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參數(shù)資料
| 型號： | XC9511B14CSRL |
| 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轉換器內(nèi)置LDO的同時加電壓檢測器調(diào)節(jié)器 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 180K |
| 代理商： | XC9511B14CSRL |
Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector
Preliminary
!
NOTES ON USE (Continued)
"
Application Information (Continued)
6. When the XC9511D to F series operate in PWM/PFM automatic switching control mode, the reverse current may become quite high
around the load current value when synchronous switches to non-synchronous and vise versa (also refer to no. 5 above). Under this
condition, switching synchronous rectification and non-synchronous rectification may be repeated because of the reverse current, and the
ripple voltage may be increased to 100mV or more. The reverse current is the current that flows in the PGND direction through the Nch
driver transistor from the coil. The conditions which cause this operation are as follows.
PFM Duty < Step down ratio = DCOUT / VIN x 100 (%)
PFM Duty : 30% (TYP.)
The XC9511A to C series are recommended in cases where the load current value of the DC/DC converter is close to synchronous.
#
DC/DC Waveform (1.8V, 600kHz) @ VIN=6.0V
Peak current : Ipk = (VIN - DCOUT) x OnDuty / (2 x L x Fosc) + IDOUT
9. When VIN is low, limit current may not be reached because of voltage falls caused by ON resistance or serial resistance of the coil.
11. Use of the IC at voltages below the recommended voltage range may lead to instability.
12. This IC and the external components should be used within the stated absolute maximum ratings in order to prevent damage to the device.
XC9511 Series
7. With the DC/DC converter of the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases
when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current becomes
high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate the peak current according
to the following formula:
8. When the peak current which exceeds limit current flows within the specified time, the built-in driver transistor is turned off (the integral
latch circuit). During the time until it detects limit current and before the built-in transistor can be turned off, the current for limit current
flows; therefore, care must be taken when selecting the rating for the coil or the Schottky diode.
10. In the integral latch circuit, latch time may become longer and latch operation may not work when VIN is 3.0V or more.
13. When using IC with a regulator output at almost no load, a capacitor should be placed as close as possible between AVDD and AGND
(CIN2), connected with low impedance. Please also see the recommended pattern layout on page 13 for your reference. Should it not be
possible to place the input capacitor nearby, the regulated output level may increase up to the VDD level while the load of the DC/DC
converter increases and the regulator output is at almost no load.
VIN=6.0V, IDOUT=50mA
<External Components>
L: 10
μ
H (CDRH5D28, SUMIDA)
CIN: 4.7
μ
F (ceramic)
CL: 10
μ
F (ceramic)
Step down ratio : 1.8V / 6.0V =30% <PFM Duty 31%>
Semiconductor Ltd.
CH1:LX
CH2:DCOUT
Off-set Voltage:1.8V
Data Sheet
12
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相關代理商/技術參數(shù) |
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| XC9511B14SRL | 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 |
| XC9511C1433 | 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 |
| XC9511C1434 | 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 |
| XC9511C143SRL | 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 |
| XC9511C1463 | 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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