XC95 Torex Semiconductor, XC95 Datasheet - Page 8

• Manufacturer Part Number: XC95
• Description: 2ch. Step-up / down DC/DC Controller ICs
• Manufacturer: Torex Semiconductor

<Setting of Output Voltage>
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 1 M
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).
[External Components]
Output 1 (Step-up DC/DC controller)
Tr 1 :
SD 1 : MA2Q737
L 1:
CL1 :
Tr :
RB 1 : 500Ω
CB1 : 2200pF (Ceramic)
[Example of Calculation]
When RFB11=200kΩ and RFB12=75kΩ, V
[Typical Example]
VOUT
1.0
1.5
1.8
2.0
2.2
(V)
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 is 12V is recommended.
VST1 of XP161A1355PR is 1.2V (max.) and that of
XP161A1265PR is 1.5V (max.)
C=(CL standard value)×(IOUT1(mA)/300mA×VOUT1/VIN
* MOSFET
XP161A1355PR
CMS02
10µH
15µH
22µH
16V, 47µF
Increase capacity according to the equation below
when the step-up voltage ratio is large and output
current is high.
* NPN MOSFET
2SD1628
Set according to the equation below.
RB1 ≤ (VIN-0.7) x hFE / I
Set according to the equation below.
CB1 ≤ (2 π x RB2 x FOSC x 0.7)
The same method can be adopted for channel two (output 2) also.
XC9502 Series
RFB11
(kΩ)
220
220
330
390
30
( Adjust in accordance with load & Tr.'s HFE.)
(SANYO)
RFB12
(kΩ)
270
330
220
270
270
(Schottky , MATSUSHITA)
(Schottky, TOSHIBA)
(SUMIDA, CDRH5D28, FOSC = 500kHz)
(SUMIDA, CDRH5D28, FOSC = 300kHz)
(SUMIDA, CDRH5D28, FOSC = 180kHz)
(Tantalum)
(TOREX N-Channel Power MOSFET)
CFB1
(pF)
430
62
62
39
33
V
C
OUT
-R
VOUT
EXTBH
=0.9 × (RFB11+RFB12) /RFB12
2.5
2.7
3.0
3.3
5.0
(V)
RFB11
(kΩ)
390
360
560
200
82
OUT1
RFB12
=0.9 × (200K+75k) / 75k=3.3V.
(kΩ)
220
180
240
75
18
CFB1
(pF)
160
8
33
33
24
62
2ch. Step-up / down DC/DC Controller ICs
Output 2 (Step-down DC/DC controller)
Tr 2 :
SD 2 : MA2Q737
L 2:
CL2 :
Tr :
RB 2 : 500Ω
CB1 : 2200pF (Ceramic)
VOUT
12.0
8.0
(V)
XP162A12A6P
Note : VGS Breakdown Voltage of this Tr. is 12V so
please be careful with the power supply voltage.
CMS02
10µH
22µH
47µH
16V, 47µF
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
2SA1213
Set according to the equation below.
RB2 ≤ (VIN-0.7) x hFE / I
Set according to the equation below.
* MOSFET
* PNP MOSFET
CB2 ≤ (2 π x RB2 x FOSC x 0.7)
RFB11
(kΩ)
120
160
( Adjust in accordance with load & Tr.'s HFE.)
RFB12
(kΩ)
15
13
(Schottky , MATSUSHITA)
(SUMIDA, CDRH5D28, FOSC = 500kHz)
(SUMIDA, CDRH5D28, FOSC = 300kHz)
(SUMIDA, CDRH5D28, FOSC = 180kHz)
(Tantalum)
(SANYO)
(TOREX P-Channel Power MOSFET)
(Schottky, TOSHIBA)
CFB1
(pF)
100
82
C
-R
EXTBH
Ω
or less.