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UC1842A

Texas Instruments
Part Number UC1842A
Manufacturer Texas Instruments
Description Current-Mode PWM Controllers
Published Oct 16, 2019
Detailed Description UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A SLUS224G – SEPT...
Datasheet PDF File UC1842A PDF File

UC1842A
UC1842A

Overview
UC1842A, UC1843A, UC1844A, UC1845A UC2842A, UC2843A, UC2844A, UC2845A UC3842A, UC3843A, UC3844A, UC3845A SLUS224G – SEPTEMBER 1994 – REVISED JULY 2022 UCx84xA Current-Mode PWM Controller 1 Features • Optimized for Off-Line and DC-DC Converters • Low Start-Up Current (< 0.
5 mA) • Trimmed Oscillator Discharge Current • Automatic Feedforward Compensation • Pulse-by-Pulse Current Limiting • Enhanced Load Response Characteristics • Undervoltage Lockout With Hysteresis • Double Pulse Suppression • High-Current Totem Pole Output • Internally-Trimmed Bandgap Reference • Up to 500-kHz Operation • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer 2 Applications • Switch Mode Power Supplies (SMPS) • DC-DC Converters • Power Modules • Industrial PSU • Battery Operated PSU 3 Description The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family.
Providing the necessary features to control currentmode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.
5 mA, oscillator discharge is trimmed to 8.
3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.
2 V for VCC over 5 V.
Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) UC1842A, UC1843A, UC1844A, UC1845A CDIP (8) LCCC (20) 6.
67 mm × 9.
60 mm 8.
89 mm × 8.
89 mm UC2843A PLCC (20) 8.
96 mm × 8.
96 mm UC2842A, UC2843A, UC2844A, UC2845A, UC3842A, UC3843A, UC3844A, UC3845A PDIP (8) SOIC (8) SOIC (14) SOIC (16) 6.
35 mm × 9.
81 mm 3.
91 mm × 4.
90 mm 3.
91 mm × 8.
65 mm 7.
50 mm × 10.
30 mm (1) For all available packages, see the orderable addendum at the end of the data sheet.
DEVICE UC1842A UC1843A UC1844A UC1845A Device Comparison Table UVLO ON UVLO OFF MAX DUTY CYCLE 16 V 10 V <100% 8.
4 V 7.
6 V <100% 16 V 10 V <50% 8.
4 V 7.
6 V <50% VIN VCC OUTPUT VREF ISENSE UC2843A FB RT/CT GND COMP Copyright © 2017, Texas Instruments Incorporated Simplified...


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