XC9502 datasheet(8/43 Pages) TOREX

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XC9502 Series

VOUT

(V)

RFB11

(kΩ)

RFB12

(kΩ)

CFB1

(pF)

VOUT

(V)

RFB11

(kΩ)

RFB12

(kΩ)

CFB1

(pF)

VOUT

(V)

RFB11

(kΩ)

RFB12

(kΩ)

CFB1

(pF)

1.0

270

430

2.5

390

220

8.0

120

100

1.5

220

330

2.7

360

180

12.0

160

1.8

220

3.0

560

240

2.0

330

270

3.3

200

2.2

390

270

5.0

160

Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based

on the values of RFB11 (RFB21) and RFB12 (RFB22). The sum of RFB11 (RFB21) and RFB12 (RFB22) should normally be 1MΩor

less.

VOUT=0.9

×(RFB11+RFB12) /RFB12

The value of CFB1 (CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2×π×CFB1×RFB11) which is

equal to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and

value of load capacity (CL).

[Example of Calculation]

When RFB11=200k

Ω and RFB12=75kΩ, VOUT1=0.9×(200k+75k) / 75k=3.3V.

[Typical Example]

The same method can be also adopted for channel two (output 2).

[External Components]

Output 1 (Step-Up DC/DC controller)

Tr 1 :

* MOSFET

XP161A1355PR (N-ch Power MOSFET, TOREX)

Note: VGS Breakdown Voltage of this Tr. is 8V so

please be careful with the power supply voltage.

For 6V power supply voltage, XP161A1265PR

which

VGS

breakdown

voltage

12V

recommended. VST1 of XP161A1355PR is 1.2V

(MAX.) and that of XP161A1265PR is 1.5V (MAX.)

SD 1: MA2Q737 (Schottky, MATSUSHITA)

CMS02

(Schottky, TOSHIBA)

L 1:

10μH

(CDRH5D28, SUMIDA, FOSC = 500kHz)

15μH

(CDRH5D28, SUMIDA, FOSC = 300kHz)

22μH

(CDRH5D28, SUMIDA, FOSC = 180kHz)

CL1 : 16V, 47μF

(Tantalum)

Increase capacity according to the equation below

when the step-up voltage ratio is large and output

current is high.

C=(CL standard value)

×(IOUT1(mA)/300mA×VOUT1/VIN)

Tr :

* NPN MOSFET 2SD1628 (SANYO)

RB1 :

500Ω ( Adjust in accordance with load & Tr.'s HFE.)

Set according to the equation below:

RB1

≦ (VIN-0.7) x hFE / IC-REXTBH

CB1 :

2200pF (Ceramic)

Set according to the equation below:

CB1

≦ (2πx RB2 x FOSC x 0.7)

Output 2 (Step-Down DC/DC controller)

Tr 2 :

* MOSFET

XP162A12A6P (P-ch Power MOSFET, TOREX)

Note: VGS Breakdown Voltage of this Tr. is 12V

so please be careful with the power supply

voltage.

SD 2: MA2Q737

(Schottky, MATSUSHITA)

CMS02

(Schottky, TOSHIBA)

L 2:

10μH

(CDRH5D28, SUMIDA, FOSC = 500kHz)

22μH

(CDRH5D28, SUMIDA, FOSC = 300kHz)

47μH

(CDRH5D28, SUMIDA, FOSC = 180kHz)

CL1 : 16V, 47μF (Tantalum)

Increase capacity according to the equation below

when the step-up voltage ratio is large and output

current is high.

C=(CL standard value)

×(IOUT2 (mA)/500mA×VOUT2/VIN

Tr :

* PNP MOSFET 2SA1213 (SANYO)

RB1 :

500Ω ( Adjust in accordance with load & Tr.'s HFE.)

Set according to the equation below:

RB2

≦ (VIN-0.7) x hFE / IC-REXTBH

CB1 :

2200pF (Ceramic)

Set according to the equation below:

CB2

≦ (2πx RB2 x FOSC x 0.7)

■OPERATIONAL EXPLANATION (Continued)

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