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參數(shù)資料
| 型號： | XC9511_1 |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| 中文描述： | 同步降壓型DC / DC轉(zhuǎn)換器內(nèi)置LDO的同時(shí)加電壓檢測器調(diào)節(jié)器 |
| 文件頁數(shù)： | 11/35頁 |
| 文件大小： | 3471K |
| 代理商： | XC9511_1 |
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11/35
XC9511
Series
●
Application Information
1. The XC9511 series is designed for use with a ceramic output capacitor. If, however, the potential difference
between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high
switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect
an electrolytic capacitor in parallel to compensate for insufficient capacitance.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly
influenced by external component selection, such as the coil inductance, capacitance values, and board layout of
external components. Once the design has been completed, verification with actual components should be done.
3. When the difference between V
IN
and V
OUT
is large in PWM control, very narrow pulses will be outputted, and there
is the possibility that some cycles may be skipped completely.
4. When the difference between V
IN
and V
OUT
is small, and the load current is heavy, very wide pulses will be outputted
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
■
NOTES ON USE
●
DC/DC Waveform (3.3V, 1.2MHz)
5. The IC's DC/DC converter operates in synchronous mode when the coil current is in a continuous state and
non-synchronous mode when the coil current is in a discontinuous state. In order to maintain the load current
value when synchronous switches to non-synchronous and vise versa, a ripple voltage may increase because of
the repetition of switching between synchronous and non-synchronous. When this state continues, the increase
in the ripple voltage stops. To reduce the ripple voltage, please increase the load capacitance value or use a
schottky diode externally. When the current used becomes close to the value of the load current when
synchronous switches to non- synchronous and vise versa, the switching current value can be changed by
changing the coil inductance value. In case changes to coil inductance are to values other than the
recommended coil inductance values, verification with actual components should be done.
Ics =
(V
IN
- D
COUT
) x OnDuty / (L x Fosc)
Ics: Switching current from synchronous rectification to non-synchronous rectification
OnDuty: OnDuty ratio of P-ch driver transistor (
.
=.step down ratio : D
COUT
/ V
IN
)
L: Coil inductance value
Fosc: Oscillation Frequency
I
DOUT
: The DC/DC load
current
< External Components>
L:4.7
μ
H(CDRH4D28C,SUMIDA)
CIN:4.7
μ
F(ceramic)
CL:10
μ
F(ceramic)
< External Components>
L:4.7
μ
H(CDRH4D28C,SUMIDA)
CIN:4.7
μ
F(ceramic)
CL:10
μ
F(ceramic)
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| XC9511A1434 | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511A1463 | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511A1464 | Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC951144XL10TQ144I | 制造商:Xilinx 功能描述: |
| XC9511A1433 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511A1434 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511A143SRL | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
| XC9511A1463 | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector |
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