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AS3833 bảng dữ liệu(PDF) 12 Page - ams AG

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www.austriamicrosystems.com/AS3833
Revision 1.8
11 - 20
AS3833
Datasheet
8.2 VDDH_HC resistor
Figure 11. VDDH_HC resistor
Pin VDDH_HC is connected to an internal 3.3V voltage regulator. In order to keep the power dissipation of this regulator low, it is recommended
to connect pin VDDH_HC to the power supply Vin with a resistor. The resistor should guarantee sufficient voltage drop so that the remaining
voltage at pin VDDH_HC is approximately 5V. The power dissipation of the RVDDH_HC hat to be considered.
Typical values for RVVDH2 are:
VIN = 13V:
RVDDH_HC= 100Ω / 1W
VIN = 24V:
RVDDH_HC= 250Ω / 2W
8.3 Safety features
8.3.1
Undervoltage lockout
In order to avoid startup of the Boost controller at low supply voltage an undervoltage lockout function is implemented. The boost controller only
turns on when the voltage at pin UVLO exceeds VUVLO. Once the boost controller is turned on a current source IUVLO_Hyst is activated which
increases the UVLO voltage and so shifts the turn off voltage level.
Figure 12. Undervoltage lockout
R
VDDH
_HC
V
in
5V
–
75mA
--------------------
=
(EQ 2)
P
R
V DDH
_HC
75mA
(
)
2
R
VDDH
_HC
×
=
(EQ 3)



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