- 您现在的位置：买卖IC网 > PDF目录69510 > TPS53126PW (TEXAS INSTRUMENTS INC) 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 PDF资料下载
参数资料
| 型号： | TPS53126PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.17 A DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | PLASTIC, TSSOP-24 |
| 文件页数： | 2/30页 |
| 文件大小： | 899K |
| 代理商： | TPS53126PW |
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
SWITCHING FREQUENCY SELECTION
OUTPUT DISCHARGE CONTROL
OVERCURRENT LIMIT
O
IN
trip
OCL
DS(on)
IN
V
(V
Vo)
V
= I
R
2
L1
sw
V
-
-
(1)
trip
V
(mV)
R
(k ) =
I
( A)
W
m
(2)
OVER/UNDER VOLTAGE PROTECTION
UVLO PROTECTION
THERMAL SHUTDOWN
SLUS909 – MAY 2009........................................................................................................................................................................................................ www.ti.com
The TPS53126 allows the user to select from 2 different switching frequencies by connecting the TEST2 pin to
either GND or V5FILT. Connect TEST2 to GND for a switching frequency (fsw) of 350KHz. Connect TEST2 to
V5FILT for a switching frequency of 700KHz.
The TPS53126 discharges the outputs when ENx is low, or when the controller is turned off by the protection
functions (OVP, UVP, UVLO, and thermal shutdown). The device discharges an output using an internal 40-
MOSFET which is connected to VOx and PGNDx. The external low-side MOSFET is not turned on during the
output discharge operation to avoid the possibility of causing negative voltage at the output. This discharge
ensures that, on start, the regulated voltage always initializes from zero volts.
The TPS53126 has a cycle-by-cycle over current limit feature. The over current limits the inductor valley current
by monitoring the voltage drop across the low-side MOSFET RDS(on) during the low-side driver on-time. If the
inductor current is larger than the over current limit (OCL), the TPS53126 delays the start of the next switching
cycle until the sensed inductor current falls below the OCL current. MOSFET RDS(on) current sensing is used to
provide an accuracy and cost effective solution without external devices. To program the OCL, the TRIPx pin
should be connected to GND through a trip voltage setting resistor, according to the following equations.
The trip voltage should be between 30mV to 300mV over all operational temperature, including the 4000ppm/°C
temperature slope compensation for the temperature dependency of the RDS(on). If the load current exceeds the
over-current limit, the voltage will begin to drop. If the over-current conditions continues the output voltage will fall
below the under voltage protection threshold and the TPS53126 will shut down.
The TPS53126 monitors the output voltage via the feedback voltage to detect over and under voltage. When the
feedback voltage becomes higher than 115% of the reference voltage, the TPS53126 turns off the high-side
MOSFET driver, turns on the low-side MOSFET driver and latches off.
When the feedback voltage becomes lower than 70% of the reference voltage, the TPS53126 begins an internal
UVP delay counter. After 30
s, the TPS53126 turns off both top and bottom MOSFET drivers and latches off.
The UVP function is enabled approximately 2.0ms after power-on to prevent detecting UVP during soft-start.
Both OVP and UVP latch conditions are reset when V5FILT triggers UVLO or the ENx pin goes low.
The TPS53126 has under voltage lock out protection (UVLO) that monitors the voltage of V5FILT pin. When the
V5FILT voltage is lower than UVLO threshold voltage, the device is shut off. During shut-off, VREG5 and all
output drivers are OFF and output discharge is ON. The UVLO is non-latch protection.
The TPS53126 includes an over temperature protection shut-down feature. If the TPS53126 die temperature
exceeds the OTP threshold (typically 150°C), both the high-side and low-side drivers are shut off, the output
voltage discharge function is enabled and then the device is shut off until the die temperature drops. Thermal
shutdown is a non-latch protection.
10
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53126
相关PDF资料 |
PDF描述 |
|---|---|
| TPS53129PWR | DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO24 |
| TPS53129RGET | DUAL SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PQCC24 |
| TPS53315RGFR | SWITCHING REGULATOR, 1070 kHz SWITCHING FREQ-MAX, PQCC40 |
| TPS53321RGTR | SWITCHING REGULATOR, 1210 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS53321RGTT | SWITCHING REGULATOR, 1210 kHz SWITCHING FREQ-MAX, PQCC16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS53126PWR | 功能描述:DC/DC 开关控制器 Dual Sync. Step Down Controller 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 |
| TPS53126RGER | 功能描述:DC/DC 开关控制器 Dual Sync. Step Down Controller 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 |
| TPS53126RGET | 功能描述:DC/DC 开关控制器 Dual Sync. Step Down Controller 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 |
| TPS53127 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS |
| TPS53127_1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL SYNCHRONOUS STEP-DOWN CONTROLLER FOR LOW VOLTAGE POWER RAILS |
发布紧急采购，3分钟左右您将得到回复。