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參數(shù)資料
| 型號(hào)： | XC9511A14SRL |
| 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(cè)器調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 180K |
| 代理商： | XC9511A14SRL |
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Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
!
NOTES ON USE
"
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.
#
DC/DC Waveform (3.3V, 1.2MHz)
Ics=
(VIN - DCOUT) 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 : DCOUT / VIN)
L : Coil inductance value
Fosc : Oscillation Frequency
IDOUT : The DC/DC load current
XC9511 Series
3. When the difference between VIN and VOUT 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 VIN and VOUT 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.
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.
Semiconductor Ltd.
CH1:LX
CH2:DCOUT
Off-set Voltage:3.3V
VIN=3.7V, IDOUT=100mA
<External Components>
L: 4.7
μ
H (CDRH4D28C, SUMIDA)
CIN: 4.7
μ
F (ceramic)
CL: 10
μ
F (ceramic)
CH2:DCOUT
Off-set Voltage:3.3V
VIN=3.5V, IDOUT=100mA
<External Components>
L: 4.7
μ
H (CDRH4D28C, SUMIDA)
CIN: 4.7
μ
F (ceramic)
CL: 10
μ
F (ceramic)
CH1:LX
Data Sheet
11
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| XC9511B1433 | 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 |
| XC9511B1434 | 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 |
| XC9511B143SRL | 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 |
| XC9511B1463 | 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 |
| XC9511B1464 | 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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