FA551 Datasheet, PDF (1/22 Pages) List of Unclassifed Manufacturers – CMOS IC For Switching Power Supply Control

FA551X series
CMOS IC
For Switching Power SupplyFCAo5n5tr1oXl
FA5510P (N), FA5511P (N)
FA5514P (N), FA5515P (N)
■ Description
The FA551X series are the PWM type switching power supply
control ICs that can directly drive power MOSFET. These ICs
use a CMOS device with high dielectric strength (30V) to
implement low power consumption. These ICs contain many
function in a small 8-pin package. With these ICs, a high-
performance and compact power supply can be created
because not many external discrete components are needed.
■ Features
• Low current consumption by CMOS process with high
dielectric strength (30V)
• Standby current of 2µA or less (at Vcc=14V), and operating
current of 1.5mA (typ)
• Overvoltage protection function detecting the Vcc voltage
• A drive circuit for connecting a power MOSFET directly
• Output peak current: ±1.5A
• Pulse-by-pulse overcurrent limiting function
• Overload protection function (latch or non-latch mode selectable)
• Output ON-OFF function by external signal
• Latch-mode overvoltage shutdown function
• Undervoltage lockout function (16.5V ON / 9V OFF)
• Reference voltage output (5V)
• 8-pin package (DIP/SOP)
■ Block diagram
FA5510P (N), FA5511P (N)
CS(8)
VCC(6)
REF
(7)
5V VCC
ENB
5V REF
3.5V
FB
(2)
Dmax
FA5510: 46%
FA5511: 70%
0.8V/0.68V ^5.2µA
0.95mA
15.5V
15.5V ^UVLO
8.5V/7.9V
0.8V
4V
PWM
16.5V/9V
ENB
OUT
(5)
OUT
PUT
OSC
RT CT
+0.24V
R
QB
SQ
FF
GND
(4)
5V Controlled block
RT(1) IS+(3)
FA5514P (N), FA5515P (N)
CS(8)
VCC(6)
REF
(7)
5V VCC
ENB
5V REF
3.5V
FB
(2)
Dmax
FA5514: 46%
FA5515: 70%
0.8V/0.68V ^5.2µA
0.95mA
15.5V
15.5V ^UVLO
8.5V/7.9V
0.8V
4V
PWM
16.5V/9V
ENB
OUT
(5)
OUT
PUT
OSC
RT CT
-0.17V
R
QB
SQ
FF
GND
(4)
5V Controlled block
RT(1)
IS-(3)
■ Dimensions, mm
SOP-8
8
5
1
4
4.9
0.4^±0.1 1.27
DIP-8
8
5
1 _9.3 4
1.5^±0.3
2.54
0.46^±0.1
7.62
0~15˚
0.25^{+–00.1.05}
0~15˚
Pin Pin
Function
No. symbol
1 RT
Oscillator timing
resistor
2 FB
Feedback
3 IS
Overcurrent
detection
4 GND Ground
5 OUT Output
6 VCC
7 REF
8 CS
Power supply
Reference voltage
Soft-start and
ON/OFF control
Description
Setting oscillation frequency
Input of PWM comparator
Input of the overcurrent
limiting function
Ground
Output for driving a power
MOSFET
Power supply
Reference voltage output (5V)
Soft-start, ON/OFF function and
latch-mode shutdown operations
Type
FA5510P
FA5510N
FA5511P
FA5511N
FA5514P
FA5514N
FA5515P
FA5515N
Max. duty
cycle (typ.)
46%
70%
46%
70%
Polarity of overcurrent Package
detection
+
DIP-8
SOP-8
+
DIP-8
SOP-8
–
DIP-8
SOP-8
–
DIP-8
SOP-8
1