參數(shù)資料
型號(hào)： XC9509A036AR
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，配有穩(wěn)壓器并聯(lián)穩(wěn)壓器加電壓檢測(cè)器
文件頁(yè)數(shù)： 13/41頁(yè)
文件大小： 3619K
代理商： XC9509A036AR
13/41
XC9509
Series
●
DC/DC Waveform (3.3V, 1.2MHz) (Continued)
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:
Peak current: Ipk = (V
IN
- DC
OUT
) x OnDuty / (2 x L x Fosc) + ID
OUT
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.
9. When VI
N
is low, limit current may not be reached because of voltage falls caused by ON resistance or serial
resistance of the coil.
10. In the integral latch circuit, latch time may become longer and latch operation may not work when V
IN
is 3.0V or
more.
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.
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 (C
IN
2), connected with low impedance. Please also see the recommended pattern layout on page
14 for your reference. Should it not be possible to place the input capacitor nearby, the regulated output level may
increase up to the V
DD
level while the load of the DC/DC converter increases and the regulator output is at almost
no load.
14. Should the bi-directional load current of the synchronous DC/DC converter and the regulator become large, please
be careful of the power dissipation when in use. Please calculate power dissipation by using the following formula.
Pd=PdDC/DC + PdVR
DC/DC power dissipation (when in synchronous operation) : PdDC/DC = ID
OUT
2
x RON
VR power dissipation: PdVR=(D
COUT
– V
ROUT
) x IR
OUT
RON: ON resistance of the built-in driver transistor to the DC/DC (= 0.5
Ω
<TYP.>)
RON=Rpon x P-chOnDuty / 100
+ Rnon x (1 – P-chOnDuty / 100)
15. The voltage detector circuit built-in the XC9509 series internally monitor the V
DD
pin voltage, the DC/DC output pin
voltage and VR output pin voltage. For the XC9509B/C/E/F/K/L series, which voltage detector circuit monitors the
DC/DC output pin voltage and the VR output pin voltage, please determine the detect voltage value (VDF) by the
following equation.
V
DF
≦
(Setting voltage on both the D
COUT
voltage and the V
ROUT
voltage)
×
85%*
* An assumed value of tolerance among the D
COUT
voltage, the V
ROUT
voltage, and the VD release voltage
(The VD detect voltage and hysteresis range).
■
NOTES ON USE (Continued)
相關(guān)PDF資料
PDF描述
XC9509A036DL Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A036DR Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A03CAL Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A03CAR Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509C03CAL Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XC9509A036DL 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A036DR 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A03CAL 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A03CAR 制造商:TOREX 制造商全稱(chēng):Torex Semiconductor 功能描述:Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel Plus Voltage Detector
XC9509A03CDL 制造商:TOREX 制造商全稱(chēng):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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