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UC3842 Datasheet(PDF) 4 Page - NXP Semiconductors |
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UC3842 Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 8 page Philips Semiconductors Linear Products Product specification UC3842 Current-mode PWM controller August 31, 1994 1103 DC AND AC ELECTRICAL CHARACTERISTICS 0 ≤TJ≤70°C for UC3842; VCC=154; RT=10kΩ; CT=3.3nF, unless otherwise specified SYMBOL PARAMETER TEST CONDITIONS UC3842 UNIT SYMBOL PARAMETER TEST CONDITIONS Min Typ Max UNIT Output section VOL Output Low-Level ISINK=20mA 0.1 0.4 V VOL Output Low-Level ISINK=200mA 1.5 2.2 V VOH Output High-Level ISOURCE=20mA 13 13.5 V VOH Output High-Level ISOURCE=200mA 12 13.5 V tR Rise time CL=1nF 50 150 ns tF Fall time CL=1nF 50 150 ns Undervoltage lockout section Start threshold 14.5 16 17.5 V Min. operating voltage after turn on 8.5 10 11.5 V PWM section Maximum duty cycle 93 97 100 % Minimum duty cycle 0 % Total standby current Start-up current 0.5 1 mA ICC Operating supply current VPIN 2=VPIN 3=0V 11 17 mA VCC zener voltage ICC=25mA 34 V Maximum operating frequency section Maximum operating frequency for all functions operating cycle-by-cycle 400 kHz NOTES: 1. These parameters, although guaranteed, are not 100% tested in production. 2. Parameter measured at trip point of latch with VPIN 2=0. 3. Gain defined as: A + DV PIN 1 DV PIN 3 ; 0 v V PIN 3 v 0.8V UNDERVOLTAGE LOCKOUT UC3842 VON 16V VOFF 10V NOTE: During Undervoltage Lock-Out, the output driver is biased to a high impedance state. Pin 6 should be shunted to ground with a bleeder resistor to prevent activating the power switch with output leakage current. 7 VCC ON/OFF COMMAND TO REST OF IC VCC VOFF VON ICC <15mA <1mA ERROR AMP CONFIGURATION NOTE: Error AMP can source or sink up to 0.5mA. 2.5V 0.5mA 2 1 COMP VFB ZI + – |
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