UC3825BN ,High Speed PWM ControllerSLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010These devices have limited built-in ESD protection. ..
UC3825DW ,High Speed PWM ControllerapplicationUC1825INFOUC2825availableUC3825High Speed PWM Controller
UC3825DWTR ,High Speed PWM ControllerapplicationUC1825INFOUC2825availableUC3825High Speed PWM Controller
UC3825DWTRG4 ,High Speed PWM ControllerapplicationUC1825INFOUC2825availableUC3825High Speed PWM Controller
UC3825J , High Speed PWM Controller
UC3825N ,High Speed PWM ControllerapplicationUC1825INFOUC2825availableUC3825High Speed PWM Controller
UMH14 N , General purpose (dual digital transistors)
UMH15N , NPN Multi-Chip Built-in Resistors Transistor
UMH1N , General purpose transistors (dual transistors)
UMH1N , General purpose transistors (dual transistors)
UMH2N , NPN 100mA 50V Complex Digital Transistors (Bias Resistor Built-in Transistors)
UMH2N , NPN 100mA 50V Complex Digital Transistors (Bias Resistor Built-in Transistors)
UC3825BDW-UC3825BN
High Speed PWM Controller
UC1823A, UC2823A, UC2823B,
UC3823A, UC3823B, UC1825A,
UC2825A, UC2825B, UC3825A, UC3825B
SLUS334E − AUGUST 1995 − REVISED SEPTEMBER 2010
HIGH-SPEED PWM CONTROLLER
FEATURES Improved Versions of the UC3823/UC3825PWMs Compatible with Voltage-Mode orCurrent-Mode Control Methods Practical Operation at Switching Frequenciesto 1 MHz 50-ns Propagation Delay to Output High-Current Dual Totem Pole Outputs(2-A Peak) Trimmed Oscillator Discharge Current Low 100-μA Startup Current Pulse-by-Pulse Current Limiting Comparator Latched Overcurrent Comparator With FullCycle Restart
DESCRIPTIONThe UC3823A and UC3823B and the UC3825A andUC3825B family of PWM controllers are improved
versions of the standard UC3823 and UC3825 family.Performance enhancements have been made to several
of the circuit blocks. Error amplifier gain bandwidth productis 12 MHz, while input offset voltage is 2 mV . Current limitthreshold is assured to a tolerance of 5%. Oscillator
discharge current is specified at 10 mA for accurate deadtime control. Frequency accuracy is improved to 6%.
Startup supply current, typically 100 μA, is ideal for off-lineapplications. The output drivers are redesigned to actively
sink current during UVLO at no expense to the startupcurrent specification. In addition each output is capable of
2-A peak currents during transitions.
BLOCK DIAGRAM
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