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LM4510SDEV 数据表(PDF) 14 Page - Texas Instruments

部件名 LM4510SDEV
功能描述  LM4510 Synchronous Step-Up DC/DC Converter with True Shutdown Isolation
PDF  23 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM4510SDEV 数据表(HTML) 14 Page - Texas Instruments

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+
)
7
.
- 0
V
(
x
C
=
t
IN
OUT
SS
I
CHARGE
_
INIT
I
CHARGE
_
SS
V
x
C
FB
S
VEN
appropriate VOUT
VSS = VFB
VOUT = VIN - 0.7V
VSS
VSS = VIN
VOUT
LM4510
SNVS533C – SEPTEMBER 2007 – REVISED MAY 2013
www.ti.com
Table 3. Suggested CIN and COUT Capacitors and Their Suppliers
Case Size
Model
Type
Vendor
Voltage Rating
Inch (mm)
4.7 µF for CIN
C2012X5R0J475
Ceramic, X5R
TDK
6.3V
0805 (2012)
GRM21BR60J475
Ceramic, X5R
muRata
6.3V
0805 (2012)
JMK212BJ475
Ceramic, X5R
Taiyo-Yuden
6.3V
0805 (2012)
C2012X5R0J475K
Ceramic, X5R
TDK
6.3V
0603 (1608)
10 µF for COUT
TMK316BJ106KL
Ceramic, X5R
Taiyo-Yuden
25V
1206 (3216)
12103D106KAT2A
Ceramic, X5R
AVX
25V
1210 (3225)
SOFT-START FUNCTION AND SOFT-START CAPACITOR SELECTION
The LM4510 has a soft-start pin that can be used to limit the input inrush current. Connect a capacitor from SS
pin to GND to set the soft-start period. Figure 27 describes the soft start process.
•
Initial charging period: When the device is turned on, the control circuitry linearly regulating initial charge
current charges VOUT by limiting the inrush current.
•
Soft-start period: After VOUT reaches VIN -0.7V (typ.), the device starts switching and the CS is charged at a
constant current of 11
μA, ramping up to VIN. This period ends when VSS reaches VFB. CS should be large
enough to ensure soft-start period ends after CO is fully charged.
During the initial charging period, the required load current must be smaller than the initial charge current to
ensure VOUT reaches VIN -0.7V (typ.).
Figure 27. Soft Start Timing Diagram
CS Selection
The soft-start time without load can be estimated as:
(8)
Where the IINIT_CHARGE is Initial Charging Current depending on VIN and ISS_CHARGE (11 μA (typ.)). Also, when
selecting the fuse current rating, make sure the value is higher than the initial charging current.
COMPENSATION COMPONENT SELECTION
The LM4510 provides a compensation pin COMP to customize the voltage loop feedback. It is recommended
that a series combination of RC and CC1 be used for the compensation network, as shown in the typical
application circuit. In addition, CC2 is used for compensating high frequency zeros.
14
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Copyright © 2007–2013, Texas Instruments Incorporated
Product Folder Links: LM4510



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