PWM开关电源集成控制器

	UC2842	UC3842
Topology	Boost, Flyback, Forward	Boost, Buck, Flyback, Forward
Control Method	Current Mode	Current Mode
Duty Cycle(Max)(%)	100	100
Frequency(Max)(kHz)	450	450
UVLO Thresholds On/Off(V)	16/10	16/10
Pin/Package	14SOIC, 8PDIP, 8SOIC	14SOIC, 8PDIP, 8SOIC
Regulated Outputs(#)	1	1
Operating Temperature Range(°C)	-40 to 85	0 to 70

特性

• Optimized For Off-line and DC-to-DC Converters
• Low Start-Up Current (<1 mA)
• Automatic Feed ForwardCompensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Under-Voltage Lockout With Hysteresis
• Double Pulse Suppression
• High Current Totem Pole Output
• Internally Trimmed Bandgap Reference
• 500-kHz Operation
• Low R_O Error Amp

说明

The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.

企业名：深圳市广辉电子有限公司

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地址：广东深圳深圳市深南东路金城大厦3-10-A//柜台:深圳市华强北路新华强电子世界Q3B026室