage (Pin 15)
V
TH ON
0.6
0.8
1.0
V
Overall device
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Standby current
I
CC ST
Pin 15 = 0V
0.5
10
A
Supply current
I
CC LA
Latch mode
1.5
2.5
mA
Operating-state supply current
I
CC AV
R
L
=
Duty cycle = 50%
2.0
4.0
mA
s
Characteristic curves (Ta = 25
C)
Oscillation frequency (f
OSC
) vs.
Output duty cycle vs. DT terminal voltage (V
DT
)
timing capacitor capacitance (C
T
)
C
T
[pF]
V
DT
[V]
Output duty cycle [%]
f
OSC
(kHz)
FA7613CP(E)
4
Output duty cycle vs. FB terminal voltage (V
FB
)
Supply current (I
CC
) vs. supply voltage (V
CC
)
Error amplifier frequency (f) vs. voltage gain (A
V
)
Output ON/OFF control terminal input current (I
ON/OFF
) vs. voltage(V
ON/OFF
)
L-level output voltage (V
OL
) vs. output sink current (I
SINK
)
I
ON/OFF
[mA]
V
ON/OFF
[V]
V
OL
[V]
FA7613CP(E)
5
s
Application circuit
Flyback-transformer type converter 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.
Please connect a capacitor, which the value is about 0.01
F to 0.1
F,
between VCC
and REF terminals in order to prevent from irregular
output pulse at start-up.
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