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XC9223D81DL Datasheet(PDF) 8 Page - Torex Semiconductor

Part # XC9223D81DL
Description  1A Driver Transistor Built-In Step-Down DC/DC Converters
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9223D81DL Datasheet(HTML) 8 Page - Torex Semiconductor

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XC9223/XC9224 Series
(*1) A capacitor of 2200pF0.1μF is recommended to place at the C
DD between the AGND pin and the VIN pin.
Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail.
VOUT (V)
RFB1 (k
Ω)
RFB2 (k
Ω)
CFB (pF)
VOUT (V)
RFB1 (k
Ω)
RFB2 (k
Ω)
CFB (pF)
1.0
75
300
110
2.5
510
240
15
1.2
150
300
51
3.0
330
120
24
1.5
130
150
62
3.3
470
150
18
1.8
300
240
27
5.0
430
82
18
■TYPICAL APPLICATION CIRCUIT
<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 1M
Ω or less.
VOUT = 0.8 x (RFB1 + RFB2) / RFB2
The value of CFB, speed-up capacitor for phase compensation, should be fzfb = 1 / (2 x
π x CFB1 x RFB1) which is equal to
20kHz.
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 RFB1=470k
Ω, RFB2=150kΩ,
VOUT1 = 0.8 x (470k + 150k) / 150k =3.3V
[Typical example]
[External components]
1MHz:
L: 4.7
μH (CDRH4D28C, SUMIDA)
CL: 10
μF (ceramic)
CIN: 10
μF (ceramic)
2MHz:
L: 2.2
μH (CDRH4D28, SUMIDA)
2.2
μH (VLCF4020T-2R2N1R7, TDK)
CL: 10
μF (ceramic)
CIN: 10
μF (ceramic)
* As for CIN and CL, use output capacitors of 10
μF or more. (Ceramic capacitor compatible)
* High ESR (Equivalent Series Resistance) that comes by using a tantalum or an electrolytic capacitor causes high ripple voltage.
Furthermore, it can cause an unstable operation.
Use the IC after you fully confirm with an actual device.
* When fzfb = 20kHz


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