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询价
产品信息
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 RO 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.