Rainbow Electronics MAX8848Z - Manual (Page 6)

High-Performance Negative Charge Pump
for 7 White LEDs in 3mm x 3mm Thin QFN
MAX8848Y/MAX8848Z
6 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(V IN = 3.6V, V EN_ = V IN , circuit of Figure 1, T A = +25°C, unless otherwise noted.)
PWM DIMMING LINEARITY
PWM DUTY CYCLE (%)
LED CURRENT (mA)
80 60 40 20
5
10
15
20
25
0
0 100
MAX8848Y toc20
MAX8848Z
PWM DIMMING RESPONSE
MAX8848Y toc19
20mA/div
5V/div
V ENA
12mA
I IN
I LED1
100mA/div
0A
40µs/div
MAX8848Z
LINE TRANSIENT RESPONSE
(V IN = 3.5V TO 3.0V TO 3.5V)
MAX8848Y toc18
20mA/div
0A
100mA/div
0A
1V/div
3.5V 3.5V
3.0V
16mA
I IN
V IN
I LED1
1ms/div
ALL LEDS ON
16mA/LED
LINE TRANSIENT RESPONSE
(V IN = 3.8V TO 3.4V TO 3.8V)
MAX8848Y toc17
20mA/div
0A
200mA/div
0A
1V/div
3.8V 3.8V
3.4V
I IN
V IN
I LED1
1ms/div
ALL LEDS ON
24mA/LED
LINE TRANSIENT RESPONSE
(V IN = 4.3V TO 3.8V TO 4.3V)
MAX8848Y toc16
20mA/div
0A
200mA/div
0A
1V/div
4.3V 4.3V
3.8V
I IN
V IN
I LED1
1ms/div
ALL LEDS ON
24mA/LED