ZHCS310G JANUARY   2009  – September 2015 UCC28610

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Fault Recovery
      2. 7.3.2 Maximum On-Time and Brown Out
      3. 7.3.3 External Shutdown Using the MOT Pin
      4. 7.3.4 Overvoltage Detection
      5. 7.3.5 Solving for High Frequency Ringing
        1. 7.3.5.1 Identification of High Frequency Ringing
        2. 7.3.5.2 Avoid HF Ringing
        3. 7.3.5.3 Ferrite Chip or Bead Solution
        4. 7.3.5.4 DRV Capacitor Solution
        5. 7.3.5.5 Gate Turn-Off Resistor Solution
      6. 7.3.6 Thermal Shutdown
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Transformer Selection
      2. 8.1.2 Cascode Bias and Start-Up
      3. 8.1.3 Feedback Function
      4. 8.1.4 Modulation Modes
      5. 8.1.5 Primary Current Sense
      6. 8.1.6 Zero Crossing Detection
      7. 8.1.7 Green Mode Operation
      8. 8.1.8 Maximum Converter Power Limitation
      9. 8.1.9 Minimum Converter Power Limitation
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Bulk Capacitance and Minimum Bulk Voltage
        2. 8.2.2.2 Transformer Selection
        3. 8.2.2.3 Feedback Function
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 社区资源
    2. 11.2 商标
    3. 11.3 静电放电警告
    4. 11.4 Glossary
  12. 12机械、封装和可订购信息

5 Pin Configuration and Functions

D Package
8-Pin SOIC
Top View
UCC28610 pinout_lus888.gif
P Package
8-Pin PDIP
Top View
UCC28610 pinout_p_pack_lus888.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
CL 3 I (Current Limit) This pin programs the peak primary inductor current that is reached each switching cycle. Program with a resistor between CL and GND.
DRV 6 O (DRiVe) This pin drives the source of an external high voltage power MOSFET. The DRV pin carries the full primary current of the converter. Connect a Schottky diode between DRV and VDD to provide initial bias at start up.
FB 1 I (FeedBack) The FB current, IFB, commands the operating mode of the UCC28610. The FB voltage is always 0.7 V. This pin only detects current.
GND 7 — (GrouND) This pin is the current return terminal for both the analog and power signals in the UCC28610. This terminal carries the full primary current of the converter. Separate the return path of the bulk capacitor from the return path of FB, ZCD, MOT, and CL.
MOT 4 I (Maximum On Time) This pin has three functions:
  1. MOT programs the allowed maximum on-time, tMOT, of the internal driver.
  2. MOT programs the converter’s reaction to overload and power input under-voltage conditions with either a shutdown/retry response or a latch-off response.
  3. MOT can be used to externally shut down the power supply by pulling MOT to GND. When the pin is released, the converter will start after a restart delay, tRETRY.

Functions 1 and 2 are programmed with a resistor between MOT and GND.
VDD 8 — This is the bias supply pin for the UCC28610. It can be derived from an external source or an auxiliary winding. This pin must be decoupled with a 0.1-μF ceramic capacitor placed between VDD and GND, as close to the device as possible.
VGG 5 — This pin provides a DC voltage for the gate of the external high voltage MOSFET. This pin must be decoupled with a 0.1-μF ceramic capacitor placed between VGG and GND, as close to the device as possible. This pin also initiates start-up bias through a large value resistor that is connected to the input bulk voltage.
ZCD 2 I (Zero Current Detection) This pin has two functions:
  1. ZCD senses the transformer reset based on a valid zero current detection signal.
  2. ZCD programs the output Over Voltage Protection (OVP) feature using a resistive divider on the primary side bias winding of the Flyback transformer.
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