Connectors And Test Points; Vin - Fs1; Gnd - Fs2; Vout - Fs4 - STMicroelectronics STEVAL-L3751V12 User Manual

3

Connectors and test points

3.1 V - FS1
IN
This is the V
IN
V after an EMI filter (see
IN
The supply voltage should be set with a current limitation compatible with the power board request. Typically:
V should be connected to the power source with a short wire to avoid oscillations between the cable parasitic
IN
inductance and the input ceramic capacitor.
3.2

GND - FS2

This is the return of the terminal of the input and output capacitors. We suggest using a short wire to avoid
oscillations between the cable parasitic inductance and the input capacitor.
3.3 V - FS4
OUT
This is the V
OUT
point. We suggest using short wires for the connection.
3.4

Signal manager - J5

• Pin 1–VCC: output pin. You can monitor the V
• Pin 2–SYNCIN: input pin. You can change the switching frequency through an external waveform generator.
You can set the frequency between 50% F
• Pin 3–AGND: signal GND.
• Pin 4–SYNCOUT: output pin. A rectangular waveform is generated from this pin. It implements a 180° phase
shifted referred to the HO driving signal. It can be useful for synchronization with others power system
(check the
• Pin 5 - PGOOD: output signal. It is an open collector. It is short to GND once V
windows (±8%). Otherwise, it is short to the external pull-up voltage. In the STEVAL-L3751V12, it is pulled
up to the V
• Pin 6–TRIM: connect to GND ( short to pin 7 through a jumper) to select V
select V
OUT2
• Pin 7–AGND: signal GND. Used to short pin6 to GND and changeV
• Pin 8 - SS/TRK: output pin. You can monitor the soft start ramp. The pin voltage is clamped at 115 mV over
the FB voltage (see the
• Pin 9–EN/Uvlo: input signal. You can turn on and off the system with an external signal (see the
datasheet for further details). By default, it is connected to a partition of V
V >14.5 V.
IN
• Pin 10 - AGND: signal GND.
UM3024 - Rev 1
connector. To use it, connect the supply voltage from 6 to 75 V. This voltage becomes the device
Section 4 for further details).
connector and test point. Connect the active load or power resistor between V
L3751 datasheet for further details).
pin.
CC
. In the STEVAL-L3751V12, V
L3751 datasheet for further details).
I lim > V OUT /V IN × I OUT
pin voltage (driver supply voltage).
CC
and 120% F .
SW SW
is set to 12.18 V and V
OUT1
OUT
UM3024
Connectors and test points
and GND test
OUT
is out of the regulator
OUT
. Leave the pin floating to
OUT1
is set to 5.07 V.
OUT2
. See pin 6 description.
L3751
. The system turns on once
IN
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