XC9129B45CSR datasheet(11/13 Pages) TOREX

Part #	XC9129B45CSR

Description	1A Driver Transistor Built-In, Step-Up DC/DC Converters

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Manufacturer	TOREX [Torex Semiconductor]

Direct Link	http://www.torex.co.jp

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11 / 13 page

11/13

XC9128/XC9129

Series

■

TEST CIRCUITS *1

Measurement method for ON resistance of the Lx switch

Using the layout of circuit No.7 above, set the LX pin voltage to 50mV by adjusting the Vpull voltage whilst the N-ch driver

transistor is turned on. Then, measure the voltage difference between both ends of Rpull. ON Resistance is calculated by using

the following formula:

RLXN=0.05 ÷ ((V1 – 0.05) ÷ 0.5)

where V1 is a voltage between SBD and Rpull. LX pin voltage and V1 are measured by an oscilloscope.

*1: The XC9129 series does not have the AEN/ pin and the FO pin. When the XC9129 series is measured, the FO and AEN

pins are not effective in the above mentioned test circuits, they are NC.

< Circuit No.2 >

< Circuit No.1 >

< Circuit No.3 >

< Circuit No.4 >

CL2

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

CIN

RL

10kΩ

Wave Form Measure Point

V

RFB1

CFB

RFB2

CL1

V

VIN

※

External Components

L

: 4.7uH(LTF5022T-4R7N2R0 : TDK)

CIN : 10uF (ceramic)

CL1 : 22uF (ceramic)

CL2 : 10uF (ceramic)

VEN

VFO

V

VMODE

A

VEN

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

VFB

VMODE

VIN

A

VOUT

VAEN/

Wave Form Measure Point

VEN

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

FB

VMODE

VIN

A

Vpull

Wave Form Measure Point

Rpull

CIN

VFO

A

CIN

※

External Components

※

External Components

※

External Components

CIN

A

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

FB

VAEN/

VMODE

VEN

VIN

A

CIN

A

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

VAEN/

VOUT

COUT

VIN

VLx

※

External Components

VEN

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

FB

VMODE

VIN

A

Vpull

Wave Form Measure Point

Rpull

CIN

VFO

A

※

External Components

VOUT

V

VAEN/

VFB

L

VEN

Lx

BAT

EN

MODE

PGND

AGND

FO

AEN/

FB

VOUT

VMODE

VIN

VOUT

CIN

※

External Components

Rpull

Vpull

SBD

Wave Form Measure Point

COUT

CLX

V1

CIN : 1uF (ceramic)

COUT : 1uF (ceramic)

CIN

: 1uF (ceramic)

Rpull : 300Ω

CIN : 1uF (ceramic)

CIN

: 1uF (ceramic)

Rpull : 300Ω

CIN

: 1uF (ceramic)

COUT : 1uF (ceramic)

SBD

: XBS304S17(TOREX)

Rpull : 0.5Ω

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