ZHCSMU0D July 2009 – December 2020 TPS23753A
PRODUCTION DATA
- 1 特性
- 2 應(yīng)用
- 3 說明
- 4 Revision History
- 5 Product Information
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3 Feature Description
- 8.4
Device Functional Modes
- 8.4.1 Threshold Voltages
- 8.4.2 PoE Start-Up Sequence
- 8.4.3 Detection
- 8.4.4 Hardware Classification
- 8.4.5 Maintain Power Signature (MPS)
- 8.4.6 TPS23753A Operation
- 8.4.7 Special Switching MOSFET Considerations
- 8.4.8 Thermal Considerations
- 8.4.9 FRS and Synchronization
- 8.4.10 Blanking – RBLNK
- 8.4.11 Current Slope Compensation
- 8.4.12 Adapter ORing
- 8.4.13 Protection
- 8.4.14 Frequency Dithering for Conducted Emissions Control
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
封裝選項
機械數(shù)據(jù) (封裝 | 引腳)
- PW|14
散熱焊盤機械數(shù)據(jù) (封裝 | 引腳)
訂購信息
6 Pin Configuration and Functions
Figure 6-1 PW Package14-Pin TSSOPTop ViewTable 6-1 Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NO. | NAME | ||
| 1 | CTL | I | The control loop input to the PWM (pulse width modulator). Use VB as a pullup for CTL. |
| 2 | VB | O | 5-V bias rail for DC-DC control circuits. Apply a 0.1-μF ceramic capacitor to RTN. VB may be used to bias an external optocoupler for feedback. |
| 3 | CS | I | DC-DC converter switching MOSFET current-sense input. Connect CS to the high side of RCS. |
| 4 | VC | I/O | DC-DC converter bias voltage. The internal start-up current source and converter bias winding output power this pin. Connect a 0.22-μF minimum ceramic capacitor to RTN, and a larger capacitor to facilitate start-up. |
| 5 | GATE | O | Gate drive output for the DC-DC converter switching MOSFET. |
| 6 | RTN | — | RTN is the negative rail input to the DC-DC converter and output of the PoE hotswap. |
| 7 | VSS | — | Negative power rail derived from the PoE source. |
| 8 | VDD1 | — | Source of DC-DC converter start-up current. Connect to VDD for most applications. |
| 9 | VDD | — | Positive input power rail for PoE interface circuit. Derived from the PoE source. |
| 10 | DEN | I/O | Connect a 24.9-k? resistor from DEN to VDD to provide the PoE detection signature. Pulling this pin to VSS during powered operation causes the internal hotswap MOSFET to turn off. |
| 11 | CLS | O | Connect a resistor from CLS to VSS to program the classification current. |
| 12 | APD | I | Pull APD above 1.5 V to disable the internal PD hotswap switch, forcing power to come from an external adapter. Connect to the adapter through a resistor divider. |
| 13 | BLNK | I/O | Connect to RTN to use the internally set blanking period or connect through a resistor to RTN to program the blanking period. |
| 14 | FRS | I/O | Connect a resistor from FRS to RTN to program the converter switching frequency. |