4
UC1825
UC2825
UC3825
UC1825
UC3825
PARAMETERS TEST CONDITIONS UC2825
MIN TOP MAX MIN TOP MAX UNITS
PWM Comparator Section
Pin 7 Bias Current V
PIN 7 = 0V -1 -5 -1 -5 µA
Duty Cycle Range 0 80 0 85 %
Pin 3 Zero DC Threshold V
PIN 7 = 0V 1.1 1.25 1.1 1.25 V
Delay to Output* 50 80 50 80 ns
Soft-Start Section
Charge Current V
PIN 8 = 0.5V 3 9 20 3 9 20 µA
Discharge Current V
PIN 8 = 1V 1 1 mA
Current Limit / Shutdown Section
Pin 9 Bias Current 0 < V
PIN 9 < 4V 15 10 µA
Current Limit Threshold 0.9 1.0 1.1 0.9 1.0 1.1 V
Shutdown Threshold 1.25 1.40 1.55 1.25 1.40 1.55 V
Delay to Output 50 80 50 80 ns
Output Section
Output Low Level I
OUT = 20mA 0.25 0.40 0.25 0.40 V
I
OUT = 200mA 1.2 2.2 1.2 2.2 V
Output High Level I
OUT = -20mA 13.0 13.5 13.0 13.5 V
I
OUT = -200mA 12.0 13.0 12.0 13.0 V
Collector Leakage V
C = 30V 100 500 10 500 µA
Rise/Fall Time* CL = 1nF 30 60 30 60 ns
Under-Voltage Lockout Section
Start Threshold 8.8 9.2 9.6 8.8 9.2 9.6 V
UVLO Hysteresis 0.4 0.8 1.2 0.4 0.8 1.2 V
Supply Current Section
Start Up Current V
CC = 8V 1.1 2.5 1.1 2.5 mA
ICC V
PIN 1, VPIN 7, VPIN 9 = 0V; VPIN 2 = 1V 22 33 22 33 mA
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for , RT = 3.65k, CT = 1nF, VCC
= 15V, -55°C<TA<125°C for the UC1825, –40°C<TA<85°C for the UC2825, and 0°C<TA<70°C for the UC3825, TA=TJ.
