ST ISA093V1 User Manual
STEVAL-ISA093V1
3 A step-down switching power supply demonstration board based on the L7981 (QFN)
Data brief
Features
■3 A DC output current
■4.5 V to 28 V input voltage
■Output voltage adjustable from 0.6 V
■250 kHz switching frequency, programmable up to 1 MHz
■Internal soft-start and enable
■Low dropout operation: 100% duty cycle
■Voltage feed-forward
■Zero load current operation
■Overcurrent and thermal protection
■RoHS compliant
STEVAL-ISA093V1
Description
The STEVAL-ISA093V1 is a step-down switching power supply based on STMicroelectronics’ L7981 switching regulator in a QFN package.
The L7981 features an embedded power MOSFET and is capable of delivering up to 3 A of current to the load, depending on the application conditions.
The input voltage can range from 4.5 V to 28 V, while the output voltage can be set from 0.6 V to VIN.
Requiring a minimum number of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz.
December 2011 |
Doc ID 022618 Rev 1 |
1/4 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
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Schematic diagram |
STEVAL-ISA093V1 |
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1 Schematic diagram
Figure 1. STEVAL-ISA093V1 circuit schematic
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2/4 |
Doc ID 022618 Rev 1 |
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