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UC1844A-SP

ACTIVE

Space-grade QMLV, enhanced 30-V input, 1-A single-output 500-kHz PWM controller, 50% duty cycle

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Data sheet

UC1844A-SP

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 30 Operating temperature range (°C) -55 to 125 Control mode Current Topology Boost, Flyback, Forward Rating Space Features Error amplifier, Multi-topology Duty cycle (max) (%) 50
Vin (max) (V) 30 Operating temperature range (°C) -55 to 125 Control mode Current Topology Boost, Flyback, Forward Rating Space Features Error amplifier, Multi-topology Duty cycle (max) (%) 50
CDIP (JG) 8 64.032 mm² 9.6 x 6.67
  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • Rad-Tolerant: 30-krad(Si) TID (1) (2)
  • 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

(1)The LDR improved die is only available in the UC1843A-SP (orderable as 5962-8670409VPA). Contact factory to request an LDR-improved version of the UC1842A-SP or UC1844A-SP.

(2)Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad(Si)/s. Radiation lot acceptance testing is available - contact factory for details.
  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • Rad-Tolerant: 30-krad(Si) TID (1) (2)
  • 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

(1)The LDR improved die is only available in the UC1843A-SP (orderable as 5962-8670409VPA). Contact factory to request an LDR-improved version of the UC1842A-SP or UC1844A-SP.

(2)Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad(Si)/s. Radiation lot acceptance testing is available - contact factory for details.

The UC184xA-SP family of control ICs is a pin-for-pin compatible improved 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.

The UC184xA-SP family of control ICs is a pin-for-pin compatible improved 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.
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* Data sheet UC184xA-SP QML class V, current-mode PWM controller datasheet (Rev. E) PDF | HTML 22 Feb 2019

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