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AS3691
Datasheet
8 Detailed Functional Description
The AS3691 includes four high precision current sources (sinks). Each current source is set by an external
resistor. For internal power supply an internal shunt regulator is used. Optionally an additional 5V device can be
supplied as well with this shunt regulator.
The current sources are individually controlled by four ON inputs. If the inputs ON are high or left open, then the
current is set as follows:
ICURR 1 ? 4 =
250 mV
Ri 1 ? 4
Setting the input ON to low the current is
ICURR 1 ? 4 =
10. 0 mV
Ri 1 ? 4
for part numbers starting
with AS3691A
The current is not zero to avoid high voltage jumps on the LEDs and supplies and therefore reduce EMI.
ICURR 1 ? 4 =
0.0 mV
Ri 1 ? 4
+ I 1 ? 4 = I 1 ? 4
for part numbers starting with AS3691B; I 1-4 is the parallel current
(see above Figure 11)
8.1 Shunt Regulator
The supply of the AS3691 is generated from the high voltage supply. To obtain a 5V regulated supply, a series
resistor Rvdd is used together with an internal zener diode (shunt regulator principle). An external capacitor
Cvdd is used to filter the supply on the pin VREG.
The external resistor Rvdd has to be choosen according to the following formula:
Rvdd =
VDD MIN ? VVREGINT MAX
IVREG MAX
VDD MIN is the minimum voltage of the
supply, where Rvdd is connected
This ensures enough supply current (IVREG MAX ) for the AS3691 under minimum supply voltage VDD MIN .
If a stable 5V supply within the operating conditions limits of VREG EXT is already existing in the system it is
possible to supply the AS3691 directly. In this case remove the resistor Rvdd and connected this supply directly
to VREG.
8.2 Overtemperature Protection
If the junction temperature inside the AS3691 rises above T OVTEMP , the current sources are switched off.
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