UC3825N

Operating Supply Current :
Operating Supply Voltage : 30 V
Mounting Style : Through Hole
Fall Time : 30 ns
Number of Outputs : 2
Switching Frequency : 1000 KHz
Package / Case : PDIP-16
Maximum Operating Temperature : + 70 C
Rise Time : 30 ns
Duty Cycle (Max) : 85 %


Description

The UC3825N is optimized for high frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. The feature of UC3825N are as follows: (1)compatible with voltage or current mode topologies; (2)practical operation switching frequencies to 1MHz; (3)50ns propagation delay to output; (4)high current dual totem pole outputs (1.5A Peak); (5)wide bandwidth error amplifier; (6)fully latched logic with double pulse suppression; (7)pulse-by-pulse current limiting; (8)soft start / max. duty cycle control; (9)under-voltage lockout with hysteresis; (10)low start up current (1.1mA).
 
The absolute maximum ratings of the UC3825N are: (1)supply voltage (Pins 13, 15): 30V; (2)output current, source or sink (Pins 11, 14); (3)DC: 0.5A, pulse (0.5  s): 2.0A; (4)analog inputs: -0.3V to 7V; (5)clock output current (Pin 4): -5mA; (6)error amplifier output current (Pin 3): 5mA; (7)soft start sink current (Pin 8): 20mA; (8)oscillator charging current (Pin 5): -5mA; (9)power dissipation: 1W; (10)storage temperature range: -65°C to +150°C; (11)lead temperature (soldering, 10 seconds): 300°C.

The following is about the electrical characteristics of UC3825N: (1)output voltage: 5.00V min, 5.10V typical and 5.20V max at TJ=25, IO=1mA; (2)line regulation: 2mV typical and 20mV max at 10V<Vcc<30V; (3)load regulation: 5mV typical and 20mV max at 1mA<IO<10mA; (4)temperature stability*: 0.2mV/ typical and 0.4mV/ max at TMIN<TA<TMAX; (5)total output variation*: 4.95V min and 5.25V max line, load, temperature; (6)output noise voltage: 50V at at 10HZ<f<10kHZ; (7)long term stability*: 5mV typical and 25mV max at TJ=125, 1000hrs; (8)short circuit current: -15mA min, -50mA typical and -100mA max at VREF=0V; (9)initial accuracy*: 360kHZ min, 400kHZ typical and 440kHZ max at TJ=2.