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FYUCE
FYUCE
Visitor II
January 31, 2019
Question

How can I enable spv1050 ldo's

  • January 31, 2019
  • 2 replies
  • 716 views

I have an eval board steval-isv019v1. It is for boost config of spv1050. ​I connected pv yo pv input connector, a li-po battery to battery output and a 22kohm load to ldo output. I measure pv input voltage as 1.5 volts, store voltage as 3.92 volts and ldo_en pin voltage as about same as store voltage. But ldo outputs are 0 volts. How can I enable ldo's. Do I need any thing else? Whats wrong with my eval board?

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2 replies

SLesh.1
SLesh.1
Associate II
July 26, 2020

I have the same problem. I have made my own board. LDO_EN connected to STORE line via 10k resistor. Solar buttery is connected, STORE has nearly 4,15 V, but LDO - zero... What can be wrong? Does LDO_EN(1,2) lines have internal pull up? How can I use LDO?

Peter BENSCH
Peter BENSCH
ST Technical Moderator
July 27, 2020

Please check the logic level of LDO1_EN and/or LDO2_EN acording to the datasheet of SPV1050. At page 12 of the current revision 5 you will find the minimum input voltages of these enable pins.

The STEVAL-ISV019V1 uses two jumpers SW1/SW2 to set these pins. To enable the LDO the pins LDO1_EN/LDO2_EN need to set to 1, i.e. the respective jumpers between pin3-pin2, while pin1 is at the side of the ST logo, where you also find the white text "SW1" or "SW2" of the silkscreen. The default setting should be between pin3-pin4, which disables both LDO.

Good luck!

/Peter

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