Description
The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control currentmode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.
Features
• Optimized for Off-Line and DC-DC Converters
• Low Start-Up Current (< 0.5 mA)
• Trimmed Oscillator Discharge Current
• Automatic Feedforward Compensation
• Pulse-by-Pulse Current Limiting
• Enhanced Load Response Characteristics
• Undervoltage Lockout With Hysteresis
• Double Pulse Suppression
• High-Current Totem Pole Output
• Internally-Trimmed Bandgap Reference
• Up to 500-kHz Operation
Applications
• Switch Mode Power Supplies (SMPS)
• DC-DC Converters
• Power Modules
• Industrial PSU
• Battery Operated PSU
Feature
- Optimized for Off-Line and DC-DC Converters
- Low Start-UpCurrent (< 0.5 mA)
- Trimmed Oscillator DischargeCurrent
- Automatic Feedforward Compensation
- Pulse-by-PulseCurrent Limiting
- Enhanced Load ResponseCharacteristics
- Undervoltage Lockout With Hysteresis
- DoublePulse Suppression
- High-Current Totem PoleOutput
- Internally-Trimmed Bandgap Reference
- Up to 500-kHzOperation
- Create a Custom Design Using the UCx84xA With theWEBENCH? Power Designer
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DescriptionThe UCx84xA family of control devices is a pin-for-pin compatible improved version of theUCx84x family. Providing the necessary features to control current-mode or switched-mode powersupplies, this family of devices has many improved features: startup current is less than 0.5 mA,oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10mA at less than 1.2 V for VCC over 5V.
(Picture: Pinout)
