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| 型号： | TPS40200HD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOIC-8 |
| 文件页数： | 19/45页 |
| 文件大小： | 917K |
| 代理商： | TPS40200HD |
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SW
RC
f
105
.
0
1
C
R
=
8
7
VDD
ISNS
R
ILIM
6
GDRV
V
IN
R
F1
R
F2
C
F
TPS40200
ILIM
R
1
.
0
ILIM =
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
www.ti.com
Switching Frequency
The TPS40200 has a built-in, 8-V, 200-mA, P-channel FET driver output that facilitates using P-channel
switching FETs. A clock frequency of 300 kHz was chosen as a switching frequency which represents a
compromise between a high frequency that allows the use of smaller capacitors and inductors, but one that is not
so high as to cause excessive transistor switching losses. As previously discussed, an optimum frequency can
be selected by picking a value where the dc and switching losses are equal.
The frequency is set by using the design formula given in the FET Selection Criteria section.
(17)
Where:
RRC = Timing resistor value (in ohms), or RRC = 68.1
CRC = Timing capacitor value (in F), or C5 = 470 pF
fSW = Desired switching frequency (in Hz) which, in this case, calculates to 297 kHz
At a worst case of 16 V, the timing resistor draws about 250 mA, which is well below the 750 mA maximum that
the circuit can pull down.
Programming the Overcurrent Threshold Level
The current limit in the TSP40200 is triggered by a comparator with a 100-mV offset, whose inputs are
connected across a current-sense resistor between VCC and the source of the high-side switching FET. When
current in this resistor develops more than 100 mV, the comparator trips and terminates the output gate drive.
In this application, the current-limit resistor is set by the peak output-stage current, which consists of the
maximum load current plus one-half the ripple current (in this case, 2.5 + 0.125 = 2.625 A). To accommodate
tolerances, a 25% margin is added, giving a 3.25-A peak current. Using the equation below then yields a value
for RILIM of 0.30 .
Current sensing in a switching environment requires attention to both circuit-board traces and noise pickup. In
Figure 35, a small RC filter has been added to the circuit to prevent switching noise from tripping the
current-sense comparator. The requirements of this filter are board dependent, but with the layout used in this
application, no spurious overcurrent was observed.
Figure 35. Overcurrent Trip Circuit for RF2 Open
26
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40200-HT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40200-HT | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200MDREP | 功能描述:DC/DC 开关控制器 Mil Enhanced Nonsync Vltg-Mode 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 |
| TPS40200MDREPG4 | 功能描述:电压模式 PWM 控制器 EP DC/DC CONTROLLER RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| TPS40200-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT-RANGE NONSYNCHRONOUS VOLTAGE-MODE CONTROLLER |
| TPS40200QDRQ1 | 功能描述:DC/DC 开关控制器 Wide-Inp-Rng Nonsync Vltg-Mode 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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