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参数资料
| 型号： | TPS54615MPWPREP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | PLASTIC, HTSSOP-28 |
| 文件页数： | 6/21页 |
| 文件大小： | 650K |
| 代理商： | TPS54615MPWPREP |
www.ti.com
Dead-Time Control and MOSFET Drivers
Overcurrent Protection
Thermal Shutdown
Power Good (PWRGD)
TPS54611-EP, TPS54612-EP
TPS54613-EP, TPS54614-EP
TPS54615-EP, TPS54616-EP
SGLS293A – FEBRUARY 2005 – REVISED AUGUST 2005
Adaptive dead-time control prevents shoot-through current from flowing in both N-channel power MOSFETs
during the switching transitions by actively controlling the turnon times of the MOSFET drivers. The high-side
driver does not turn on until the voltage at the gate of the low-side FET is below 2 V. The high-side and low-side
drivers are designed with 300 mA source and sink capability to quickly drive the power MOSFETs gates. The
low-side driver is supplied from VIN, while the high-side drive is supplied from the BOOT pin. A bootstrap circuit
uses an external BOOT capacitor and internal 2.5-
bootstrap switch connected between the VIN and BOOT
pins. The integrated bootstrap switch improves drive efficiency and reduces external component count.
Cycle-by-cycle current limiting is achieved by sensing the current flow through the high-side MOSFET and a
differential amplifier with preset overcurrent threshold. The high-side MOSFET is turned off within 200 ns of
reaching the current limit threshold. A 100-ns leading edge blanking circuit prevents false tripping of current limit.
Current limit detection occurs only when current flows from VIN to PH when sourcing current to the output filter.
Load protection during current sink operation is provided by thermal shutdown.
The device uses the thermal shutdown to turn off the power MOSFETs and disable the controller if the junction
temperature exceeds 150
°C. The device is released from shutdown when the junction temperature decreases to
10
°C below the thermal shutdown trip point, and starts up under control of the slow-start circuit. Thermal
shutdown provides protection when an overload condition is sustained for several milliseconds. With a persistent
fault condition, the device cycles continuously: starting up by control of the slow-start circuit, heating up due to
the fault, and then shutting down upon reaching the thermal shutdown trip point.
The power good circuit monitors for under voltage conditions on VSENSE. If the voltage on VSENSE falls 10%
below the reference voltage, the open-drain PWRGD output is pulled low. PWRGD is also pulled low if VIN is
less than the UVLO threshold, or SS/ENA is low, or thermal shutdown is asserted. When VIN = UVLO threshold,
SS/ENA = enable threshold, and VSENSE > 90% of Vref, the open drain output of the PWRGD pin is high. A
hysteresis voltage equal to 3% of Vref and a 35-s falling edge deglitch circuit prevent tripping of the power good
comparator due to high-frequency noise.
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相关代理商/技术参数 |
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| TPS54615PWP | 功能描述:直流/直流开关调节器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54615PWPG4 | 功能描述:直流/直流开关调节器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54615PWPR | 功能描述:直流/直流开关调节器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54615PWPRG4 | 功能描述:直流/直流开关调节器 Lo-In Vltg 6A Sync Sync Buck Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS54615-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-V TO 6-V INPUT, 6-A OUTPUT SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs(SWIFT) |
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