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L6730B датащи(PDF) 16 Page - STMicroelectronics

номер детали L6730B
подробное описание детали  Adjustable step-down controller with synchronous rectification
PDF  52 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6730B датащи(HTML) 16 Page - STMicroelectronics

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Device description
L6730 - L6730B
16/52
Doc ID 11938 Rev 3
5.4
Internal and external references
It is possible to set two internal references, 0.6 V and 1.2 V, or provide an external reference
from 0 V to 2.5 V. The maximum value of the external reference depends on the VCC: with
VCC = 4 V the clamp operates at about 2 V (typ.), while with VCC greater than 5 V the
maximum external reference is 2.5 V (typ).
●
VEAREF from 0% to 80% of VCCDR −> External reference
●
VEAREF from 80% to 95% of VCCDR −> VREF = 1.2 V
●
VEAREF from 95% to 100% of VCCDR −> VREF = 0.6 V
Providing an external reference from 0V to 450 mV the output voltage will be regulated but
some restrictions must be considered:
●
The minimum OVP threshold is set at 300 mV.
●
The under-voltage-protection doesn’t work.
●
The PGOOD signal remains low.
To set the resistor divider it must be considered that a 100 k
Ω pull-down resistor is
integrated into the device (see Figure 7.). Finally it must be taken into account that the
voltage at the EAREF pin is captured by the device at the start-up when Vcc is about 4 V.
Figure 6.
Bypassing the LDO



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