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TPS562201DDCR 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
稳压芯片
封装:
TSOT-23-6
描述:
4.5V 至 17V 输入、2A 输出、同步 SWIFT 降压转换器
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TPS562201DDCR数据手册
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2
ZC
XCON
PWM
Control Logic
+
+
UVP
3
Ton
One-Shot
6
VBST
+
4VFB
OCL
+
+
Soft Start
5
HS
LS
1
SS
Voltage
Reference
Ref
Hiccup
V
UVP
OCL
threshold
Regulator
UVLO
VREG5
VREG5
TSD
VIN
SW
GND
EN
Copyright © 2017, Texas Instruments Incorporated
9
TPS562201
,
TPS562208
www.ti.com
SLVSD91A –DECEMBER 2015–REVISED APRIL 2017
Product Folder Links: TPS562201 TPS562208
Submit Documentation FeedbackCopyright © 2015–2017, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The TPS562201 and TPS562208 are 2-A synchronous step-down converters. The proprietary D-CAP2 mode
control supports low ESR output capacitors such as specialty polymer capacitors and multi-layer ceramic
capacitors without complex external compensation circuits. The fast transient response of D-CAP2 mode control
can reduce the output capacitance required to meet a specific level of performance.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Adaptive On-Time Control and PWM Operation
The main control loop of the TPS562201 is adaptive on-time pulse width modulation (PWM) controller that
supports a proprietary D-CAP2 mode control. The D-CAP2 mode control combines adaptive on-time control with
an internal compensation circuit for pseudo-fixed frequency and low external component count configuration with
both low ESR and ceramic output capacitors. It is stable even with virtually no ripple at the output.
At the beginning of each cycle, the high-side MOSFET is turned on. This MOSFET is turned off after internal one
shot timer expires. This one shot duration is set proportional to the converter input voltage, V
IN
, and inversely
proportional to the output voltage, V
O
, to maintain a pseudo-fixed frequency over the input voltage range, hence
it is called adaptive on-time control. The one-shot timer is reset and the high-side MOSFET is turned on again
when the feedback voltage falls below the reference voltage. An internal ramp is added to reference voltage to
simulate output ripple, eliminating the need for ESR induced output ripple from D-CAP2 mode control.
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