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LM2734Z 데이터시트(PDF) 7 Page - Texas Instruments

부품명 LM2734Z
상세설명  LM2734Z/LM2734ZQ Thin SOT 1A Load Step-Down DC-DC Regulator
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
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LM2734Z 데이터시트(HTML) 7 Page - Texas Instruments

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LM2734
BOOST
SW
GND
L
D1
D2
COUT
CBOOST
VOUT
CIN
VIN
VIN
VBOOST
0
0
VIN
VD
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
IPK
SW
Voltage
LM2734Z
www.ti.com
SNVS334E – JANUARY 2005 – REVISED APRIL 2013
Figure 9. LM2734Z Waveforms of SW Pin Voltage and Inductor Current
BOOST FUNCTION
Capacitor CBOOST and diode D2 in Figure 10 are used to generate a voltage VBOOST. VBOOST - VSW is the gate
drive voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its on-time,
VBOOST needs to be at least 1.6V greater than VSW. Although the LM2734Z will operate with this minimum
voltage, it may not have sufficient gate drive to supply large values of output current. Therefore, it is
recommended that VBOOST be greater than 2.5V above VSW for best efficiency. VBOOST – VSW should not exceed
the maximum operating limit of 5.5V.
5.5V > VBOOST – VSW > 2.5V for best performance.
Figure 10. VOUT Charges CBOOST
When the LM2734Z starts up, internal circuitry from the BOOST pin supplies a maximum of 20mA to CBOOST.
This current charges CBOOST to a voltage sufficient to turn the switch on. The BOOST pin will continue to source
current to CBOOST until the voltage at the feedback pin is greater than 0.76V.
There are various methods to derive VBOOST:
1. From the input voltage (VIN)
2. From the output voltage (VOUT)
3. From an external distributed voltage rail (VEXT)
4. From a shunt or series zener diode
Copyright © 2005–2013, Texas Instruments Incorporated
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