Infineon TLS820F3ELVxx, Руководство пользователя

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2.3.2 RADJ selection
The TLS820F3ELVxx features adjustable reset thresholds. By applying a voltage divider between the Q pin and
the RADJ-pin. The demoboard resistors R4 and R7 set the reset adjust threshold, see Figure 4 . There are two
different assemblies of these resistors, one for the TLS820F3ELV33 and one for the TLS820F3ELV50, see Table
2 . Equation 1 gives the formula for calculating the reset threshold. Placing the jumper as shown in Figure 5
connects the RADJ to GND and sets the default reset thresholds as shown in the datasheet. The jumper shorts
resistor R7 and causes a small permanent current through R4.
Figure 4 RADJ resistor divider schematic
Table 2 RADJ resistor divider assembly
Variant R4 R7 V
RT,lo
TLS820F3ELV33 9.4 kΩ 4.7 kΩ 2.7 V
TLS820F3ELV50 16.2 kΩ 4.7 kΩ 4 V
V
RT , lo
= V
RADJ , th
× R
4
+ R
7
R
7
≈ 0 . 9 × R
4
+ R
7
R
7
Equation 1 V
RT,lo
calculation
OPTIREG
™
linear voltage regulator TLS820F3ELVxx demoboard
Z8F68163446
2 Demoboard
User manual 8 Rev. 1.0
2020-02-26