UC3843 - SMD / SMT SMD-8 Current Mode PWM Controller

UC3843 SMD-8 Current Mode PWM Controller IC

The UC3843 is a current-mode PWM controller IC. It is packaged in an SMD-8 (SOIC-8) form factor. This controller supports off-line and DC-DC converter applications. It facilitates high-density PCB assembly. The UC3843 provides precise regulation for power output. Current-mode control contributes to line and load regulation. It integrates cycle-by-cycle current limiting. The IC is suitable for switch-mode power supplies, LED drivers, and battery chargers.

Specifications:

• Function: Current Mode PWM Controller
• Package Type: SMD-8 / SOIC-8 (Surface-Mount)
• Operating Voltage Range: 8.5V to 30V
• Output Voltage Swing: 0V to ~VCCO
• Oscillator Frequency: Up to 500 kHz
• Start-Up Current: < 1 mA
• Operating Supply Current: ~11 mA
• UVLO Threshold (Turn-on): ~8.5V
• UVLO Threshold (Turn-off): ~7.6V
• Reference Voltage: 5V ±1%
• Output Drive Current: ±1A (typical)
• RoHS Compliant: Yes

Key features and benefits:

• Current-mode control for line and load regulation.
• Integrated cycle-by-cycle current limiting.
• Oscillator frequencies up to 500 kHz.
• Undervoltage Lockout (UVLO) included.
• Fast transient response.
• SMD-8 (SOIC-8) surface-mount package.

Applications:

• Off-line Switch-Mode Power Supplies (SMPS)
• DC-DC Converters
• LED Drivers
• Battery Chargers
• Industrial Control Power Modules

Frequently Asked Questions:

Q: What is the package type of the UC3843?
A: The UC3843 is supplied in an SMD-8 (SOIC-8) surface-mount package.

Q: What is the operating voltage range for this controller?
A: The operating voltage range is 8.5V to 30V.

Q: Does the UC3843 include overcurrent protection?
A: Yes, it features integrated cycle-by-cycle current limiting.

Q: What is the internal reference voltage?
A: The internal reference voltage is 5V ±1%.

Q: Can this UC3843 replace a UC3842?
A: The UC3843 has a lower UVLO turn-on threshold (~8.5V) compared to the UC3842 (~16V), which may require circuit modification.

Package Includes:

*Image shown is a representation only.

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