UC1843A-SP PWM controller Datasheet

UC1843A-SP Datasheet, PDF, Equivalent


Part Number

UC1843A-SP

Description

current-mode PWM controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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UC1843A-SP
SLUSCI6A – DECEMBER 2016 – REVISED FEBRUARY 2019
UC1843A-SP QML class V, radiation hardened current-mode PWM controller
1 Features
1 QML Class V (QMLV) Qualified, SMD 5962-86704
• 5962P8670409Vxx:
– Radiation Hardness Assurance (RHA) up to
30-krad(Si) Total Ionizing Dose (TID)
– Passes Functional and Specified Post-
Radiation Parametric Limits at 45 krad at LDR
(10 mrad(Si)/s) per 1.5× Over Test as Defined
in MIL-STD-883 Test Method 1019.9
Paragraph 3.13.3.b
– Exhibits Low-Dose Rate Sensitivity but
Remains Within the Pre-Radiation Electrical
Limits at 30-krad Total Dose Level, as Allowed
by MIL-STD-883, TM1019
• Optimized for Offline and DC-to-DC Converters
• Low Start-Up Current (< 0.5 mA)
• Trimmed Oscillator Discharge Current
• Automatic Feed Forward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Undervoltage Lockout (UVLO) With Hysteresis
• Double-Pulse Suppression
• High-Current Totem-Pole Output
• Internally-Trimmed Bandgap Reference
• 500-kHz Operation
• Low RO Error Amplifier
2 Applications
• DC-DC Converters
• Supports Various Topologies:
– Flyback, Forward, Buck, Boost
– Push-Pull, Half-Bridge, Full-Bridge With
External Interface Circuit
• Available in Military Temperature Range (–55°C to
125°C)
3 Description
The UC1843A-SP control IC is a radiation hardened
pin-for-pin compatible version of the UC184x family.
Providing the necessary characteristics to control
current-mode switched-mode power supplies, this
device has improved features. Start-up current is
specified to be less than 0.5 mA and oscillator
discharge is trimmed to 8.3 mA. During UVLO, the
output stage can sink at least 10 mA at less than 1.2
V for VCC over 5 V.
The Device Comparison Table shows the difference
between members of this family. Reference the
individual product data sheets for ordering the
radiation-improved version if available.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
CDIP (8)
6.67 mm × 9.60 mm
UC1843A-SP
LCCC (20)
8.89 mm × 8.89 mm
CFP (10)
6.48 mm × 7.02 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VCC 7
Gnd 5
RT/CT 4
VFB 2
Comp 1
C/S 3
34 V
UVLO
S/R
5-V
REF
2.5 V
Osc
VREF
Good
Logic
Internal
Bias
Error
Amplifier
2R S
R 1V
R PWM
Latch
Current
Sense
Comparator
8 VREF
5.0 V
50 mA
7 VC
6 Output
5 Pwr
Ground
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.

UC1843A-SP
UC1843A-SP
SLUSCI6A – DECEMBER 2016 – REVISED FEBRUARY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 6
8 Detailed Description .............................................. 7
8.1 Overview ................................................................... 7
8.2 Functional Block Diagram ......................................... 7
8.3 Feature Description................................................... 7
8.4 Device Functional Modes........................................ 12
9 Application and Implementation ........................ 13
9.1 Application Information............................................ 13
9.2 Typical Application .................................................. 13
10 Power Supply Recommendations ..................... 21
11 Layout................................................................... 21
11.1 Layout Guidelines ................................................. 21
11.2 Layout Example .................................................... 23
12 Device and Documentation Support ................. 24
12.1 Receiving Notification of Documentation Updates 24
12.2 Community Resources.......................................... 24
12.3 Trademarks ........................................................... 24
12.4 Electrostatic Discharge Caution ............................ 24
12.5 Glossary ................................................................ 24
13 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
Changes from Original (December 2016) to Revision A
Page
• Changed the Pin Configuration images ................................................................................................................................. 3
• Changed CT (pF) To: CT (µF) in Equation 1........................................................................................................................ 15
2 Submit Documentation Feedback
Copyright © 2016–2019, Texas Instruments Incorporated
Product Folder Links: UC1843A-SP


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity UC1843A-SP SLUSCI6A – DECEMBE R 2016 – REVISED FEBRUARY 2019 UC1843 A-SP QML class V, radiation hardened cu rrent-mode PWM controller 1 Features 1 QML Class V (QMLV) Qualified, SMD 5 962-86704 • 5962P8670409Vxx: – Radi ation Hardness Assurance (RHA) up to 30 -krad(Si) Total Ionizing Dose (TID) – Passes Functional and Specified PostRa diation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Tes t as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b – Exhibits Low-Dose Rate Sensitivity but Remains Within the Pre-Radiation Electrical Lim its at 30-krad Total Dose Level, as All owed by MIL-STD-883, TM1019 • Optimiz ed for Offline and DC-to-DC Converters • Low Start-Up Current (< 0.5 mA) • Trimmed Oscillator Discharge Current Automatic Feed Forward Compensation • Pulse-by-Pulse Current Limiting • Enhanced Load Response Characteristics • Undervoltage Lockout (UVLO) With Hysteresis • Do.
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