UC1846-SP_15 Datasheet, PDF (1/29 Pages) Texas Instruments – Current-Mode PWM Controller

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UC1846-SP
SLUS871C – JANUARY 2009 – REVISED OCTOBER 2015
UC1846-SP Rad-Tolerant Class-V, Current-Mode PWM Controller
1 Features
•1 QML-V Qualified, SMD 5962-8680603VxA ⁽¹⁾
– Rad-Tolerant: 40 kRad (Si) TID
• 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)
6.73 mm × 10.30 mm
8.89 mm × 8.89 mm
KGD
N/A
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
(1) Radiation tolerance is a typical value based upon initial device
qualification with dose rate = 10 mRad/s. Radiation Lot
Acceptance Testing is available - contact factory for details.
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.