Texas Instruments LM5160, Руководство пользователя

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2.2μF
C1
2.2μF
C10
0.47μF
C2
TP1
DNP
DNP
R9
127k
R1
18.2k
R2
169k
R3
DNP
R5
1 2 3
JP1
0.022uF
C3
0.01μF
C4
C6
DNP
3.01k
R6
2.00k
R7
0.47
R8
10μF
C9
10μF
C8
TP2
1
2
3
Q1
DNP
GND
GND
GND GND
GND
GND GND
0
R4
1 F μ
C5
C7
DNP
1
2
J1
1
2
J2
VIN 10 - 60VDC
VOUT 5VDC @ 1.5A
AGND
1
PGND
2
VIN
3
EN/UVLO
4
RON
5
SS
6
FPWM
7
FB
8
VCC
9
BST
10
SW
11
SW
12
PAD
U1
LM5160DNT
L1
47uH
GND
Schematic
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Figure 3. EVM Bottom Copper View with LM5160A Figure 4. EVM Top Solder Mask with LM5160A
Figure 1 to Figure 4 show the board layout for the LM5160DNTBKEVM PCB. The WSON-12 package
allows a compact leadless IC package buck regulator solution. The LM5160DNTBKEVM is a simple two
layer board. In this EVM, the necessary feedback ripple voltage ( V
FB
) required for stable COT operation
over the entire input voltage range is generated by the inductor current flowing through the resistor, R
ESR
(R8 as shown in Figure 1 ). This is the least component, minimum cost ripple configuration. There are
placeholders in the EVM ( R7, C6, and C7) which can be populated as required, for the minimum ripple
injection network. If this external ripple configuration is used, substitute R8 with a 0
Ω (0805) resistor.
Calculate these component values based on the formulae mentioned under Type 3 ripple configuration in
the LM5160, LM5160A Datasheet (
SNVSA03A ). See application note AN-1481 for more details for each
ripple generation method.
5 Schematic
Figure 5. Buck EVM Schematic with LM5160
When/If used with LM5160, the placeholder for D1 as in Figure 1 , must remain unpopulated under all
cases. When evaluating the LM5160A, the designer needs to use the same standard EVM by replacing
the LM5160 IC (when/if populated) with the LM5160A. No other components on board need to be
replaced or removed. With LM5160A IC, the designer can use other nominal output voltage (V
OUT
), set
between 9 V and 13 V, to externally drive the V
CC
for improved efficiency requirement. In that case, the
diode in placeholder D1 can be appropriately populated, to the correct voltage ratings. More detail is given
in
Section 6 in the Bill of Materials. For more information about the difference between LM5160A and
LM5160, please refer to the LM5160 Datasheet ( SNVSA03A ).
6 LM5160A, LM5160 User’s Guide SNVU441B – October 2014 – Revised April 2015
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