| Topology | Boost, Flyback, Forward |
| Duty cycle (Max) (%) | 100 |
| Vin (Max) (V) | 30 |
| UVLO thresholds on/off (V) | 8.4/7.6 |
| Features | Error Amplifier, Multi-topology |
| Operating temperature range (C) | -55 to 125 |
| Switching frequency (Max) (kHz) | 500 |
| Rating | Space |
| Gate drive (Typ) (A) | 1 |
- QML-V Qualified, SMD 5962-86704
- Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free)(1)
- Controlled Baseline
- Optimized For Off-line and DC-to-DC Converters
- Low Start-Up Current (<1 mA)
- Automatic Feed Forward Compensation
- 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
(1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details.
The UC1843 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. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%.
