Overview
The UC3825DWTRG4 is a high-speed PWM (Pulse Width Modulation) controller from Texas Instruments, designed for high-frequency switched-mode power supply applications. This device is part of the UC3825 family, which is optimized for performance in voltage or current mode topologies. Although the UC3825 series is now obsolete, it remains relevant for legacy systems and specific design requirements.
The UC3825DWTRG4 features a robust set of functionalities, including high current dual totem pole outputs, a wide bandwidth error amplifier, and fully latched logic with double pulse suppression. It also includes pulse-by-pulse current limiting, soft start/max duty cycle control, and under-voltage lockout with hysteresis.
Key Specifications
| Parameter | Min | Max | Units | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 8 | 30 | V | |
| Operating Temperature Range | 0 | 70 | °C | |
| Reference Output Voltage | 5.00 | 5.10 | 5.20 | V |
| Line Regulation | 2 | 20 | mV | |
| Load Regulation | 5 | 20 | mV | |
| Oscillator Frequency | 340 | 460 | kHz | |
| Output High Level (IOUT = -20mA) | 13.0 | 13.5 | V | |
| Output Low Level (IOUT = 20mA) | 0.25 | 0.40 | V | |
| Start-Up Current (VCC = 8V) | 1.1 | 2.5 | mA | |
| Under-Voltage Lockout Start Threshold | 8.8 | 9.6 | V |
Key Features
- Compatible with voltage or current mode topologies
- Practical operation at switching frequencies up to 1 MHz
- 50 ns propagation delay to output
- High current dual totem pole outputs (1.5 A peak)
- Wide bandwidth error amplifier
- Fully latched logic with double pulse suppression
- Pulse-by-pulse current limiting
- Soft start / max duty cycle control
- Under-voltage lockout with hysteresis
- Low start-up current (1.1 mA)
Applications
The UC3825DWTRG4 is designed for high-frequency switched-mode power supply applications, including:
- Voltage mode and current mode power supplies
- Forward and flyback converters
- Half-bridge and full-bridge converters
- DC-DC converters requiring high precision and reliability
Q & A
- What is the operating temperature range of the UC3825DWTRG4?
The operating temperature range is from 0°C to 70°C.
- What is the maximum switching frequency of the UC3825DWTRG4?
The device can operate at switching frequencies up to 1 MHz.
- What is the propagation delay to output for the UC3825DWTRG4?
The propagation delay to output is 50 ns.
- What is the peak output current of the UC3825DWTRG4?
The device has high current dual totem pole outputs with a peak current of 1.5 A.
- Does the UC3825DWTRG4 have under-voltage lockout?
- What is the start-up current of the UC3825DWTRG4?
The start-up current is 1.1 mA at VCC = 8V.
- Is the UC3825DWTRG4 RoHS compliant?
- What are the package options for the UC3825DWTRG4?
The device is available in SOIC-16 (DW) package.
- Is the UC3825DWTRG4 still in production?
No, the UC3825 series is obsolete and no longer in production.
- What are some common applications for the UC3825DWTRG4?
Common applications include voltage mode and current mode power supplies, forward and flyback converters, and DC-DC converters.
