(China (Mainland))
Product Summary
The UC3825N is a high speed 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 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 UC3825N is 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
UC3825N absolute maximum ratings: (1)Supply voltage, VC, VCC, VIN: 22 V; (2)Source or sink current, DC OUTA, OUTB, IO: 0.5 A; (3)Source or sink current, pulse (0.5 μs) OUTA, OUTB, IO: 2.2 A; (4)Analog inputs, INV, NI, RAMP: -0.3 V to 7 V; ILIM, SS: -0.3 V to 6 V; (5)Power ground, PGND: ±0.2 V; (6)Clock output current CLK/LEB, ICLK: -5 mA; (7)Error amplifier output current EAOUT, IO(EA): 5 mA; (8)Soft-start sink current, SS, ISS: 20 mA; (9)Oscillator charging current, RT, IOSC: -5 mA; (10)Operating virtual junction temperature range, TJ: -55℃ to 150℃; (11)Storage temperature, Tstg: -65℃ to 150℃; (12)Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: -55℃ to 150℃; (13)Storage temperature, tSTG: -65℃ to 150℃; (14)Lead temperature 1,6 mm (1/16 inch) from cases for 10 seconds: 300℃.
Features
UC3825N 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
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 UC3825N |
Texas Instruments |
Current Mode PWM Controllers High Speed PWM Controller |
Data Sheet |
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UC3825NG4 |
Texas Instruments |
Current Mode PWM Controllers High Speed PWM Controller |
Data Sheet |
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