UC3842 datasheet(8/11 Pages) STMICROELECTRONICS

Part #	UC3842

Description	CURRENTMODE PWM CONTROLLER

Download	11 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

Logo

8 / 11 page

Figure 11 : Off-line Flyback Regulator.

Power Supply Specifications

1. Input Voltage :

95 VAC to 130 VAC

(50 Hz/60 Hz)

2. Line Isolation :

3750 V

3. Switching Frequency :

40 KHz

4. Efficiency @ Full Load : 70 %

5. Output Voltage :

A. + 5 V,

± 5 % : 1 A to 4 A load

Ripple voltage : 50 mV P-P Max.

B. + 12 V,

± 3 % : 0.1 A to 0.3 A load

Ripple voltage : 100 mV P-P Max.

C. – 12 V,

± 3 % : 0.1 A to 0.3 A load

Ripple voltage : 100 mV P-P Max.

Figure 12 : Slope Compensation.

A fraction of the oscillator ramp can be resistively

summed with the current sense signal to provide

slope compensation for converters requiring duty

cycles over 50 %.

Note that capacitor, C, forms a filter with R2 to su-

press the leading edge switch spikes.

UC2842/3/4/5-UC3842/3/4/5

8/11

Similar Part No. - UC3842

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	UC3842	74Kb / 8P	Current-mode PWM controller August 31, 1994
Texas Instruments	UC3842	693Kb / 28P	CURRENT MODE PWM CONTROLLER
STMicroelectronics	UC3842	129Kb / 15P	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Fairchild Semiconductor	UC3842	133Kb / 12P	SMPS Controller
STMicroelectronics	UC3842	135Kb / 15P	HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Manufacturer	Part #	Datasheet	Description
ON Semiconductor	NCP1249C	1Mb / 33P	High-Voltage CurrentMode PWM Controller Featuring Peak Power Excursion September, 2013 ??Rev. 0
Taiwan Semiconductor Co...	TS2581	139Kb / 7P	PWM Controller
SANYO DENKI CO., LTD.	9PC8666X-S001	371Kb / 4P	PWM Controller
ON Semiconductor	FAN6756	1Mb / 21P	PWM Controller Rev. 2.0.0
TOKO, Inc	TK75001	102Kb / 13P	PWM CONTROLLER
TOKO, Inc	TK75003	108Kb / 14P	PWM CONTROLLER
ON Semiconductor	FAN6605	1Mb / 18P	PWM Controller January 2015 Rev. 1.0
Samsung semiconductor	KA7552	90Kb / 5P	PWM CONTROLLER
Princeton Technology Co...	AS2916	63Kb / 8P	PWM Controller
ON Semiconductor	FAN6757	1Mb / 19P	PWM Controller Rev. 1.0.1