UC1843B-SP - Texas Instruments

UC1843B-SP PWM Controller

The UC1843B-SP control IC is a radiation hardened pin-for-pin compatible version of the UC1843A-SP. 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 .

Features

• QML class V (QMLV) qualified, SMD 5962-86704
• 5962R8670412VYC:
  – Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID)
• 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 2 Applications
• DC-DC con.