参数资料
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: 20/45页
文件大小: 917K
代理商: TPS40200HD
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www.ti.com
SGLS400B – OCTOBER 2009 – REVISED MAY 2010
Soft-Start Capacitor
The soft-start interval is given (in pF) by:
(18)
Where:
R = Internal 105-k
charging resistor
VCC = Input voltage up to 8 V, where the charging voltage is internally clamped to 8 V maximum
VOS = 700 mV and, because the input voltage is 12 V, VSST = 8 V
The oscilloscope output (see Figure 36) shows the expected delay at the output (middle trace) until the soft-start
node (bottom trace) reaches 700 mV. At this point, the output rises following the exponential rise of the soft-start
capacitor voltage until the soft-start capacitor reaches 1.4 V and the internal 700-mV reference takes over. This
total time is approximately 1 ms, which agrees with the calculated value of 0.95 ms where the soft-start
capacitance is 0.047 mF.
A.
Channel 1 is the output voltage rising to 3.3 V.
B.
Channel 2 is the soft-start (SS) pin.
Figure 36. Soft Start Showing Output Delay and Controlled Rise to Programmed Output Voltage
Copyright 2009–2010, Texas Instruments Incorporated
27
Product Folder Link(s): TPS40200-HT
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