Overview
The UC3846N, produced by Texas Instruments, is a dual-ended 500 kHz current mode PWM (Pulse Width Modulation) controller. This device is part of the UC1846/7 family of control devices, designed to implement fixed-frequency, current-mode control schemes with a minimal external parts count. The UC3846N offers superior performance in terms of improved line regulation, enhanced load response characteristics, and a simpler control loop design. It is available in a PDIP (N) package with 16 pins and operates over a temperature range of 0°C to 70°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | PDIP (N) | - |
| Pins | 16 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage (Pin 15) | +40 | V |
| Collector Supply Voltage (Pin 13) | +40 | V |
| Output Current, Source or Sink (Pins 11, 14) | 500 | mA |
| Reference Output Current (Pin 2) | -30 | mA |
| Sync Output Current (Pin 10) | -5 | mA |
| Error Amplifier Output Current (Pin 7) | -5 | mA |
| Soft Start Sink Current (Pin 1) | 50 | mA |
| Oscillator Charging Current (Pin 9) | 5 | mA |
| Power Dissipation (TA=25°C) | 1000 | mW |
| Power Dissipation (TC=25°C) | 2000 | mW |
| Operation Frequency | 500 kHz | - |
Key Features
- Automatic Feedforward Compensation
- Programmable Pulse-by-Pulse Current Limiting
- Automatic Symmetry Correction in Push-Pull Configuration
- Enhanced Load Response Characteristics
- Parallel Operation Capability for Modular Power Systems
- Differential Current Sense Amplifier with Wide Common Mode Range
- Double-Pulse Suppression
- 500-mA (Peak) Totem-pole Outputs
- ±1% Band Gap Reference
- Undervoltage Lockout
- Soft-Start Capability
- Shutdown Terminal with complete shutdown and automatic restart or latch-off options
- Fully-latched operation
- Deadline adjust capability
Applications
- Telecommunication Power Converters
- Industrial Power Converters
- Off-line and DC-to-DC fixed-frequency power supplies
- Modular power systems requiring parallel operation
- Push-pull converters with automatic symmetry correction
Q & A
- What is the operating temperature range of the UC3846N?
The UC3846N operates over a temperature range of 0°C to 70°C.
- What is the maximum supply voltage for the UC3846N?
The maximum supply voltage for the UC3846N is +40 V.
- What is the peak output current of the UC3846N?
The peak output current of the UC3846N is 500 mA.
- Does the UC3846N have built-in undervoltage lockout?
Yes, the UC3846N has built-in undervoltage lockout.
- What is the operation frequency of the UC3846N?
The operation frequency of the UC3846N is 500 kHz.
- Can the UC3846N be used in parallel operation for modular power systems?
Yes, the UC3846N supports parallel operation capability for modular power systems.
- Does the UC3846N have a soft-start capability?
Yes, the UC3846N has a soft-start capability.
- What type of shutdown function does the UC3846N offer?
The UC3846N offers a shutdown function that can initiate either a complete shutdown with automatic restart or latch the supply off.
- Does the UC3846N feature automatic symmetry correction for push-pull converters?
Yes, the UC3846N features automatic symmetry correction for push-pull converters.
- What is the accuracy of the bandgap reference in the UC3846N?
The bandgap reference in the UC3846N has an accuracy of ±1%.
