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參數資料
| 型號： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁數： | 8/66頁 |
| 文件大小： | 1264K |
| 代理商： | TPS53851RHHT |
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0.7 V
0
t - TIME
1.4 V
2.4 V
2.0 V
1.0 V
SS
WAIT
VDD
VREG
BP5
UVLO_CEx
TRKx
VOUT
PGOOD
SLUS985 – DECEMBER 2009
www.ti.com
5
APPLICATION INFORMATION
5.1
FUNCTIONAL DESCRIPTION
The TPS53851 operates with a programmable fixed switching frequency. It is a current feedback controller
with forced phase current balancing. When compared to voltage mode control, the current feedback
controller results in a simplified feedback network and reduced input line sensitivity. Phase current is
sensed by using either the DCR (direct current resistance) of the filter inductors or current sense resistors
installed in series with the output. See the section on INDUCTOR DCR CURRENT SENSE. The current
signal is then amplified and superimposed on the amplified voltage error signal to provide current mode
PWM control.
Other features include programmable input undervoltage lockout (UVLO), differential input amplifier for
precise output regulation, user programmable operation frequency, programmable pulse-by-pulse
overcurrent protection, output under-voltage shutdown and re-start, capacitor to set soft-start time and
power good indicators.
5.2
DATA SHEET ORGANIZATION
The Application Information section is partitioned to facilitate applying the TPS53851 in various modes and
configurations. The first sections describe functions that are used in all configurations. The following
sections are specific to the configuration ( i.e., single controller, multiple controllers, master and slave).
5.3
TYPICAL START UP SEQUENCE
Figure 5-1 shows a typical start up with the VDD applied to the controller and then the UVLO-CEx being
enabled. Shut down occurs when the VDD is removed.
Figure 5-1. Typical Start Up and Shut Down Sequence
16
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS53851
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