TM
MP1528 – 9 LAMP, 36V PRECISION WHITE LED DRIVER
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit on front page, VIN = 3.6V, 9 LEDs, ILED = 20mA, VBRT = 1.2V, TA = +25°C, unless otherwise
noted.
Feedback Voltage vs
Input Voltage
Feedback Voltage vs
BRT Voltage
LED Current vs
BRT Duty Cycle @ 200Hz
430
420
410
400
390
380
370
500
400
300
200
100
0
20
18
16
14
12
10
8
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
0
1
2
3
4
5
0
20
40
60
80
100
INPUT VOLTAGE (V)
BRT VOLTAGE (V)
BRT DUTY CYCLE (%)
MP1528_TPC01
MP1528_TPC02
MP1528_TPC03
Startup into an
Open Load
Steady-State Operation
Startup
V
EN
5V/div.
V
EN
5V/div.
V
V
V
SW
10V/div.
SW
SW
10V/div.
20V/div.
V
BIAS AC
0.2V/div.
V
BIAS
20V/div.
V
I
BIAS
INDUCTOR
0.5A/div.
10V/div.
MP1528_TPC06
MP1528_TPC05
MP1528_TPC04
Efficiency vs
LED Current
(9 LEDs)
Efficiency vs
LED Current
(8 LEDs)
Efficiency vs
LED Current
(6 LEDs)
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
30
100
90
80
70
60
50
40
30
V
=
V
=
IN
IN
V
=
IN
12V
7.5V
5V
4.2V
3V
12V
7.5V
5V
4.2V
3V
12V
7.5V
5V
4.2V
3V
0
5
10
15
20
25
0
5
10
15
20
25
0
5
10
15
20
25
LED CURRENT (mA)
LED CURRENT (mA)
LED CURRENT (mA)
MP1528_TPC08
MP1528_TPC09
MP1528_TPC07
MP1528 Rev. 1.7
2/21/2006
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4
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