LT1931 datasheet(4/12 Pages) LINER | 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

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LT1931 数据表(PDF) 4 Page - Linear Technology

部件名	LT1931

功能描述	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT

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制造商	LINER [Linear Technology]

网页	http://www.linear.com

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LT1931/LT1931A

1931fa

BLOCK DIAGRA

Figure 2

OPERATIO

The LT1931 uses a constant frequency, current mode

control scheme to provide excellent line and load regula-

tion. Operation can be best understood by referring to the

Block Diagram in Figure 2. At the start of each oscillator

cycle, the SR latch is set, turning on the power switch Q3.

A voltage proportional to the switch current is added to a

stabilizing ramp and the resulting sum is fed into the

positive terminal of the PWM comparator A2. When this

voltage exceeds the level at the negative input of A2, the SR

latch is reset, turning off the power switch. The level at the

negative input of A2 is set by the error amplifier (gm) and

is simply an amplified version of the difference between

the feedback voltage and the reference voltage of –1.255V.

In this manner, the error amplifier sets the correct peak

current level to keep the output in regulation. If the error

amplifier’s output increases, more current is taken from

the output; if it decreases, less current is taken. One

function not shown in Figure 2 is the current limit. The

switch current is constantly monitored and not allowed to

exceed the nominal value of 1.2A. If the switch current

reaches 1.2A, the SR latch is reset regardless of the state

of comparator A2. This current limit protects the power

switch as well as various external components connected

to the LT1931.

The Block Diagram for the LT1931A is identical except that

the oscillator is 2.2MHz and resistors R3 to R6 are one-half

the LT1931 values.

–

LATCH

0.01

Ω

DRIVER

COMPARATOR

SHUTDOWN

SHDN

–

RAMP

GENERATOR

1.2MHz

OSCILLATOR

GND

1931 BD

80k

150k

30k

x10

80k

VIN

VIN 5

NFB

CPL

(OPTIONAL)

(EXTERNAL)

VOUT

NFB

类似零件编号 - LT1931

制造商	部件名	数据表	功能描述
Linear Technology	LT1931	212Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
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	LT1931	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
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类似说明 - LT1931

制造商	部件名	数据表	功能描述
Linear Technology	LT1931	212Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
	LT1931A	454Kb / 12P	1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
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	LT3462A	233Kb / 8P	Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
	LT3462	225Kb / 8P	Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
	LT1930	190Kb / 12P	1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters
	LTC3527	2Mb / 20P	Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

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