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MP3302DD-LF-Z

P1-P3P4-P6P7-P9P10-P12
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
MP3302 Rev. 0.98 www.MonolithicPower.com 4
5/5/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
PIN FUNCTIONS
TSOT23-5
Pin #
QFN8
Pin #
Name Pin Function
1 8 SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW. SW can swing between GND
and 36V.
2 1, 5
GND,
Exposed
Pad
Ground. Connect exposed pad to GND plane for proper thermal performance.
3 6 FB
Feedback Input. The MP3302 regulates the voltage across the current sense
resistor between FB and GND. Connect a current sense resistor from the
bottom of the LED string to GND. Connect the bottom of the LED string to FB.
The regulation voltage is 200mV.
4 4 EN
ON/OFF Control and Dimming Command Input. A voltage greater than 0.6V
will turn the part on and less than 0.4V will turn the part off. If the EN pin
voltage is between 0.7V and 1.4V, V
FB
is regulated between 0V and 200mV.
To use PWM dimming, apply a 200Hz to 1KHz square wave signal with
amplitude greater than 1.5V to this pin.
5 2 IN Input Supply Pin. Must be locally bypassed.
3 NC No Connect.
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
MP3302 Rev. 0.98 www.MonolithicPower.com 5
5/5/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 5V, 3WLEDs 9Strings, unless otherwise noted.
V
SW
10V/div.
V
EN
2V/div.
V
OUT
5V/div.
V
EN
2V/div.
V
EN
5V/div.
V
OUT
5V/div.
I
LED
100mA/div.
Enable Startup
V
SW
10V/div.
I
LED
100mA/div.
V
EN
5V/div.
V
OUT
5V/div.
V
SW
10V/div.
I
LED
100mA/div.
Enable Shutdown
PWM Dimming
V
SW
20V/div.
V
OUT
20V/div.
Start Up into Openload
V
SW
10V/div.
V
FB
50mV/div.
V
OUT
AC Coupled
100mV/div.
I
inductor
500mA/div.
400ns/div.
Steady State Operation
V
IN
= 5V, 3 WLEDs,9 Strings
V
IN
= 5V, 3 WLEDs,9 StringsV
IN
= 5V, 3 WLEDs,9 Strings V
IN
= 5V
V
IN
= 5V, 3 WLEDs,9 Strings
f=1kHz
V
IN
=5V, 3 WLEDs, 9 Strings
V
IN
=5V, 3 WLEDs, 9 Strings
0 0.2 0.4 0.8 1
PWM DIMMING DUTY
Output Current vs
PWM Dimming Duty
200
180
160
140
120
100
80
60
40
20
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
0.6
0
200
180
160
140
120
100
80
60
40
20
0
0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
EN PIN VOLTAGE (V)
Output Current vs
Analog Dimming Voltage
EFFICIENCY (%)
3
60
65
70
75
80
85
90
95
4
56
INPUT VOLTAGE(V)
3 WLEDs,9 Strings
6 WLEDs
8 WLEDs
10WLEDs
Efficiency vs
Input Voltage
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
MP3302 Rev. 0.98 www.MonolithicPower.com 6
5/5/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
OPERATION
The MP3302 uses a constant frequency, peak
current mode boost regulator architecture to
regulate the series string of white LEDs. The
operation of the MP3302 can be understood by
referring to the block diagram of Figure 1.
At the start of each oscillator cycle the FET is
turned on through the control circuitry. To
prevent sub-harmonic oscillations at duty cycles
greater than 50 percent, a stabilizing ramp is
added to the output of the current sense
amplifier and the result is fed into the positive
input of the PWM comparator. When this
voltage equals the output voltage of the error
amplifier the power FET is turned off.
The voltage at the output of the error amplifier
is an amplified version of the difference
between the 200mV reference voltage and the
feedback voltage. In this way the peak current
level keeps the output in regulation.
If the feedback voltage starts to drop, the output
of the error amplifier increases. This results in
more current flowing through the power FET,
thus increasing the power delivered to the
output.
PWM
COMPARATOR
AMPLIFIER
200mV for
Full Brightness
Enable
CONTROL
LOGIC
CURRENT
SENSE
AMPLIFIER
SW
M1
GND
-
+
FB
EN
1.3MHz
OSC
ENABLE &
DIMMING
CONTROL
-
+
+
-
+
Figure 1—Functional Block Diagram
P1-P3P4-P6P7-P9P10-P12

MP3302DD-LF-Z

Mfr. #:
Buy MP3302DD-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 1.3A, 1.3MHz WLED Driver
Lifecycle:
New from this manufacturer.
Delivery:
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