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參數資料
| 型號： | XC9104 |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Step-Up DC/DC Converters |
| 中文描述： | 升壓型DC / DC轉換器 |
| 文件頁數： | 8/19頁 |
| 文件大小： | 205K |
| 代理商： | XC9104 |
"
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 M
or less.
VOUT = 0.9 x (RFB1 + RFB2) / RFB2
fzfb = 30kHz (L=10
μ
H)
fzfb = 20kHz (L=22
μ
H)
fzfb = 10kHz (L=47
μ
H)
[ Example of Equation ]
RFB1 : 120k
CFB :
47pF
68pF
130pF
RFB2 : 45k
(fzfb = 30kHz, L = 10
μ
H)
(fzfb = 20kHz, L = 22
μ
H)
(fzfb = 10kHz, L = 47
μ
H)
< 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 100m
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
: 500
(adjust with Tr's HSE or load)
Cb
: 2200pF (ceramic type)
Cb
≤
1 / (2
π
×
Rb
×
FOSC
×
0.7)
SD:
MA2Q737 (Schottky type, MATSUSHITA)
When using ceramic type
22
μ
H (SUMIDA CDRH5D28, FOSC = 100, 180kHz)
10
μ
H (SUMIDA CDRH5D18, FOSC = 300, 500kHz)
10V 10
μ
F (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)
100m
(FOSC = 180, 300, 500kHz)
50m
(FOSC = 100kHz)
L, CL:
L:
CL:
RSENSE:
CL:
L:
Tantalum Type
22
μ
H (SUMIDA CDRH5D28, FOSC = 300kHz)
47μ
H (SUMIDA CDRH5D28, FOSC = 100, 180kHz)
Except when IOUT(mA) / 100mA
×
VOUT / VIN > 2
→
22
μ
H
10
μ
H (SUMIDA CDRH5D18, FOSC = 500kHz)
16V 47
μ
F (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:
RSENSE:
CL:
L:
AL Electrolytic Type
22
μ
H (SUMIDA CDRH5D28, FOSC = 300kHz)
47μ
H (SUMIDA CDRH5D28, FOSC = 100, 180kHz)
Except when IOUT(mA) / 100mA
×
VOUT / VIN > 2
→
22
μ
H
16V 100
μ
F (AL electrolytic type) + 10V 2.2
μ
F (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.
CL:
RSENSE:
CFB:
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).
XC9103/04/05 Series
Ceramic Cap. Compatible
Step-Up DC/DC Converters
Semiconductor Ltd.
8
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| XC9104B091MR | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Ceramic Capacitor Compatible, Step-up DC/DC Controllers |
| XC9104B092DL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Ceramic Capacitor Compatible, Step-up DC/DC Controllers |
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