Key facts
- Brand
- Texas Instruments
- Model
- UC3823B
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-08
Start here
TEXAS INSTRUMENTS UC1823A UC2823A UC2823B UC3823A UC3823B UC1825A UC2825A UC2825B UC3825A UC3825B handbook(1)
The document describes the UC3823A/B and UC3825A/B families of PWM controllers, which are improved versions of the standard UC3823 and UC3825. These devices support both voltage-mode and current-mode control methods with practical operation up to 1 MHz switching frequencies. Key features include a high-current dual totem pole output capable of 2-A peak currents, pulse-by-pulse current limiting, and latched overcurrent protection.
Read onlineTexas Instruments UC3823B specifications
| Switching Frequency | to 1 MHz |
|---|---|
| Propagation Delay | 50 ns |
| Output Current (Peak) | 2 A |
| Error Amplifier Gain Bandwidth Product | 12 MHz |
| Input Offset Voltage | 2 mV |
| Current Limit Threshold Tolerance | 5% |
| Oscillator Discharge Current | 10 mA |
All Texas Instruments UC3823B documents by type
Ratings, dimensions and ordering codes, for selection and design work.
- TEXAS INSTRUMENTS UC1823A UC2823A UC2823B UC3823A UC3823B UC1825A UC2825A UC2825B UC3825A UC3825B handbook(1) 15 p
- TEXAS INSTRUMENTS UC1823A UC2823A UC2823B UC3823A UC3823B UC1825A UC2825A UC2825B UC3825A UC3825B handbook 15 p
- Texas Instruments UC3823A/UC3823B/UC3825A/UC3825B PWM Controller Data Sheet 18 p
Questions answered in these manuals
What are the UVLO thresholds for the 'B' versions?
The 'B' versions have UVLO thresholds of 16 V and 10 V, intended for ease of use in off-line applications.
What is the maximum duty cycle for UC3825A/B?
The UC3825A and UC3825B have dual alternating outputs with a duty cycle from zero to less than 100%.
What is the maximum switching frequency?
The device supports practical operation at switching frequencies up to 1 MHz.
Is there a restart delay after an overcurrent fault?
Yes, the latched overcurrent comparator includes a full cycle restart with a delay.
What is the startup supply current of the UC3823/UC3825 devices?
The typical startup supply current is about 100 µA.
From: Texas Instruments UC3823A/UC3823B/UC3825A/UC3825B PWM Controller Data Sheet
What is the maximum duty cycle supported?
The devices support a maximum duty cycle of 85 %.
From: Texas Instruments UC3823A/UC3823B/UC3825A/UC3825B PWM Controller Data Sheet