Product Summary

The UC2825ADW is a PWM controller. Performance enhancements have been made to several of the circuit blocks. Error amplifier gain bandwidth product is 12 MHz, while input offset voltage is 2 mV. Current limit threshold of the UC2825ADW is assured to a tolerance of 5%. Oscillator discharge current is specified at 10 mA for accurate dead time control. Frequency accuracy is improved to 6%. Startup supply current, typically 100 µA, is ideal for off-line applications. The UC2825ADW output drivers are redesigned to actively sink current during UVLO at no expense to the startup current specification. In addition each output is capable of 2-A peak currents during transitions.

Parametrics

UC2825ADW absolute maximum ratings: (1)VIN, Supply voltage: 22 V; (2)IO, Source or sink current: 0.5 A; (3)IO, Source or sink current, pulse (0.5 μs) OUTA, OUTB: 2.2 A; (4)Analog inputs, INV, NI, RAMP: -0.3 V to 7 V; (5)Analog inputs, ILIM, SS: -0.3 V to 6 V; (6)Power ground PGND: ±0.2 V; (7)ICLK, Clock output current CLK/LEB: -5 mA; (8)IO(EA), Error amplifier output current EAOUT: 5 mA; (9)ISS, Soft-start sink current SS: 20 mA; (10)IOSC, Oscillator charging current RT: -5 mA; (11)TJ, Operating virtual junction temperature range: -55 to 150℃; (12)Tstg, Storage temperature: -65 to 150℃; (13)Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: -55 to 150℃; (14)tSTG, Storage temperature: -65 to 150℃; (15)Lead temperature 1,6 mm (1/16 inch) from cases for 10 seconds: 300℃.

Features

UC2825ADW features: (1)Improved Versions of the UC3823/UC3825 PWMs; (2)Compatible with Voltage-Mode or Current-Mode Control Methods; (3)Practical Operation at Switching Frequencies to 1 MHz; (4)50-ns Propagation Delay to Output; (5)High-Current Dual Totem Pole Outputs (2-A Peak); (6)Trimmed Oscillator Discharge Current; (7)Low 100-μA Startup Current; (8)Pulse-by-Pulse Current Limiting Comparator; (9)Latched Overcurrent Comparator With Full Cycle Restart.

Diagrams

UC2825ADW block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
UC2825ADW
UC2825ADW

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $4.42
1-25: $4.12
25-100: $3.71
100-250: $3.41
UC2825ADWG4
UC2825ADWG4

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1: $4.42
1-25: $3.72
25-100: $3.42
100-250: $3.08
UC2825ADWTR
UC2825ADWTR

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1510: $2.23
1510-2000: $2.15
UC2825ADWTRG4
UC2825ADWTRG4

Texas Instruments

Current Mode PWM Controllers High Speed PWM Controller

Data Sheet

0-1510: $2.23
1510-2000: $2.15