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LM3421 датащи(PDF) 2 Page - Texas Instruments

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номер детали LM3421
подробное описание детали  N-Channel Controllers for Constant Current LED Drivers
PDF  65 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 датащи(HTML) 2 Page - Texas Instruments

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VCC
1
EN
VIN
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
VIN
OVP
RCT
AGND
COMP
CSH
nDIM
VCC
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
OVP
nDIM
LM3421
AGND
VIN
PGND
DDRV
DAP
GATE
EN
COMP
VIN
CSH
RCT
IS
HSP
RPD
VCC
HSN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ILED
PWM
VIN (V)
100
95
90
85
80
10
15
20
25
30
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
www.ti.com
Typical Boost Application Circuit
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
VIN
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 ANALOG DIMMING 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 VO 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.
2
Submit Documentation Feedback
Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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