FA5301BP(N)
1
FA5301BP(N)
s
Description
The FA5301BP(N) is a bipolar IC containing basic circuits
necessary for PWM-type switching power supply control.
This IC switches an external transistor according to external
synchronizing pulses.
s
Features
External synchronization input terminal
Wide supply voltage range (V
CC
=7 to 22V)
Open-collector output
Soft-start from standby mode
Double protection of output transistor by overcurrent limiting
and cutoff functions
Output ON/OFF control function
Not many external discrete components needed
s
Applications
Switching power supply for general equipment
(Optimum for TV, display, and other monitor devices)
s
Dimensions, mm
SOP-16
DIP-16
s
Block diagram
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
Bipolar IC
For Switching Power Supply Control
1
8
9
16
0.65
0.33
0~8
1.27
0.2
6.0
0.2
3.9
0.1
1.65
0.1
0.18
0.07
0.42
0.07
9.9
0.1
0.2
Pin
Pin
Description
No.
symbol
1
IN ()
Inverting input to error amplifier
2
IN (+)
Non-inverting input to error
amplifier
3
ER.OUT
Error amplifier output
4
FB
Feedback input
5
IS
Overcurrent detection
6
CD
Overcurrent cutoff delay
capacitor
7
GND
Ground
8
ON/OFF
Output ON/OFF control
9
OUT
Output
10
DT
Dead time adjustment
11
CT
Oscillator timing capacitor
12
CSY
External synchronizing signal
detection capacitor
13
SYNC
External synchronization input
14
CSO
PWM soft-start capacitor
15
REF
Reference voltage output (5V)
16
VCC
Power supply
FA5301BP(N)
2
s
Absolute maximum ratings
Item
Symbol
Rating
Unit
V
CC
22
V
V
O
22
V
I
OM
5
mA
V
I
5
V
V
IS
20
V
V
FB
20
V
V
ON/OFF
6
V
V
SYNC
6
V
P
d
1000 (DIP-16) *
1
mW
400 (SOP-16) *
2
T
opr
20 to +85
C
T
stg
40 to +150
C
Supply voltage
Output voltage
Error amplifier output
current
Error amplifier input
voltage
Overcurrent detection
terminal input voltage
Feedback terminal input voltage
Output ON/OFF terminal
input voltage
Synchronizing terminal
input voltage
Total power dissipation
Operating temperature
Storage temperature
Notes:
*
1
Derating factor Ta > 25
C : 10.0mW/
C (on PC board)
*
2
Derating factor Ta > 25
C : 4.0mW/
C (on PC board)
s
Recommended operating conditions
Item
Symbol
Min.
Max.
Unit
Supply voltage
V
CC
7
20
V
Error amplifier input voltage
V
I
0
V
REF
-2
V
Output current
I
O
20
mA
Error amplifier feedback resistor
R
NF
33
k
Oscillator timing capacitor
C
T
100
10,000
pF
Oscillator timing resistor
R
T
8.2
220
k
Free run oscillation frequency
f
OSC
1
200
kHz
Synchronized frequency
f
SYNC
1
200
kHz
Frequency ratio
CSY
=OV 35
5
%
f
OSC
f
SYNC
*
3
f
SYNC
30
+10
%
CSY
:
C
apacitor
is connected
to GND
*
3
Consider the tolerance of
fosc f
SYNC
f
SYNC
s
Electrical characteristics (Ta = 25
C, V
CC
= 9V, R
T
= 47k
, C
T
= 1000pF)
Reference voltage section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Output voltage
V
REF
I
OR
= 1mA
4.75
5.00
5.25
V
Line regulation
L
INE
V
CC
= 8 to 20V
10
25
mV
Load current regulation
L
OAD
I
OR
= 0.1 to 2mA
10
25
mV
Output voltage variation by temperature fluctuation
V
TC1
Ta
= 20 to +25
C
1
%
V
TC2
Ta
= +25 to +85
C
1
%
Output current at output short-circuit
I
OS
25
mA
Oscillator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
C
T
= 1,000pF,
R
T
= 47k
20
21
22
kHz
Frequency variation by line voltage fluctuation
f
dV
V
CC
= 8 to 20V
2
%
Frequency variation by temperature fluctuation
f
dt1
Ta
= +25 to 20
C
2
+2
%
f
dt2
Ta
= +25 to +85
C
2
+2
%
Input current to synchronizing signal terminal
I
SYNC1
V
SYNC
= 1V
300
600
A
I
SYNC2
V
SYNC
= 0.5V
60
300
A
Input current to synchronizing signal detection terminal
I
CSY1
Pin 12 = 0V,
V
SYNC
= 0.5V
65
130
260
A
I
CSY2
Pin 12 = 1V,
V
SYNC
= 1V
200
400
A
Threshold voltage of synchronizing signal detection terminal
V
TH CSY
0.7
1.0
V
Error amplifier section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input offset voltage
V
IO
10
10
mV
Input bias current
I
I
1
A
Common-mode input voltage
V
CM
0
V
REF
2 V
Open-loop voltage gain
A
V
70
95
dB
Unity-gain bandwidth
G
B
0.8
MHz
Common-mode signal rejection ratio
CMRR
80
dB
Maximum output voltage
V
OM+
I
OM
= 50
A
4
V
V
OM
I
OM
= 50
A
0.5
V
Output sink current
I
OM
V
OM
= 1V
170
240
A
FA5301BP(N)
3
PWM comparator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current (Pin 4)
I
BFB
V
FB
= 1V
2.0
10.0
A
Input threshold voltage (Pin 4)
V
TH0
Duty cycle = 0%
3.3
V
V
TH100
Duty cycle = 100%
0.2
V
Soft-start signal pin input current
I
CSO
Pin 14 = 3V,
V
FB
= 0V
2.0
10.0
A
Dead time adjustment circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current
I
BDT
Pin 10 = 1V
0.5
5
A
Input threshold voltage
V
TH DT0
Duty cycle = 0%
3.2
V
V
TH DT100
Duty cycle = 100%
0.1
V
Reset saturation voltage
V
SAT RS
Pin 10 = 100
A
0.25
0.8
V
Overcurrent limiting circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current (Pin 5)
I
BIS
V
IS
= 0.3V
1
A
Input threshold voltage (Pin 5)
V
TH IS
0.5
0.6
0.7
V
Source current of overcurrent cutoff terminal
I
O CD
Pin 6 = 0V,
V
IS
= 1V
450
700
A
Latch-mode threshold voltage
V
TH LA
1.8
2.2
2.6
V
Reset saturation voltage (Pin 6)
V
SAT RS
Pin 6 = 100
A,
V
IS
= 0V
0.75
1.0
V
Output section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Output leakage current
I
LEAK
V
O
= 22V, output OFF
10
A
L-level output voltage
V
OL
I
O
= 10mA
0.4
0.7
V
Output sink current limit
I
SINK
V
O
= 3V
25
40
55
mA
Output ON/OFF control circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input bias current (Pin 8)
I
BON
Pin 8 = 0V
60
300
A
OFF-to-ON threshold voltage
V
TH ON
OFF
ON
2.13
2.50
2.87
V
ON-to-OFF threshold voltage
V
TH OFF
ON
OFF
1.96
2.30
2.64
V
Voltage hysteresis
V
HYS
0.2
V
Overall device
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Supply current
I
CC LA
R
T
= 47k
, latch mode
8.0
12.0
mA
Operating-state supply current
I
CC AV
R
T
= 47k
, duty cycle = 50%
6.5
9.8
mA
FA5301BP(N)
4
s
Characteristic curves (Ta = 25
C)
Oscillation frequency (f
OSC
) vs. timing
Output duty cycle vs. DT terminal voltage (V
DT
)
resistor resistance (R
T
)
1
7
10
20
50
R
T
[k
]
100
200
500
2200pF
1500pF
1000pF
680pF
470pF
C
T
=100pF
10
5
100
50
fosc [kHz]
1000
500
Output duty cycle vs. FB terminal voltage (V
FB
)
L-level output voltage vs. output sink current (I
SINK
)
Supply current (I
CC
) vs. supply voltage (V
CC
)
Error amplifier frequency (f) vs.voltage gain(Av)/ phase (
)
FA5301BP(N)
5
s
Application circuit
Switching power supply (primary current control and insulated output type)
This circuit uses the following functions.
Horizontal synchronizing function
Overcurrent limiting function
Overcurrent cutoff function
Undervoltage input cutoff function
Soft-start function
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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