参数资料
型号: LM3421-SEPICEV/NOPB
厂商: National Semiconductor
文件页数: 2/67页
文件大小: 0K
描述: BOARD EVAL FOR LM3421
标准包装: 1
系列: PowerWise®
电流 - 输出 / 通道: 350mA
输出及类型: 1,非隔离
输出电压: 18.9V
特点: 可调光
输入电压: 8 ~ 18 V
已供物品: 板,文档
已用 IC / 零件: LM3421
SNVS574E – JULY 2008 – REVISED MAY 2013
100
95
90
85
80
10
15
20
25
30
V IN (V)
Figure 1. Boost Evaluation Board
9 Series LEDs at 1A
Connection Diagrams
Top View
Top View
V IN
1
16 HSN
V IN
1
20 HSN
EN
2
15 HSP
EN 2
19 HSP
COMP 3
14 RPD
COMP 3
18 RPD
CSH 4
RCT 5
AGND 6
OVP 7
nDIM 8
DAP
17
13 IS
12 V CC
11 GATE
10 PGND
DDRV
9
CSH 4
RCT 5
AGND 6
OVP 7
nDIM 8
DAP
21
17 IS
16 V CC
15 GATE
14 PGND
13 DDRV
FLT 9
TIMR 10
12 DPOL
11 LRDY
Figure 2. 16-Lead TSSOP
Package Number PWP
PIN DESCRIPTIONS
Figure 3. 20-Lead TSSOP
Package Number PWP
LM3423
1
2
3
LM3421
1
2
3
Name
V IN
EN
COMP
Description
Input Voltage
Enable
Compensation
Function
Bypass with 100 nF capacitor to AGND as close to the device as
possible in the circuit board layout.
Connect to AGND for zero current shutdown or apply > 2.4V to
enable device.
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.
5
6
5
6
RCT
AGND
Resistor Capacitor Timing
Analog Ground
External RC network sets the predictive “off-time” and thus the
switching frequency.
Connect to PGND through the DAP copper pad to provide 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.
2
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1
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