MCZ5205SE

Application Note


Overview/Features

The MCZ5205SE adopts one chip solution to provide CrM PFC and LLC controller/driver in small package.
This robust combo-IC eliminates external components for protective function and its multi functional terminal configuration simplifies power supply designing by using minimal components.
Active standby function provides improved efficiency at light load condition. CrM PFC and Symmetric LLC combination provides excellent performance in low noise characteristics and also highly efficient power supply solution.

The MCZ5205SE is most suitable for:
　■ FPD PSU (LCD / PDP / Projection)
　■ OA equipment PSU (LBP …etc.)
　■ High power adapter
　■ High power industrial equipment
　■ High power LED lighting driver

1. PFC and LLC controllers are integrated in SOP22 package.
2. Active standby function improves efficiency at light load condition.
3. PFC adopts OVP multi-detective function to simplify the circuit.
4. Optimized PFC/LLC on-off timing.
5. Vcc up to 35V with 12.6 / 8.5V UVLO.

[ PFC ]
1. Critical conduction mode PFC controller.
2. Peak current limiting threshold of 0.5V.
3. No input line sensing is required.
4. Various protections are installed. (feedback pin open/short, dynamic OVP, Thermal shutdown)

[ LLC ]
1. Optimized Gate drive balance simplifies drive circuitry.
2. 600V floating gate drivers with individual UVLO.
3. Active standby operation eliminates a weak point of symmetric LLC that is unsatisfactory efficiency at light load condition.
4. Anti-capacitive protection
5. Various protections are installed. (Peak current limit / Timer delayed latching / Thermal shutdown)


Application Note Contents

1. General Description
    1.1 Features
    1.2 Internal block diagram
    1.3 Pin assignment
    1.4 Functions
    1.5 Application circuits
2. Functional description
    2.1 Outline
    2.2 Power supply block
    2.3 PFC block
    2.4 LLC block
    2.5 Others
    2.6 Remarks
3. Peripheral components setting
    3.1 PFC ZCS turn on timing (ZC)
    3.2 PFC Phase compensation (COMP)
    3.3 PFC Output voltage / OVP threshold (FBP)
    3.4 PFC OCP setting (CSP)
    3.5 LLC Brown out protection (Vsen)
    3.6 LLC Oscillator / Feedback (FBL)
    3.7 LLC Soft start / protection delay timer (SST)
    3.8 LLC Current limiting / capacitive mode protection (CSL)
    3.9 PFC Output voltage and LLC Brown out protection
         (In case of common sensing line for FBP and Vsen)
4. Circuit diagram
    4.1 Typical application circuit (LLC dual output)
5. Dimension
    5.1 SOP22 (MCZ5205SE)

Example Circuits


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