- 您现在的位置：买卖IC网 > PDF目录69512 > TPS54620RGYR (TEXAS INSTRUMENTS INC) 11 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 PDF资料下载
参数资料
| 型号： | TPS54620RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 11 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 |
| 封装： | 3.50 X 3.50 MM, GREEN, PLASTIC, MO-241BA, VQFN-14 |
| 文件页数： | 2/44页 |
| 文件大小： | 1827K |
| 代理商： | TPS54620RGYR |
第1页当前第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页
SLVS949C
– MAY 2009 – REVISED MAY 2011
TYPICAL CHARACTERISTICS (continued)
The device reduces the external component count by integrating the boot recharge circuit. The bias voltage for
the integrated high-side MOSFET is supplied by a capacitor between the BOOT and PH pins. The boot capacitor
voltage is monitored by a BOOT to PH UVLO (BOOT-PH UVLO) circuit allowing PH pin to be pulled low to
recharge the boot capacitor. The device can operate at 100% duty cycle as long as the boot capacitor voltage is
higher than the preset BOOT-PH UVLO threshold which is typically 2.1V. The output voltage can be stepped
down to as low as the 0.8V voltage reference (Vref).
The device has a power good comparator (PWRGD) with hysteresis which monitors the output voltage through
the VSENSE pin. The PWRGD pin is an open drain MOSFET which is pulled low when the VSENSE pin voltage
is less than 91% or greater than 109% of the reference voltage Vref and asserts high when the VSENSE pin
voltage is 94% to 106% of the Vref.
The SS/TR (slow start/tracking) pin is used to minimize inrush currents or provide power supply sequencing
during power up. A small value capacitor or resistor divider should be coupled to the pin for slow start or critical
power supply sequencing requirements.
The device is protected from output overvoltage, overload and thermal fault conditions. The device minimizes
excessive output overvoltage transients by taking advantage of the overvoltage circuit power good comparator.
When the overvoltage comparator is activated, the high-side MOSFET is turned off and prevented from turning
on until the VSENSE pin voltage is lower than 106% of the Vref. The device implements both high-side MOSFET
overload protection and bidirectional low-side MOSFET overload protections which help control the inductor
current and avoid current runaway. The device also shuts down if the junction temperature is higher than thermal
shutdown trip point. The device is restarted under control of the slow start circuit automatically when the junction
temperature drops 10
°C typically below the thermal shutdown trip point.
DETAILED DESCRIPTION
Fixed Frequency PWM Control
The device uses a adjustable fixed frequency, peak current mode control. The output voltage is compared
through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives
the COMP pin. An internal oscillator initiates the turn on of the high-side power switch. The error amplifier output
is converted into a current reference which compares to the high-side power switch current. When the power
switch current reaches current reference generated by the COMP voltage level the high-side power switch is
turned off and the low-side power switch is turned on.
Continuous Current Mode Operation (CCM)
As a synchronous buck converter, the device normally works in CCM (Continuous Conduction Mode) under all
load conditions.
VIN and Power VIN Pins (VIN and PVIN)
The device allows for a variety of applications by using the VIN and PVIN pins together or separately. The VIN
pin voltage supplies the internal control circuits of the device. The PVIN pin voltage provides the input voltage to
the power converter system.
If tied together, the input voltage for VIN and PVIN can range from 4.5V to 17V. If using the VIN separately from
PVIN, the VIN pin must be between 4.5V and 17V, and the PVIN pin can range from as low as 1.6V to 17V. A
voltage divider connected to the EN pin can adjust the either input voltage UVLO appropriately. Adjusting the
input voltage UVLO on the PVIN pin helps to provide consistent power up behavior.
Voltage Reference
The voltage reference system produces a precise
±1% voltage reference over temperature by scaling the output
of a temperature stable bandgap circuit.
10
Copyright
2009–2011, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54673PWPR | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54673PWP | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54673PWPG4 | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54673PWPRG4 | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54900PWG4 | SPECIALTY ANALOG CIRCUIT, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54620RGYT | 功能描述:直流/直流开关调节器 4.5-17Vin 6A Synch St Down SWIFT Cnvtr 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 |
| TPS54620RGYT-P | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS54620RHLR | 功能描述:直流/直流开关转换器 4.5-17Vin,6A Syn Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54620RHLT | 功能描述:直流/直流开关转换器 4.5-17Vin,6A Syn Step Down Cnvrtr RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54622 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4.5V to 17V Input, 6A Synchronous Step Down SWIFT? Converter With Hiccup |
发布紧急采购，3分钟左右您将得到回复。