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UC1846-SP Datasheet Preview

UC1846-SP Datasheet

Radiation Hardened PWM Controller

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UC1846-SP
SLUS871D – JANUARY 2009 – REVISED DECEMBER 2016
UC1846-SP Class-V, Radiation Hardened PWM Controller
1 Features
1 QML-V Qualified, SMD 5962-86806
• 5962P8680603VxA:
– 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
• Automatic Feed-Forward Compensation
• Programmable Pulse-by-Pulse Current Limiting
• Automatic Symmetry Correction in Push-Pull
Configuration
• Enhanced Load Response Characteristics
• Parallel-Operation Capability for Modular Power
Systems
• Differential Current-Sense Amplifier With Wide
Common-Mode Range
• Double-Pulse Suppression
• 500-mA (Peak) Totem-Pole Outputs
• ±1% Bandgap Reference
• Undervoltage Lockout (UVLO)
• Soft-Start Capability
• Shutdown Terminal
• 500-kHz Operation
2 Applications
• DC-DC Converters
• Satellite Buses and Payloads
• Space Launch Vehicles
• Undersea Cabling
• Available in Military Temperature Range (–55°C to
125°C)
• Supports Various Topologies:
– Flyback, Forward, Buck, Boost
– Push-Pull, Half-Bridge, Full Bridge With
External Interface Circuit
3 Description
The UC1846-SP control devices provide all of the
necessary features to implement fixed frequency,
current mode control schemes while maintaining a
minimum external parts count. The superior
performance of this technique can be measured in
improved line regulation, enhanced load response
characteristics, and a simpler, easier-to-design
control loop. Topological advantages include inherent
pulse-by-pulse current limiting capability, automatic
symmetry correction for push-pull converters, and the
ability to parallel power modules while maintaining
equal current sharing.
Protection circuitry includes built-in UVLO and
programmable current limit in addition to soft-start
capability. A shutdown function is also available
which can initiate either a complete shutdown with
automatic restart or latch the supply off.
Other features include fully latched operation, double-
pulse suppression, deadline adjust capability, a ±1%
trimmed bandgap reference, and low outputs in the
OFF state.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
CDIP (16)
6.92 mm × 19.56 mm
UC1846-SP
CFP (16)
LCCC (20)
KGD(2)
6.73 mm × 10.30 mm
8.89 mm × 8.89 mm
N/A
CDIP (16)
UC1846-SP RHA
CFP (16)
6.92 mm × 19.56 mm
6.73 mm × 10.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
(2) KGD = known good die
Block Diagram
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.




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UC1846-SP Datasheet Preview

UC1846-SP Datasheet

Radiation Hardened PWM Controller

No Preview Available !

UC1846-SP
SLUS871D – JANUARY 2009 – REVISED DECEMBER 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 6
6.1 Absolute Maximum Ratings ...................................... 6
6.2 ESD Ratings.............................................................. 6
6.3 Recommended Operating Conditions....................... 6
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 7
6.6 Typical Characteristics .............................................. 8
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes ....................................... 13
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ................................................ 15
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 22
11 Device and Documentation Support ................. 23
11.1 Receiving Notification of Documentation Updates 23
11.2 Community Resources.......................................... 23
11.3 Trademarks ........................................................... 23
11.4 Electrostatic Discharge Caution ............................ 23
11.5 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision C (October 2015) to Revision D
Page
• Changed title of data sheet from UC1846-SP Rad-Tolerant Class-V, Current-Mode PWM Controller : to UC1846-SP
Class-V, Radiation Hardened PWM Controller....................................................................................................................... 1
• Added new RHA features to Features section ....................................................................................................................... 1
• Added RHA package options to Device Information table ..................................................................................................... 1
• Changed shutdown threshold from 1.0 V : to 350 mV throughout document ........................................................................ 1
• Added Receiving Notification of Documentation Updates to Device and Documentation Support section ......................... 23
Changes from Revision B (October 2011) to Revision C
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section ................................................................................................. 1
• Added KGD package to Device Information........................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: UC1846-SP
Copyright © 2009–2016, Texas Instruments Incorporated


Part Number UC1846-SP
Description Radiation Hardened PWM Controller
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