Enfora Enabler III-G
Modem Integration Guide
Max current (mA)
VBAT (V)
2 LEDs
3 LEDs
4 LEDs
3.6
64
40
25.5
6.6.7. LED VRW (Pin 10)
The VRWLED voltage regulator is a step-up DC-DC converter supplying the White LEDs (20.0V/60mA).
The regulated voltage depends on the number of series White-LEDs. The main battery directly supplies
VRWLED.
VRWLED Parameter/Conditions
Min
Typ
Max
Units
Voltage out
20
Vdc
Current
60
mA
L = 2.2
μ
H ± 20%, RDC max = 100 m
Ω
, C = 2.2 µF ± 20% , Zener 20 V Iz typ = 5 mA (min: 4 mA, max: 10 mA), Pd typ = 0.3 W
(min: 0.25 W, max: 0.5 W);
Figure 15 – LED voltage driver circuit
GSM0308PB001
41
Version DRAFT – 2/9/2007