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AS3693B
Table 20– Curreg1-16_HT_MSB
Addr: 13h-31h
CURREGX_HT_MSB
Defines High Time of PWM
austria micro systems
Bit
3:0
Bit Name
Curreg1_HT_MSB
Default
0000
Access
R/W
Description
Defines PWM high time
7.5 Shunt Regulator
The supply of the AS3693B 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 (ZD1). 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 ? 5 , 4 V
20 mA
VDD MIN is the minimum voltage of the
supply, where Rvdd is connected
This ensures enough supply current (IVREG MAX ) for the AS3693B 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 AS3693B directly. In this case remove the resistor Rvdd and connected this supply
directly to VREG.
7.5.1 Undervoltage lockout
The undervoltage lockout is an additional safety feature to prevent LED-current under abnormal Vreg conditions.
If the supply voltage Vreg is below 2.7V (e.g. device is supplied only by the voltage of the serial interface ) the
registers Reg.Control1 and RegControl2 (0x01 and 0x02) are reset. This turns off all current sinks.
Vreg
3V to 5.4V
2.7V
7.6 Over temperature control
Table 14– Overtemp Control
Reset
Reset
Register 0x01
Register 0x02
Addr:55h
Over temperature Control
Controls the temperature functions
Bit
Bit Name
Default
Access
Description
Enables the over temperature protection
0
overtemp_on
1
R/W
0 = Protection off
1 = Protection on
Displays temperature status
1
ov_temp
0
R/W
0 = Normal operation
1 = Over temperature shutdown
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