Datasheet

Test Setup
2-3
EVM Adjustments and Test Points
Table 2–3.Timing Equations
Timing Equations With Diode DH1
for Low Duty Cycles
Timing Equations Without Diode
RH 1
t
on
0.693 C
RH 1
t
on
(
2 D– 1
)
0.693
D C
RH 2
t
on
(
1 –D
)
0.693
D C
RH 2
t
on
(
1 –D
)
0.693
D C
Note: t
on
= desired load on-time [s]
D = on-time duty cycle
C = total capacitance in circuit (CH1 or CH1 + CH2) [F]
RH1, RH2 = Timer resistors value (refer to schematics) [Ω]
Figure 2–1. Location of Adjustment Parts
Input voltage transient impact
Input voltage transient impact
2.5 Test Setup
Figure 2–2 shows the test setup. Follow these steps for initial power up of the
SLVP125
1) Populate the test devices on the board (U1 and U2) and adjust the settings
of jumpers, switches, and trimmers to fit test requirements. Also make
sure that the minimum/maximum load resistors are populated and
matched to the output current of the LDO you want to test, and that they
can handle the power dissipation.
2) Connect a 12-V lab power supply to the 12-V input J2. The polarity is
printed on the board. A current limit of 200 mA should be adequate for the
test and measure circuit.