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LM3502 Fiches technique(PDF) 6 Page - Texas Instruments

No de pièce LM3502
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

LM3502 Fiches technique(HTML) 6 Page - Texas Instruments

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Driver Logic
+
-
Oscillator
Current Sense
+
-
Thermal Shutdown
Duty Limit
Reference
Duty Limit
Comparator
Fb
UVP
Comparator
OVP
Comparator
PWM
Comparator
Light Load
Comparator
Light Load
Reference
VIN
Sw
VOUT1
VOUT2
Fb
En2
En1
PGND
Cntrl
AGND
N1
N2
P1
Error
Amplifier
UVP
Reference
OVP
Reference
Current Limit
Soft Start
9
15,16
12
10
14
4
7
6
2,3
13
FET Logic
+
-
+
-
Fb
Reference
Shutdown
Comparator
+
-
+
-
LM3502
SNVS339B – SEPTEMBER 2005 – REVISED MAY 2013
www.ti.com
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
IEn2
En2 Pin Input Bias
En2 = 2.5V
7
14
µA
Current
En2 = 0V
0.1
BLOCK DIAGRAM
Figure 4. Block Diagram
Detailed Description of Operation
The LM3502 utilizes an asynchronous current mode pulse-width-modulation (PWM) control scheme to regulate
the feedback voltage over specified load conditions. The DC/DC converter behaves as a controlled current
source for white LED applications. The operation can best be understood by referring to the block diagram in
Figure 4 for the following operational explanation. At the start of each cycle, the oscillator sets the driver logic
and turns on the internal NMOS power device, N1, conducting current through the inductor and reverse biasing
the external diode. The white LED current is supplied by the output capacitor when the internal NMOS power
device, N1, is turned on. The sum of the error amplifier’s output voltage and an internal voltage ramp are
compared with the sensed power NMOS, N1, switch voltage. Once these voltages are equal, the PWM
6
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Product Folder Links: LM3502


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