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LM3503SQ-44 датащи(PDF) 6 Page - Texas Instruments

номер детали LM3503SQ-44
подробное описание детали  Dual-Display Constant Current LED Driver with Analog Brightness Control
Download  28 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3503SQ-44 датащи(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
+
-
+
-
+
-
+
-
LM3503
SNVS329D – JULY 2005 – REVISED AUGUST 2006
www.ti.com
Block Diagram
Figure 3. Block Diagram
Detailed Description of Operation
The LM3503 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 3 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
comparator will then reset the driver logic, thus turning off the internal NMOS power device, N1, and forward
biasing the external diode. The inductor current then flows through the diode to the white LED load and output
capacitor. The inductor current recharges the output capacitor and supplies the current for the white LED load.
The oscillator then sets the driver logic again repeating the process. The output voltage of the error amplifier
controls the current through the inductor. This voltage will increase for larger loads and decrease for smaller
loads limiting the peak current in the inductor and minimizing EMI radiation. The duty limit comparator is always
operational, it prevents the internal NMOS power switch, N1, from being on for more than one oscillator cycle
and conducting large amounts of current. The light load comparator allows the LM3503 to properly regulate
light/small white LED load currents, where regulation becomes difficult for the LM3503’s primary control loop.
Under light load conditions, the LM3503 will enter into a pulse skipping pulse-frequency-mode (PFM) of operation
where the operational frequency will vary with the load. As a result of PFM mode operation, the output voltage
ripple magnitude will significantly increase.
6
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Copyright © 2005–2006, Texas Instruments Incorporated
Product Folder Links: LM3503


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