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| 型号： | TPS40195PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 10/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195PWG4 |
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Pre-Bias Startup
Drivers
Power Good
Thermal Shutdown
SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008 ........................................................................................................................................ www.ti.com
The TPS40195 contains a unique circuit to prevent current from being pulled from the output during startup in the
condition the output is pre-biased. When the soft-start commands a voltage higher than the pre-bias level
(internal soft-start becomes greater than feedback voltage [VFB]), the controller slowly activates synchronous
rectification by starting the first LDRV pulses with a narrow on-time. It then increments that on-time on a
cycle-by-cycle basis until it coincides with the time dictated by (1-D), where D is the duty cycle of the converter.
This scheme prevents the initial sinking of the pre-bias output, and ensures that the out voltage (VOUT) starts and
ramps up smoothly into regulation and the control loop is given time to transition from pre-biased startup to
normal mode operation with minimal disturbance to the output voltage. The amount of time from the start of
switching until the low-side MOSFET is turned on for the full 1-D interval is defined by 32 clock cycles.
The drivers for the external HDRV and LDRV MOSFETs are capable of driving a gate-to-source voltage of 5 V.
The LDRV driver switches between VDD and GND, while HDRV driver is referenced to SW and switches
between BOOT and SW. The drivers have non-overlapping timing that is governed by an adaptive delay circuit to
minimize body diode conduction in the synchronous rectifier. The drivers are capable of driving MOSFETS that
are appropriate for a 15-A converter if power dissipation requirements are met. See Package Dissipation Ratings
Table.
The TPS40195 provides an indication that output power is good for the converter. This is an open drain signal
and pulls low when any condition exists that would indicate that the output of the supply might be out of
regulation. These conditions include:
V
FB > ±10% from nominal
soft-start is active
a undervoltage condition exists for the device
a short circuit condition has been detected
die temperature is over (150°C)
NOTE:
When there is no power to the device, PGOOD is not able to pull close to GND if an
auxiliary supply is used for the power good indication. In this case, a built in resistor
connected from drain to gate on the PGOOD pull down device makes the PGOOD pin
look approximately like a diode to GND.
Thermal shutdown If the junction temperature of the device reaches the thermal shutdown limit of 150°C, the
PWM and the oscillator is turned off and HDRV and LDRV are driven low, turning off both FETs. When the
junction cools to the required level (130°C nominal), the PWM initiates soft start as during a normal power up
cycle.
18
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40195
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40195PWR | 功能描述:DC/DC 开关控制器 4.5V to 20V Buck RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40195PWRG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40195RGYR | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40195RGYRG4 | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40195RGYT | 功能描述:DC/DC 开关控制器 4.5V-20V Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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