TPS60230
SLVS516A – MAY 2004 – REVISED JUNE 2004
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D1 LED CURRENT
vs
DUTY CYCLE
25
500 mV/div
V
I
= 3.6 V,
I
LED
max = 20 mA
ILED(D1) − D1 LED Current − mA
20
f = 1 kHz
15
LINE TRANSIENT
EN1 = 1, EN2 = 1, V
I
= 3.6 V to 4.2 V,
I
LED
= 20 mA, 5 LEDs Connected,
I
LED(D1)
Measured With 1
W
Resistor,
T
A
= 255C
V
I
3.6 V
10
f = 32 kHz
1 mA/div
I
LED(D1)
AC
5
0
0
10
20
30
40 50 60 70
Duty Cycle − %
80
90
100
100
ms/div
Figure 7.
DIMMING RESPONSE
Figure 8.
DIMMING RESPONSE
PWM
PWM
2 V/div
0V
2 V/div
0V
PWM Into EN1 and EN2, V
I
= 3.6 V,
I
LED
= 20 mA, 5 LEDs Connected,
f = 32 kHz, T
A
= 255C
10 mA/div
10 mA/div
PWM Into EN1 and EN2, V
I
= 3.6 V,
I
LED
= 20 mA, 5 LEDs Connected,
f = 1 kHz, T
A
= 255C
I
LED(D1)
I
LED(D1)
0A
0A
5
ms/div
200
ms/div
Figure 9.
Figure 10.
8
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