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LM3502ITLX-35NOPB Fiches technique(PDF) 5 Page - Texas Instruments

No de pièce LM3502ITLX-35NOPB
Description  Step-Up Converter for White LED Applications
Download  28 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3502ITLX-35NOPB Fiches technique(HTML) 5 Page - Texas Instruments

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LM3502
www.ti.com
SNVS339A – SEPTEMBER 2005 – REVISED AUGUST 2006
Preliminary Electrical Characteristics
(1) (2) (continued)
Limits in standard typeface are for TJ = 25°C. Limits in bold typeface apply over the full operating junction temperature range
(
−40°C ≤ TJ ≤ +125°C). Unless otherwise specified, VIN = 2.5V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ICL
NMOS Power Switch
−16, Fb = 0V
250
400
650
Current Limit
−25, Fb = 0V
400
600
800
mA
−35, Fb = 0V
450
750
1050
−44, Fb = 0V
450
750
1050
IFb
Feedback Pin Bias
Fb = 0.25V
64
500
nA
Current (3)
FS
Switching Frequency
0.8
1
1.2
MHz
RDS(ON)
NMOS Power Switch ON ISw = 500 mA
Resistance
0.55
1.1
(Figure 4: N1)
RPDS(ON)
PMOS ON Resistance of IPMOS = 20 mA, En1 = 0V, En2 = 1.5V
VOUT1/VOUT2 Switch
5
10
(Figure 4: N1)
RNDS(ON)
NMOS ON Resistance of INMOS = 20 mA, En1 = 1.5V, En2 = 0V
VOUT2/Fb Switch
2.5
5
(Figure 4: N2)
DMAX
Maximum Duty Cycle
Fb = 0V
90
95
%
ICntrl
Cntrl Pin Input Bias
Cntrl = 2.5V
7
14
µA
Current (4)
Cntrl = 0V
0.1
ISw
Sw Pin Leakage Current
Sw = 42V, Cntrl = 0V
0.01
5
µA
(5)
IVOUT1(OFF)
VOUT1 Pin Leakage
VOUT1 = 14V, Cntrl = 0V (16)
0.1
3
Current (5)
VOUT1 = 23V, Cntrl = 0V (25)
0.1
3
µA
VOUT1 = 32V, Cntrl = 0V (35)
0.1
3
VOUT1 = 42V, Cntrl = 0V (44)
0.1
3
IVOUT1(ON)
VOUT1 Pin Bias Current
VOUT1 = 14V, Cntrl = 1.5V (16)
40
80
(5)
VOUT1 = 23V, Cntrl = 1.5V (25)
50
100
µA
VOUT1 = 32V, Cntrl = 1.5V (35)
50
100
VOUT1 = 42V, Cntrl = 1.5V (44)
85
140
IVOUT2
VOUT2 Pin Leakage
Fb = 0V, Cntrl = 0V, VOUT2 = 42V
0.1
3
µA
Current (5)
UVP
Under-Voltage
On Threshold
2.4
2.5
V
Protection
Off Threshold
2.2
2.3
OVP
Over-Voltage Protection
On Threshold (16)
14.5
15.5
16.5
(6)
Off Threshold (16)
14.0
15
16.0
On Threshold (25)
22.5
24
25.5
Off Threshold (25)
21.5
23
24.5
V
On Threshold (35)
32.0
34
35.0
Off Threshold (35)
31.0
33
34.0
On Threshold (44)
40.5
42
43.5
Off Threshold (44)
39.0
41
42.0
VEn1
PMOS FET Switch
Off Threshold (Display Lighting)
0.8
0.3
Enabling Threshold
On Threshold (Display Lighting)
1.4
0.8
V
(Figure 4: P1)
VEn2
NMOS FET Switch
Off Threshold (Display Lighting)
0.8
0.3
Enabling Threshold
On Threshold (Display Lighting)
1.4
0.8
V
(Figure 4: N2)
VCntrl
Device Enabling
Off Threshold
0.8
0.3
V
Threshold
OnThreshold
1.4
0.8
TSHDW
Shutdown Delay Time
8
12
16
ms
IEn1
En1 Pin Input Bias
En1 = 2.5V
7
14
µA
Current
En1 = 0V
0.1
(3)
Current flows out of the pin.
(4)
Current flows into the pin.
(5)
Current flows into the pin.
(6)
The on threshold indicates that the LM3502 is no longer switching or regulating LED current, while the off threshold indicates normal
operation.
Copyright © 2005–2006, Texas Instruments Incorporated
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