APW7008
Function Description (Cont.)
LED Current Setting (Cont.)
400
350
300
250
200
150
100
50
0
0
5
10 15 20 25 30
ILED (mA)
Figure 1. RSET Value vs. LED Current
Shutdown/Enable
Pull the EN above 1.3V to enable the device and pull EN
pin below 0.3V to disable the device. In shutdown mode,
all internal control circuits are turned off and the qui-
escent current is below 2µA. When the device exits shut-
down mode, the output has soft-start function as the in-
put voltage startup.
Over-Voltage Protection
If any of LEDs is failed or unused LED channel is not
connected to VOUT, the charge pump mode will go into
2x mode and the output voltage will be pumped to 2
times the input voltage. If the output voltage is over
5.5V, the over-voltage protection circuit will limit the out-
put voltage to approximately 5.5V.
Copyright © ANPEC Electronics Corp.
14
Rev. A.3 - Feb., 2009
www.anpec.com.tw