ZHCSJK9H June 2001 – October 2015 TPS54610
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Undervoltage Lockout (UVLO)
- 8.3.2 Slow Start/Enable (SS/ENA)
- 8.3.3 VBIAS Regulator (VBIAS)
- 8.3.4 Voltage Reference
- 8.3.5 Oscillator and PWM Ramp
- 8.3.6 Error Amplifier
- 8.3.7 PWM Control
- 8.3.8 Dead-Time Control and MOSFET Drivers
- 8.3.9 Overcurrent Protection
- 8.3.10 Thermal Shutdown
- 8.3.11 Power-Good (PWRGD)
- 8.4 Device Functional Modes
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
封裝選項
機械數據 (封裝 | 引腳)
- PWP|28
散熱焊盤機械數據 (封裝 | 引腳)
- PWP|28
訂購信息
8.3.5 Oscillator and PWM Ramp
The oscillator frequency can be set to internally fixed values of 350 kHz or 550 kHz using the SYNC pin as a static digital input. If a different frequency of operation is required for the application, the oscillator frequency can be externally adjusted from 280 to 700 kHz by connecting a resistor between the RT pin and AGND and floating the SYNC pin. The switching frequency is approximated by the following equation, where R is the resistance from RT to AGND:
External synchronization of the PWM ramp is possible over the frequency range of 330 kHz to 700 kHz by driving a synchronization signal into SYNC and connecting a resistor from RT to AGND. Choose a resistor between the RT and AGND which sets the free running frequency to 80% of the synchronization signal. Table 1 summarizes the frequency selection configurations:
Table 1. Switching Frequency/Synchronization Configuration
| SWITCHING FREQUENCY | SYNC PIN | RT PIN |
|---|---|---|
| 350 kHz, internally set | Float or AGND | Float |
| 550 kHz, internally set | ≥ 2.5 V | Float |
| Externally set 280 kHz to 700 kHz | Float | R = 180 kΩ to 68 kΩ |
| Externally synchronized frequency | Synchronization signal | R = RT value for 80% of external synchronization frequency |