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MIC45404 Datasheet(PDF) 19 Page - Microchip Technology

Part # MIC45404
Description  19V 5A Ultra-Low Profile DC-to-DC Power Module
PDF  32 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC45404 Datasheet(HTML) 19 Page - Microchip Technology

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 2015 Microchip Technology Inc.
DS20005478A-page 19
MIC45404
5.0
APPLICATION INFORMATION
5.1
Programming Start-up Delay and
External UVLO
The EN/DLY pin allows programming an external
start-up delay. In this case, the driver for the EN/DLY
pin should be an open-drain/open-collector type, as
shown in Figure 5-1.
FIGURE 5-1:
Programmable Start-up Delay Function.
The start-up delay is the delay time from the off falling
edge to the assertion of the enable power delivery
signal. It can be calculated as shown in Equation 5-1:
EQUATION 5-1:
The EN/DLY pin can also be used to program a UVLO
threshold for power delivery by means of an external
resistor divider, as described in Figure 5-2.
FIGURE 5-2:
Programmable External UVLO Function.
EN/DLY
Enable Power
Comparator
EN_I
2 µA
AGND
EN_R
1.21V
VIN
Enable
Power
Delivery
150 mV
EN_LDO_R
515 mV
Enable LDO
Comparator
CDLY
Off
t
SU_DLY
EN_R
C
DLY
EN_I
-----------------------------------
=
Where:
EN_R = 1.21V
EN_I = 2 µA
CDLY = Delay programming external capacitor
EN/DLY
Enable Power
Comparator
R2
R1
EN_I
2 µA
AGND
EN_R
1.21V
VIN
Enable
Power
Delivery
150 mV
EN_LDO_R
515 mV
Enable LDO
Comparator



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