TPS62203DBVT

更新时间： 2024-01-09 17:17:38

品牌	Logo	应用领域
德州仪器 - TI		转换器功效 DC-DC转换器
页数	文件大小	规格书
24页	905K
描述
HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER

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数据手册

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TPS62203DBVT 数据手册

TPS62200, TPS62201

TPS62202, TPS62203, TPS62207

TPS62204, TPS62205, TPS62208

www.ti.com

SLVS417E–MARCH 2002–REVISED MAY 2006

FUNCTIONAL BLOCK DIAGRAM

Current Limit Comparator

Undervoltage

Lockout

Bias Supply

REF

Skip Comparator

REF

Soft Start

1 MHz

Oscillator

(COMP)

P-Channel

Power MOSFET

Comparator

Driver

Shoot-Through

Logic

Control

Logic

Sawtooth

Generator

N-Channel

Power MOSFET

Comparator High

Comparator Low

Comparator Low 2

Load Comparator

Comparator High

Compensation

Comparator Low

Comparator Low 2

See Note

REF

= 0.5 V

GND

For the adjustable version (TPS62200) the internal feedback divider is disabled and the FB pin is directly connected

to the internal GM amplifier

DETAILED DESCRIPTION

OPERATION

The TPS6220x is a synchronous step-down converter operating with typically 1-MHz fixed frequency pulse width

modulation (PWM) at moderate to heavy load currents and in power save mode operating with pulse frequency

modulation (PFM) at light load currents.

During PWM operation the converter uses a unique fast response, voltage mode, controller scheme with input

voltage feed forward. This achieves good line and load regulation and allows the use of small ceramic input and

output capacitors. At the beginning of each clock cycle initiated by the clock signal (S), the P-channel MOSFET

switch is turned on, and the inductor current ramps up until the comparator trips and the control logic turns off

the switch. The current limit comparator also turns off the switch in case the current limit of the P-channel switch

is exceeded. Then the N-channel rectifier switch is turned on and the inductor current ramps down. The next

cycle is initiated by the clock signal again turning off the N-channel rectifier and turning on the P-channel switch.

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