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LM5019 датащи(PDF) 13 Page - Texas Instruments

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номер детали LM5019
подробное описание детали  100-V, 100-mA Constant On-Time Synchronous Buck Regulator
PDF  30 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM5019 датащи(HTML) 13 Page - Texas Instruments

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VOUT
RFB2
VCC
RFB1
To FB
D
C1
R2
R1
D1
B
LM5019
www.ti.com
SNVS788F – JANUARY 2012 – REVISED DECEMBER 2014
(3) R1 is used to maintain the node B voltage at zero after the soft-start is finished. A value larger than the
feedback resistor divider is preferred.
With component values from the applications from the schematic shown in Figure 13, selecting C1 = 1 µF, R2 = 1
k
Ω, R1 = 30 kΩ results in a soft-start time of about 2 ms.
Figure 12. Soft-Start Circuit
7.4 Device Functional Modes
The UVLO pin controls the operating mode of the LM5019 device (see Table 2 for the detailed functional states).
Table 2. UVLO Mode
UVLO
VCC
MODE
DESCRIPTION
VCC regulator disabled.
< 0.66 V
Disabled
Shutdown
Switching disabled.
VCC regulator enabled
0.66 V to 1.225 V
Enabled
Standby
Switching disabled.
VCC regulator enabled.
VCC < 4.5 V
Standby
Switching disabled.
> 1.225 V
VCC enabled.
VCC > 4.5 V
Operating
Switching enabled.
Copyright © 2012–2014, Texas Instruments Incorporated
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Product Folder Links: LM5019



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