UC1843A-SP Current Mode PWM Controller | TI.com

UC1843A-SP (ACTIVE)

Current Mode PWM Controller

 

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.

Features

  • 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

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Parametrics

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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UC1843A-SP Order now Boost
Flyback
Forward    
Current         500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
CFP | 10
LCCC | 20    
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1825A-SP Samples not available Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current         1000     9.2/8.4     50     2     Error Amplifier
Leading Edge Blanking
Multi-topology
Soft Start
Synchronization Pin    
Space     -55 to 125     CDIP | 16
CFP | 16
LCCC | 20    
See datasheet (CDIP)
See datasheet (CFP)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1825B-SP Samples not available   Peak Current Mode
Voltage    
10     30       10/9.2     80       Adjustable Switching Frequency
Enable/Shutdown
Error Amplifier
Integrated Gate Drivers
Programmable Soft Start
Soft Start    
Space     -55 to 125     CFP | 16     See datasheet (CFP)    
UC1843-SP Samples not available Boost
Flyback
Forward    
Current         500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
LCCC | 20    
See datasheet (CDIP)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1843B-SP Samples not available   Peak Current Mode
Voltage    
12     25       8.4/7.7     100         Space     -55 to 125     CFP | 10     See datasheet (CFP)