Texas Instruments LM3423 Evaluation Board LM3423BBLSCSEV/NOPB LM3423BBLSCSEV/NOPB 데이터 시트
제품 코드
LM3423BBLSCSEV/NOPB
V
CC
1
EN
V
IN
OVP
RCT
FLT
DPOL
DDRV
HSP
AGND
COMP
CSH
DAP
RPD
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
nDIM
TIMR
LRDY
PGND
GATE
HSN
IS
21
V
IN
OVP
RCT
AGND
COMP
CSH
nDIM
V
CC
1
EN
DDRV
HSP
DAP
RPD
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PGND
GATE
HSN
IS
17
V
IN
(V)
EF
F
IC
IEN
C
Y
(%
)
100
95
90
85
80
10
15
20
25
30
SNVS574E – JULY 2008 – REVISED MAY 2013
Figure 1. Boost Evaluation Board
9 Series LEDs at 1A
Connection Diagrams
Top View
Top View
Figure 2. 16-Lead TSSOP
Figure 3. 20-Lead TSSOP
Package Number PWP
Package Number PWP
PIN DESCRIPTIONS
LM3423
LM3421
Name
Description
Function
Bypass with 100 nF capacitor to AGND as close to the device as
1
1
V
IN
Input Voltage
possible in the circuit board layout.
Connect to AGND for zero current shutdown or apply > 2.4V to
2
2
EN
Enable
enable device.
3
3
COMP
Compensation
Connect a capacitor to AGND to set the compensation.
Connect a resistor to AGND to set the signal current. For analog
4
4
CSH
Current Sense High
dimming, connect a controlled current source or a potentiometer to
AGND as detailed in the
AGND as detailed in the
section.
External RC network sets the predictive “off-time” and thus the
5
5
RCT
Resistor Capacitor Timing
switching frequency.
Connect to PGND through the DAP copper pad to provide ground
6
6
AGND
Analog Ground
return for CSH, COMP, RCT, and TIMR.
Connect to a resistor divider from V
O
to program output over-voltage
7
7
OVP
Over-Voltage Protection
lockout (OVLO). Turn-off threshold is 1.24V and hysteresis for turn-on
is provided by 23 µA current source.
is provided by 23 µA current source.
2
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