XC9103 Просмотр технического описания (PDF) - TOREX SEMICONDUCTOR

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XC9103

Ceramic Cap. Compatible Step-Up DC/DC Converters

TOREX SEMICONDUCTOR 

XC9103/04/05 Series

Ceramic Cap. Compatible Step-Up DC/DC Converters

" FUNCTIONAL SETTINGS

< Output Voltage Setting>

Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB1 and

RFB2. The sum of RFB1 and RFB2 should normally be 2 MΩ or less.

VOUT = 0.9 x (RFB1 + RFB2) / RFB2

The value of CFB1, speed-up capacitor for phase compensation, should result in fzfb = 1/(2 π × CFB × RFB1) equal to 5 to 30kHz. Adjustments

are required depending on the application, value of inductance (L), and value of load capacity (CL).

fzfb = 30kHz (L=10µH)

[ Example of Equation ]

fzfb = 20kHz (L=22µH)

RFB1 : 120kΩ

RFB2 : 45kΩ

fzfb = 10kHz (L=47µH)

CFB : 47pF (fzfb = 30kHz, L = 10µH)

68pF (fzfb = 20kHz, L = 22µH)

130pF (fzfb = 10kHz, L = 47µH)

< The use of ceramic capacitor CL >

The circuit of the XC9103/04/05 series is organized by a specialized circuit which reenacts negative feedback of both voltage and current. Also

by insertion of approximately 100mΩ of a low and inexpensive sense resistor as current sense, a high degree of stability is possible even using

a ceramic capacitor, a condition which used to be difficult to achieve. Compared to a tantalum condenser, because the series can be operated

in a very small capacity, it is suited to use of the ceramic capacitor which is cheap and small.

< External Components >

Tr:

*When a MOSFET is used :

XP161A1355PR (TOREX Nch. Power MOSFET)

Note* : As the breakdown voltage of XP161A1355 is 8V, take

care with the power supply voltage. With output voltages over

6V, use the XP161A1265 with a breakdown voltage of 12V.

VST1: XP161A1355 PR =1.2V (max.)

XP161A1265PR = 1.5V (max.)

*When a NPN Tr. Is used :

2SD1628 (Sanyo)

Rb : 500Ω (adjust with Tr's HSE or load)

Cb : 2200pF (ceramic type)

Cb ≤ 1 / (2π × Rb× FOSC × 0.7)

SD:

L, CL:

L:

CL:

RSENSE:

MA2Q737 (Schottky type, MATSUSHITA)

When using ceramic type

22µH (SUMIDA CDRH5D28, FOSC = 100, 180kHz)

10µH (SUMIDA CDRH5D18, FOSC = 300, 500kHz)

10V 10µF (ceramic type, TAIYO YUDEN LMK325BJ106ML))

Use the formula below when step-up ratio and output current is large.

CL = (CL standard value) x (IOUT(mA) / 300mA x VOUT / VIN)

100mΩ (FOSC = 180, 300, 500kHz)

50mΩ (FOSC = 100kHz)

CL:

L:

CL:

RSENSE:

Tantalum Type

22µH (SUMIDA CDRH5D28, FOSC = 300kHz)

47µH (SUMIDA CDRH5D28, FOSC = 100, 180kHz)

Except when IOUT(mA) / 100mA × VOUT / VIN > 2 → 22µH

10µH (SUMIDA CDRH5D18, FOSC = 500kHz)

16V 47µF (tantalum type NICHICHEMI 16MCE476MD2)

Use the formula below when step-up ratio and output current is large.

CL = (CL standard value) × (IOUT(mA) / 300mA × VOUT / VIN)

Not required, but short out the wire.

CL:

L:

CL:

RSENSE:

CFB:

AL Electrolytic Type

22µH (SUMIDA CDRH5D28, FOSC = 300kHz)

47µH (SUMIDA CDRH5D28, FOSC = 100, 180kHz)

Except when IOUT(mA) / 100mA × VOUT / VIN > 2 → 22µH

16V 100µF (AL electrolytic type) + 10V 2.2µF (ceramic type)

Strengthen appropriately when step-up ratio and output current is large.

Not required, but short out the wire.

Set up so that fzfb = 100kHz.

8

Semiconductor Ltd.

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