MxL7213 13A Dual Phase EVB User Manual
Test Interfaces
10/15/20
000UMR05
9
Test Interfaces
Load Transient Circuit
A load transient circuit is provided to allow optional testing of load transients. The IOSTEP clock input is used to drive the
transient signal. The load step generated by the FET (Q1) is very fast; the step slew rate is >40A/µs for a 6.5A transient
load test case.
To measure load transient response for either channel, use the circuit shown in
. To test CH1, populate R56 and
depopulate R57 and apply a small duty cycle pulse signal to IOSTEP CLK input (~ 1%). Adjust the amplitude of the IOSTEP CLK
pulse to set the load current. Start at a pulse amplitude of 2V and increase while monitoring the IOSTEP (J59) voltage. The
load current at IOSTEP (J59) is 10mV/A. For an example, a 6.5A load will occur when a 65mV pulse is observed at J59.
To test load transient response on CH2, depopulate R56 and populate R57 and repeat procedure.
Figure 4:
Load Transient Circuit
LOAD TRANSIENT CIRCUIT
VOUT1
(1,2)
VOUT2 (1,2)
R56
0 Ohm
J60
1
0603
R60
10 Kohm
0603
C39
1uF
R57
DNP
2512
R58
0.01 ohm
0603
C41
1uF
J61
1
0603
C40
1uF
Q1
SUD50N04
3
1
2
J58
1
2
J59
1
2
0603
C38
1uF
2512
R59
DNP
IOSTEP
IOSTEP_CLK
