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LM34922MY/NOPB Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM34922MY/NOPB
Description  28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
PDF  19 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM34922MY/NOPB Datasheet(HTML) 11 Page - Texas Instruments

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Voltage
at CS
0V
VRIPPLE
tOFF
tON
Inductor
Current
'I
(3a)
Current
Limit Threshold
Normal
Operation
Load
Current
Increases
Current
Limited
'I
Inductor
Current
Decreases
Load Current
Normal
Operation
Voltage at the FB Pin
2.51V
Voltage at the CS Pin
0V
IPK
IO1
IO2
IOCL
LM34922
www.ti.com
SNVS813A – JUNE 2012 – REVISED MARCH 2013
Figure 16. Normal and Current Limit Operation
Ripple Requirements
The LM34922 requires a minimum of 15mVp-p ripple voltage at the CS pin. That ripple voltage is generated by
the decreasing recirculating current (the inductor’s ripple current) through RS during the off-time. See Figure 17.
Figure 17. CS Pin Waveform
The ripple voltage is equal to:
VRIPPLE = ΔI x RS
where
•
ΔI is the inductor current ripple amplitude
•
RS is the current sense resistor at the CS pin
(7)
N-Channel Buck Switch and Driver
The LM34922 integrates an N-Channel buck switch and associated floating high voltage gate driver. The gate
driver circuit works in conjunction with an external bootstrap capacitor (CBST) and an internal high voltage diode.
A 0.1µF capacitor connected between BST and SW provides the supply voltage for the driver during the on-time.
During each off-time, the SW pin is at approximately -1V, and CBST is recharged from the internal 5V regulator for
the next on-time. The minimum off-time ensures a sufficient time each cycle to recharge the bootstrap capacitor.
Copyright © 2012–2013, Texas Instruments Incorporated
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