UC1843-SP QML Class V Current Mode PWM Controller | TI.com

UC1843-SP (ACTIVE) QML Class V Current Mode PWM Controller

QML Class V Current Mode PWM Controller - UC1843-SP
Datasheet
 

Description

The UC1843 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count. Internally implemented circuits include under-voltage lockout featuring start up current less than 1 mA, a precision reference trimmed for accuracy at the error amp input, logic to insure latched operation, a PWM comparator which also provides current limit control, and a totem pole output stage designed to source or sink high peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state. The under-voltage lockout threshold is 8.4 V and maximum duty cycle range is around 100%.

Features

  • QML-V Qualified, SMD 5962-86704
  • Rad-Tolerant: 50 kRad (Si) TID (ELDRS Free)(1)
  • Controlled Baseline
  • Optimized For Off-line and DC-to-DC Converters
  • Low Start-Up Current (<1 mA)
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Under-Voltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High Current Totem Pole Output
  • Internally Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amp

(1) Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/sec. Radiation Lot Acceptance Testing is available - contact factory for details.

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)
UC1843-SP Order now Boost
Flyback
Forward    
Current     8.5     30     500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
LCCC | 20    
8CDIP: 64 mm2: 6.67 x 9.6 (CDIP | 8)
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     10     30     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    
16CDIP: 135 mm2: 6.92 x 19.56 (CDIP | 16)
16CFP: 72 mm2: 7.1 x 10.16 (CFP | 16)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1825B-SP Samples not available Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
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     16CFP: 72 mm2: 7.1 x 10.16 (CFP | 16)    
UC1843A-SP Samples not available Boost
Flyback
Forward    
Current     12     25     500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
CFP | 10
LCCC | 20    
8CDIP: 64 mm2: 6.67 x 9.6 (CDIP | 8)
10CFP: 45 mm2: 6.48 x 7.02 (CFP | 10)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1843B-SP Samples not available Boost
Buck
Flyback
Forward    
Peak Current Mode
Voltage    
12     25     500     8.4/7.7     100       Error Amplifier
Multi-topology    
Space     -55 to 125     CFP | 10     10CFP: 45 mm2: 6.48 x 7.02 (CFP | 10)