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LM5017 Scheda tecnica(PDF) 13 Page - Texas Instruments

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Il numero della parte LM5017
Spiegazioni elettronici  100-V, 600-mA Constant On-Time Synchronous Buck Regulator
PDF  31 Pages
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

LM5017 Scheda tecnica(HTML) 13 Page - Texas Instruments

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VOUT
RFB2
VCC
RFB1
To FB
D
C1
R2
R1
D1
B
RFB1 x RFB2
RFB1 + RFB2
tS = C1 x (R2 +
)
LM5017
www.ti.com
SNVS783I – JANUARY 2012 – REVISED OCTOBER 2015
To achieve the desired soft-start, the following design guidance is recommended:
(1) R2 is selected so that VFB is higher than 1.225 V for a VCC of 4.5 V, but is lower than 5 V when VCC is 8.55 V.
If an external VCC is used, VFB should not exceed 5 V at maximum VCC.
(2) C1 is selected to achieve the desired start-up time that can be determined from Equation 9.
(9)
(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. Note that the effect of R1 is ignored in the previous equations.
Based on the schematic shown in Figure 13, selecting C1 = 1 uF, R2 = 1 kΩ, R1 = 30 kΩ results in a soft-start
time of about 2 ms.
Figure 12. Soft-Start Circuit
7.4 Device Functional Modes
Table 2. UVLO Modes
UVLO
VCC Regulator
MODE
DESCRIPTION
VCC regulator disabled.
< 0.66 V
Disabled
Shutdown
Switching disabled.
VCC regulator enabled
0.66 V – 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 © 2012–2015, Texas Instruments Incorporated
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