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SPM1006 Datasheet(PDF) 13 Page - Sumida Corporation

Part No. SPM1006
Description  4-28V Input 8A Output Power Supply in Inductor (PSI2) Module
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Maker  SUMIDA [Sumida Corporation]
Homepage  http://www.sumida.com
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SPM1006 Datasheet(HTML) 13 Page - Sumida Corporation

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SPM1006
Version 1.5
March 16, 2016
Page 13 of 22
Fig. 19 Start-up with pre-bias 2.62V (VOUT=5V)
Fig. 20 Start-up with pre-bias 4.21V (VOUT=5V)
Start Up Voltage
By default, the SPM1006 will turn on when the input voltage reaches the startup voltage (VSTART). The SPM1006 will
turn off when the input voltage reduces to below the Under Voltage Lock-Out (UVLO) level. Startup voltage cannot be
reduced below the values provided in the table of Electrical Characteristics. Startup voltage can be increased by an
external resistor (REN) connected between EN pin and PGND pin.
The resistor value REN (in kΩ) can be calculated using equation (3) below based on the required start up voltage, VSTART.
Note: VSTART must be higher than 3.9V.
)
4
5
(
400
START
EN
V
R
(3)
For example, to set the start-up voltage to 9.0V the value of REN will be 9.76 kΩ.
The shutdown voltage is given by equation (4) below:
EN
EN
SHUTDOWN
R
R
V
)
100
(
*
4
.
0
(4)
For example, if REN = 9.76 kΩ the shutdown voltage will be 4.5V.
Power Good (PWRGD)
The PWRGD pin is an open drain output. Connect a pull up resistor (10kΩ to 100kΩ) between PWRGD pin and VAUX
pin, or to a suitable external voltage. [Note: maximum voltage on this pin is VIN, but any lower voltage logic level can
be used.] PWRGD signal becomes high when the output voltage reaches 90% of normal output voltage. The PWRGD
signal becomes low when the output voltage is lower than 80% or higher than 120% of the normal output voltage.
Soft Start Operation
Soft-start operation is internal to the SPM1006. It has an internally programmed fixed start-up time of 600us nominal
for any output voltage setting and load current.
Ch1 Blue = VIN
CH3 Violet = PWRGD
CH4 Green = VOUT
Ch1 Blue = VIN
CH3 Violet = PWRGD
CH4 Green = VOUT


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