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FA13842

Fuji Electric
Part Number FA13842
Manufacturer Fuji Electric
Description CMOS IC(For Switching Power Supply Control)
Published Mar 30, 2005
Detailed Description FA13842,13843,13844,13845 s Description The FA1384X series are CMOS current mode control ICs for off-line and DC-to-DC c...
Datasheet PDF File FA13842 PDF File

FA13842
FA13842

Overview
FA13842,13843,13844,13845 s Description The FA1384X series are CMOS current mode control ICs for off-line and DC-to-DC converters.
These ICs can reduce start-up circuit loss and are optimum for high efficiency power supplies because of the low power dissipation achieved through changes in the CMOS fabrication process.
These ICs can drive a power MOSFET directly.
The high-performance, compact power supply can be designed with minimal external components .
CMOS IC FA13842,Power 13843, 13844, 13845 For Switching Supply Control s Dimensions, mm SOP-8 8 5 1 4 4.
9 +0.
1 –0.
05 s Features • • • • • • • CMOS process Low-power dissipation Standby current 2µA (max.
), start-up current 30µA (max.
) Pulse-by-pulse current limiting 5V bandgap reference UVLO (Undervoltage lockout) with hysteresis Maximum duty cycle FA13842, 13843: 96% FA13844, 13845: 48% • Pin-for-pin compatible with UC384X Note: Pins are fully compatible, but characteristics are not.
When our ICs are applied to a power supply circuit designed for other manufactures' 384X series, the characteristics and safety features of the power supply must be checked.
6.
0±0.
2 3.
9 0.
4±0.
1 1.
27±0.
2 DIP-8 8 5 s Types of FA1384X series Type UVLO Start threshold Stop threshold FA13842P 16.
5V± 1V 9V± 1V FA13842N FA13843P 9.
6V± 1V 9V± 1V FA13843N FA13844P 16.
5V± 1V 9V± 1V FA13844N FA13845P FA13845N 9.
6V± 1V 9V± 1V Maximum duty Package cycle 96% DIP SOP 96% DIP SOP 48% DIP SOP 48% DIP SOP 1 9.
3 1.
5 4 6.
4 3.
0min 4.
5max 3.
3 0~8° 0.
05 0.
25 – +0.
1 7.
62 2.
54±0.
25 0.
46±0.
1 0~15 ˚ 0~1 5˚ 1.
7max 0.
20 1 FA13842, 13843, 13844, 13845 s Block diagram FA13842, 13843 VCC 7 30V UVLO OUTPUT ENB Pin No.
Symbol Function 1 COMP Compensating UVLO VCC 5V REF ENB 2.
5V 8 VREF 2 3 4 FB ISNS RT/CT 6 OUT RT/CT 4 ER AMP FB 2 COMP 1 ISNS 3 2R 1R OSC 5 GND 1V S Q FF R QB 5 6 7 8 GND OUT VCC VREF 5V Controlled block FA13844, 13845 VCC 7 30V UVLO OUTPUT ENB Description Error amplifier output, available for loop compensation...


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