Texas Instruments LM2695EVAL, Руководство пользователя, Страница: 7 / 11

FB
SW
C7
R2
R3
R4
0
LM2695
BST
VCC
C6
D1
ISEN
SGND
RON/SD
VIN
R1
12V - 30V
C1
200k
C2
SS
RTN
7.5k
2.49k
10V
GND
C3
R5
13
11
10
9
6
5
4
2
3
12
C8
C9
C10
R6
C11
Logic
2.5V
V
IN
GND
165k
Regulation
Comparator
2.2
P
F
0.1
P
F
Minimum
Off
Timer
On
Timer
Current
Limit
Detect
C5
0.022
P
F
C4
0.1
P
F
0.022
P
F
L1 100
P
H
V
IN
1000
pF
0.01
P
F
22
P
F
V
OUT1
V
OUT2
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Minimum Load Current
7 Minimum Load Current
The LM2695 requires a minimum load current of ≊ 500 µA to ensure the boost capacitor (C6) is recharged
sufficiently during each off-time. In this evaluation board, the minimum load current is provided by the
feedback resistor (R2, R3), allowing the board’s minimum load current at V
OUT1
(or V
OUT2
) to be specified at
zero.
Figure 6. Evaluation Board Schematic
Table 1. Bill of Materials (BOM)
Item Description Mfg., Part Number Package Value
C1, 2 Ceramic Capacitor TDK C4532X7R2A225M 1812 2.2 µF, 100 V
C3 Ceramic Capacitor TDK C2012X7R2A104M 0805 0.1 µF, 100 V
C4 Ceramic Capacitor TDK C2012X7R1C104M 0805 0.1 µF, 16 V
C5, 6 Ceramic Capacitor TDK C2012X7R1C223M 0805 0.022 µF, 16 V
C7 Ceramic Capacitor TDK C3225X7R1C226M 1210 22 µF, 16 V
C8 Unpopulated 0805
C9 Ceramic Capacitor TDK C2012X7R2A102M 0805 1000 pF
C10 Ceramic Capacitor TDK C2012X7R2A103M 0805 0.01 µF
C11 Unpopulated 0805
D1 Schottky Diode Diodes Inc. DLFS160 Power DI 123 60 V, 1A
L1 Power Inductor TDK SLF12575T-101M1R9, or Cooper 12.5 mm x 12.5 mm 100 µH, 1.9A
Bussmann DR125-101
R1 Resistor CRCW08052003F 0805 200 k Ω
R2 Resistor CRCW08057501F 0805 7.50 k Ω
R3 Resistor CRCW08052491F 0805 2.49 k Ω
R4 Resistor CRCW2512000ZR67 2512 0 Ω
R5 Unpopulated 0805
R6 Resistor CRCW08051653F 0805 165 k Ω
U1 Switching Regulator LM2695 TSSOP - 14EP
7 SNVA147A – February 2006 – Revised April 2013 AN-1444 LM2695 Evaluation Board
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