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参数资料
| 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： | 8/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195PWG4 |
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f
DAC
SS
SW
N
t
0.591
=
(4)
Selecting the Short Circuit Threshold
7
ILIM
I
ILIM
9 mA
BP
R
+
R
ILIM
15
SW
+
t
BLNK
+
550 mV
VDD
LDRV On
t
BLNK
HDRV On
S
Q
R
CLK
UP/DN
3-Bit Counter
Q0
Q1
Q2
Fault
VDD
HDRV
LDRV
UDG-07001
SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008 ........................................................................................................................................ www.ti.com
The ramp output from the soft start DAC is 1 V in amplitude. Since the soft start is closed loop and reference
voltage of the device is actually 591 mV, the actual ramp time is less than the time it takes for the SS ramp to
finish and reach 1 V. The actual soft-start time is the amount of time that it takes for the internal soft-start ramp to
reach the 591-mV reference level. The soft-start time can be found using Equation 4.
where
N
DAC is the number of 1-V DAC ramp cycles from Table 2
f
SW is the switching frequency in Hz
An over current is detected by sensing a voltage drop across the low-side FET when it is on, and across the
high-side FET when it is on. If the voltage drop across either FET exceeds the short circuit threshold in any given
switching cycle, a counter increments one count. If the voltage across the high-side FET was higher that the
short circuit threshold, that FET is turned off early. If the voltage drop across either FET does not exceed the
short circuit threshold during a cycle, the counter is decremented for that cycle. If the counter fills up (a count of
7) a fault condition is declared and the drivers turn off both MOSFETs. After a timeout of approximately 40 ms,
the controller attempts to restart. If a short circuit remains present at the output, the current quickly ramps up to
the short circuit threshold and another fault condition is declared and the process of waiting for the 40 ms and
attempting to restart repeats.
The current limit threshold for the low-side FET is programmable by the user. To set the threshold a resistor is
connected from the ILIM pin to GND. A current source inside the IC connected to the ILIM pin and this resistor
set a voltage that is the threshold used for the overcurrent detection threshold. The low side threshold will
increase as the low side on time decreases due to blanking time and comparator response time. See Figure 5 for
changes in the threshold as the low-side FET conduction time decreases. Refer to Figure 21 for details on the
functional equivalent schematic.
Figure 21. Overcurrent
16
Copyright 2007–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS40195
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相关代理商/技术参数 |
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|---|---|
| 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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