Current-Mode PWM Controller - UC1846-SP

UC1846-SP (ACTIVE)

Current-Mode PWM Controller

 

Radiation Studies
View TID Radiation Report (typical performance): 40kRad(Si) [ELDERS]

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.

Features

  • 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

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Parametrics Compare all products in Offline and Isolated DC/DC Controller and Converter

 
Control Method
Vin (Min) (V)
Vin (Max) (V)
Topology
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
UC1846-SP
Current   
7   
40   
Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull   
50   
500   
7.7/6.95   
Error Amplifier
Soft Start
Synchronization Pin
Multi-topology   
Space   
-55 to 125   
CDIP
CFP
LCCC   
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89(LCCC)   

Other qualified versions of UC1846-SP

Version Part Number Definition
Catalog UC1846 TI's standard catalog product
Enhanced Product UC1846-EP Supports Defense, Aerospace and Medical Applications