Catalog(2 parts)
| Part | Fault Protection | Control Features | Supplier Device Package | Topology | Mounting Type | Voltage - Start Up▲▼ | Duty Cycle▲▼ | Package / Case | Package / Case▲▼ | Package / Case▲▼ | Operating Temperature▲▼ | Operating Temperature▲▼ | Internal Switch(s)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Package / Case▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments UC3851NConverter Offline Boost, Buck, Flyback, Forward Topology Up to 500kHz 18-PDIP | Current Limiting, Over Voltage | Frequency Control, Soft Start | 18-PDIP | Boost, Buck, Flyback, Forward | Through Hole | 8 V | 0.5 ul | 18-DIP | 0.007619999814778566 m | 0.007619999814778566 m | 70 °C | 0 °C | 32 V | 7.800000190734863 V | ||
Texas Instruments UC3851DWTRConverter Offline Boost, Buck, Flyback, Forward Topology Up to 500kHz 18-SOIC | Current Limiting, Over Voltage | Frequency Control, Soft Start | 18-SOIC | Boost, Buck, Flyback, Forward | Surface Mount | 8 V | 0.5 ul | 18-SOIC | 0.007493000011891127 m | 70 °C | 0 °C | 32 V | 7.800000190734863 V | 0.007499999832361937 m |
Key Features
• All Control, Driving, Monitoring, and Protection Functions IncludedLow-Current Off Line Start CircuitVoltage Feed Forward or Current Mode ControlHigh Current Totem Pole Output50% Absolute Max Duty CyclePWM Latch for Single Pulse Per PeriodPulse-by-Pulse Current Limiting plus Shutdown for Over-Current FaultNo Start-Up or Shutdown TransientsSlow Turn-On Both Initially and After Fault ShutdownShutdown Upon Over or Under Voltage SensingLatch Off or Continuous Retry After Fault1% Reference Accuracy500kHz Operation18 Pin DIL or 20 Pin PLCC PackageAll Control, Driving, Monitoring, and Protection Functions IncludedLow-Current Off Line Start CircuitVoltage Feed Forward or Current Mode ControlHigh Current Totem Pole Output50% Absolute Max Duty CyclePWM Latch for Single Pulse Per PeriodPulse-by-Pulse Current Limiting plus Shutdown for Over-Current FaultNo Start-Up or Shutdown TransientsSlow Turn-On Both Initially and After Fault ShutdownShutdown Upon Over or Under Voltage SensingLatch Off or Continuous Retry After Fault1% Reference Accuracy500kHz Operation18 Pin DIL or 20 Pin PLCC Package
Description
AI
The UC1851 family of PWM controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.
Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices can be configured for automatic restart, or latched off response to a fault.
These devices are packaged in 18-pin plastic or ceramic dual-in-line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55°C to +125°C operation while the UC2851 and UC3851 are designed for -40°C to +85°C and 0°C to +70°C, respectively.
The UC1851 family of PWM controllers are optimized for off-line primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.
Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices can be configured for automatic restart, or latched off response to a fault.
These devices are packaged in 18-pin plastic or ceramic dual-in-line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55°C to +125°C operation while the UC2851 and UC3851 are designed for -40°C to +85°C and 0°C to +70°C, respectively.