Datasheet UC1846, UC1847, UC2846 UC2847, UC3846, UC3847 (Texas Instruments) - 6

UC1846, UC1847 , UC2846 UC2847, UC3846 , UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
www.ti.com Electrical Characteristics (continued)
TA=–55°C to +125°C for UC1846/7; –40°C to +85°C for the UC2846/7; and 0°C to +70°C for the UC3846/7; VIN=15 V, RT=10k, CT=4.7 nF, TA=TJ (unless otherwise noted)
UC1846/7 UC3846/7 UC2846/7 PARAMETER TEST CONDITIONS UNIT MIN TYP MAX MIN TYP MAX
Maximum Differential Input Pin 1 Open (2); RL 1.1 1.2 1.1 1.2 V Signal (VPIN 4-VPIN 3) (Pin 7) = 15 kW VPIN 1 = 0.5 V, Pin 7 Input Offset Voltage 5 25 5 25 mV Open(2) CMRR VCM = 1 V to 12 V 60 83 60 83 dB PSRR VIN = 8 V to 40 V 60 84 60 84 dB VPIN 1 = 0.5 V, Pin 7 Input Bias Current –2.5 –10 –2.5 –10 µA Open(2) VPIN 1 = 0.5 V, Pin 7 Input Offset Current 0.08 1 0.08 1 µA Open(2) Input Common Mode Range 0 VIN-3 0 VIN-3 V Delay to Outputs TJ = 25°C (1) 200 500 200 500 ns
CURRENT LIMIT ADJUST
VPIN 3 = 0 V, VPIN 4 = Current Limit Offset 0.45 0.5 0.55 0.45 0.5 0.55 V 0 V, Pin 7 Open (2) VPIN 5 = VREF, VPIN 6 Input Bias Current –10 –30 –10 –30 µA = 0 V
SHUTDOWN TERMINAL
Threshold Voltage 250 350 400 250 350 400 mV Input Voltage Range 0 VIN 0 VIN V Minimum Latching Current (4)3.0 1.5 3.0 1.5 mA (IPIN1) Maximum Latching Current (5)1.5 0.8 1.5 0.8 mA (IPIN1) Delay to Outputs TJ = 25°C (1) 300 600 300 600 ns
OUTPUT
Collector-Emitter Voltage 40 40 V Collector Leakage Current VC = 40 V (6) 200 200 µA ISINK = 20 mA 0.1 0.4 0.1 0.4 Output Low Level V ISINK = 100 mA 0.4 2.1 0.4 2.1 ISOURCE = 20 mA 13 13.5 13 13.5 Output High Level V ISOURCE = 100 mA 12 13.5 12 13.5 CL = 1 nF, TJ = 25°C Rise Time (1) 50 300 50 300 ns CL = 1 nF, TJ = 25°C Fall Time (1) 50 300 50 300 ns
UNDERVOLTAGE LOCKOUT
Start-Up Threshold 7.7 8.0 7.7 8.0 V Threshold Hysteresis 0.75 0.75 V
TOTAL STANDBY CURRENT
Supply Current 17 21 17 21 mA (4) Current into Pin 1 ensured to latch circuit in shutdown state. (5) Current into Pin 1 ensured not to latch circuit in shutdown state. (6) Applies to UC1846/UC2846/UC3846 only due to polarity of outputs. 6 Submit Documentation Feedback Copyright © 1997–2015, Texas Instruments Incorporated Product Folder Links: UC1846 UC1847 UC2846 UC2847 UC3846 UC3847 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information 6.5 Electrical Characteristics 6.6 Typical Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Current Sense Amplifier 7.3.2 Oscillator 7.4 Device Functional Modes 7.4.1 Current Limit 7.4.2 Shutdown 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.2.1 Design Switching Frequency 8.2.2.2 Error Amplifier Output Configuration 8.2.2.3 Parallel Operation Configuration 8.2.2.4 Design Pulse by Pulse Current Limit Threshold 8.2.2.5 Soft-Start and Shutdown, Restart Function Design 8.2.3 Application Curves 9 Power Supply Recommendations 10 Layout 10.1 Layout Guidelines 10.2 Layout Example 11 Device and Documentation Support 11.1 Related Links 11.2 Community Resources 11.3 Trademarks 11.4 Electrostatic Discharge Caution 11.5 Glossary 12 Mechanical, Packaging, and Orderable Information