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參數(shù)資料
| 型號： | TPS55383PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7 A DUAL SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-26 |
| 文件頁數(shù)： | 16/45頁 |
| 文件大?。?/td> | 1318K |
| 代理商： | TPS55383PWPRG4 |
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Output Overload Protection
www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008
SW Node Snubber
Voltage ringing at the SW node is caused by fast switching edges and parasitic inductance and capacitance. If
the ringing results in excessive voltage on the SW node, or erratic operation of the converter, an R-C snubber
may be used to dampen the ringing and ensure proper operation over the full load range.
DESIGN HINT
A series-connected R-C snubber (C = between 330 pF and 1 nF, R = 10
)
connected from SW to GND reduces the ringing on the SW node.
Bootstrap Resistor
A small resistor in series with the bootstrap capacitor reduces the turn-on time of the internal MOSFET, thereby
reducing the rising edge ringing of the SW node.
DESIGN HINT
A resistor with a value between 1
and 3 may be placed in series with the
bootstrap capacitor to reduce ringing on the SW node.
DESIGN HINT
Placeholders for these components should be placed on the initial prototype PCBs in
case they are needed.
In the event of an overcurrent during soft-start on either output (such as starting into an output short),
pulse-by-pulse current limiting and PWM frequency division are in effect for that output until the internal soft-start
timer ends. At the end of the soft-start time, a UV fault is declared. During this fault, both PWM outputs are
disabled and the small pulldown MOSFETs (from SWx to GND) are turned ON. This process ensures that both
outputs discharge to GND in the event that overcurrent is on one output while the other is not loaded. The
converter then enters a hiccup mode timeout before attempting to restart. Frequency Division describes a
condition when an overcurrent pulse is detected and six clock cycles are skipped before a next PWM pulse is
initiated, effectively dividing the operating frequency by six and preventing excessive current build up in the
inductor.
In the event of an overcurrent condition on either output after the output reaches regulation, pulse-by-pulse
current limit is in effect for that output. In addition, an output undervoltage (UV) comparator monitors the FBx
voltage (that follows the output voltage) to declare a fault if the output drops below 85% of regulation. During this
fault condition, both PWM outputs are disabled and the small pulldown MOSFETs (from SWx to GND) are turned
ON. This design ensures that both outputs discharge to GND, in the event that overcurrent is on one output while
the other is not loaded. The converter then enters a hiccup mode timeout before attempting to restart.
The overcurrent threshold for Output 1 is set nominally at 4.5 A. The overcurrent level of Output 2 is determined
by the state of the ILIM2 pin. The ILIM setting of Output 2 is not latched in place and may be changed during
operation of the converter.
Table 2. Current Limit Threshold Adjustment for
Output 2
ILIM2 Connection
OCP Threshold for Output 2
BP
4.5 A nominal setting
(floating)
3.0 A nominal setting
GND
1.5 A nominal setting
Copyright 2008, Texas Instruments Incorporated
23
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| TPS55386PWPRG4 | 功能描述:直流/直流開關調(diào)節(jié)器 3A,Dual Non-Synch Buck Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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