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LM2734ZSDX Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte LM2734ZSDX
Spiegazioni elettronici  Thin SOT 1-A Load Step-Down DC-DC Regulator
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LM2734
VIN
BOOST
SW
GND
L
D1
D2
D3
R3
C4
VBOOST
CBOOST
VZ
V
IN
C
IN
V
OUT
C
OUT
LM2734Z, LM2734Z-Q1
SNVS334F – JANUARY 2005 – REVISED JANUARY 2016
www.ti.com
Feature Description (continued)
Resistor R3 must be chosen to provide enough RMS current to the Zener diode (D3) and to the BOOST pin. A
recommended choice for the Zener current (IZENER) is 1 mA. The current IBOOST into the BOOST pin supplies the
gate current of the NMOS control switch and varies typically according to Equation 8.
IBOOST = (D + 0.5) × (VZENER – VD2) mA
where
D is the duty cycle
VZENER and VD2 are in volts
IBOOST is in milliamps
VZENER is the voltage applied to the anode of the boost diode (D2)
VD2 is the average forward voltage across D2
(8)
NOTE
Equation 8 for IBOOST gives typical current.
For the worst case IBOOST, increase the current by 25%. In that case, the worse-case boost current is:
IBOOST-MAX = 1.25 × IBOOST
(9)
R3 is then given by Equation 10.
R3 = (VIN - VZENER) / (1.25 × IBOOST + IZENER)
(10)
For example, let VIN = 10 V, VZENER = 5 V, VD2 = 0.7 V, IZENER = 1 mA, and duty cycle D = 50%. Then:
IBOOST = (0.5 + 0.5) × (5 - 0.7) mA = 4.3 mA
(11)
R3 = (10 V - 5 V) / (1.25 × 4.3 mA + 1 mA) = 787
(12)
Figure 10. Boost Voltage Supplied from the Shunt Zener on VIN
7.3.3 Soft-Start
This function forces VOUT to increase at a controlled rate during start-up. During soft-start, the reference voltage
of the error amplifier ramps from 0 V to its nominal value of 0.8 V in approximately 200 µs. This forces the
regulator output to ramp up in a more linear and controlled fashion, which helps reduce inrush current.
7.3.4 Output Overvoltage Protection
The overvoltage comparator compares the FB pin voltage to a voltage that is 10% higher than the internal
reference Vref. Once the FB pin voltage goes 10% above the internal reference, the internal NMOS control
switch is turned off, which allows the output voltage to decrease toward regulation.
10
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Product Folder Links: LM2734Z LM2734Z-Q1


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