Led Vrw (Pin 10); Figure 15 - Led Voltage Driver Circuit - Enfora Enabler III-G Integration Manual

Enfora Enabler III-G
Modem Integration Guide
VBAT (V)
3.6
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
Voltage out
Current
L = 2.2 μH ± 20%, RDC max = 100 m
(min: 0.25 W, max: 0.5 W);
GSM0308PB001
2 LEDs
64
Parameter/Conditions
Ω
, C = 2.2 µF ± 20% , Zener 20 V Iz typ = 5 mA (min: 4 mA, max: 10 mA), Pd typ = 0.3 W
Figure 15 – LED voltage driver circuit
41
Max current (mA)
3 LEDs
40
Min
Version DRAFT – 2/9/2007
4 LEDs
25.5
Typ Max Units
20 Vdc
60 mA