FC3255 Datasheet, PDF (1/18 Pages) First Components International – 1.5A PWM Switching Regulators

FC3255 1.5A PWM Switching Regulators
Description
Features
3255 products are 280 kHz switching regulators with a
high efficiency, 1.5 A integrated switch. These parts oper-
ate over a wide input voltage range, from 2.7 V to 30 V.
The flexibility of the design allows the chips to operate in
most power supply configurations, including boost, flyback,
forward, inverting, and SEPIC. The ICs utilize current
mode architecture, which allows excellent load and line reg-
ulation, as well as a practical means for limiting current.
Combining high frequency operation with a highly inte-
grated regulator circuit results in an extremely compact
power supply solution. The circuit design includes provi-
sions for features such as frequency synchronization, shut-
down, and feedback controls for either positive or negative
voltage regulation.
Integrated Power Switch: 1.5 A Guaranteed
Input Voltage Range: 2.7 V to 30 V
High Frequency Allows for Small Components
Minimum External Components
Easy External Synchronization
Built in Overcurrent Protection
Frequency Foldback Reduces Component
Stress During an Overcurrent Condition
Thermal Shutdown with Hysteresis
Regulates Either Positive or Negative Output
Voltages
Shut Down Current: 50 µA Maximum
Wide Temperature Range Commercial
Commercial Grade : 0 to 70°C (3255)
Application
Boost Regulators
CCFL Backlight Driver
Laptop Computer Supplies
TYPICAL APPLICATION CIRCUITS
Multiple Output Flyback Supplies
Inverting Supplies
TFT LCD Bias Supplies
R2
3.72K
C1
0.01µF
SS
3255
1
V_C
V_SW ⁸
2 _{FB PGND} 7
3
6
Test AGND
4 _SS
V_CC ⁵
3.3V
R1
5k
R3
1.28k
+C2
22µF
D1
MBRS120T3
V_OUT
5V
L1
22µH
+C3
22µF