ST ISA084V1 User Manual
STEVAL-ISA084V1
4 A peak, 800 kHz fixed-frequency PWM synchronous step-down demonstration board with enable on/off based on the ST1S40
Features
■Vin: 4 V to 18 V
■Vout: 3.3 V
■Maximum output current: 4 A
■Switching frequency: 800 kHz
■Short-circuit: protected
■RoHS compliant
Description
The STEVAL-ISA084V1, based on the ST1S40, is an internally compensated 800 kHz fixedfrequency PWM synchronous step-down converter demonstration board.
The ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN (100% duty-cycle).
The ST1S40 integrates 95 mΩhigh side switch and 69 mΩsynchronous rectifier allowing very high efficiency with very low output voltages.
The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.
The device is protected through cycle-by-cycle current limiting in case of overload and is also protected by current foldback function with frequency reduction in case of short-circuit
The device is available with an enable on/off function.
Data brief
STEVAL-ISA084V1
November 2011 |
Doc ID 022542 Rev 1 |
1/4 |
For further information contact your local STMicroelectronics sales office. |
www.st.com |
|
Circuit schematic |
STEVAL-ISA084V1 |
|
|
1 Circuit schematic
Figure 1. Circuit schematic
6). 6 |
|
, ( |
6/54 6 |
|
|
||
6).! |
|
|
|
#IN?A |
34 3 |
2 |
|
%. 0' |
|
||
|
|
||
n & |
|
|
|
#IN?SW |
|
|
#OUT |
|
2 |
|
|
0'.$ !'.$ |
& |
||
& |
|
|
|
2/4 |
Doc ID 022542 Rev 1 |
Loading...