参数资料
型号: TPS54162QPWPRQ1
厂商: TEXAS INSTRUMENTS INC
元件分类: 稳压器
英文描述: 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20
封装: GREEN, PLASTIC, HTSSOP-20
文件页数: 16/41页
文件大小: 2414K
代理商: TPS54162QPWPRQ1
Gain= A
=
mod
VIN
V
ramp
=10
(C5 + C8)
fp1 =
2
R6
(C5
C8)
p
1
fp2 =
2π × R9 × C7
1
fz1 =
2π × R6 × C5
Modulator Gain
Open Loop Error
Amp Gain
Closed Loop Gain
Compensation
Gain
20 log (10)
20 log (R6/R4)
20 log R6 (R4+R9)/(R4*R9)
fZ2
fZ1
fP1 fP2
fLC
fESR
f - Frequency - Hz
Gain
-
dB
fC
www.ti.com
SLVSA32C – OCTOBER 2009 – REVISED MAY 2010
For VIN = 8 V to 50 V, the VIN/Vramp modulator gain is approximately 10 and has a tolerance of about 20%.
(19)
Therefore,
(20)
Also, Vramp is fixed for the following range of VIN. Vramp = 1 V for VIN < 8 V, and Vramp = 5 V for VIN > 48 V.
The frequencies for poles and zeros are given by following equations.
(21)
(22)
(23)
(24)
Guidelines for selecting compensation components selection are provided in the Application Information section
of this document.
Bode Plot of Converter Gain
Figure 29.
Short-Circuit Protection
The TPS54162 features an output short-circuit protection. Short-circuit conditions are detected by monitoring the
RST_TH pin, and when the voltage on this node drops below 0.2 V, the switching frequency is decreased to
protect the device. The switching frequency is folded back to approximately 25 kHz and the current limit is
reduced to 30% of the typical current limit value.
Copyright 2009–2010, Texas Instruments Incorporated
23
Product Folder Link(s): TPS54162-Q1
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