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MAX5037 Evaluation Kit
INPUT STARTUP RESPONSE
V PGOOD
2V/div
V OUT
500mV/div
Turn On
The MAX5037 offers inherent soft-start at turn-on
through its current-error amplifier compensation capac-
itors. The output rises monotonically without overshoot.
The output voltage reaches its specified range within
10ms of the input power reaching its operating voltage
range at full load. See Figures 12, 13, and 14.
Current Limiting
The average current-mode control technique of the
MAX5037 limits the maximum output current per phase
2ms/div
Figure 12. Input Startup Response
V IN = +12V
V OUT = +1.75V
I OUT = 0A
V IN
10V/div
accurately. The MAX5037 senses and limits the peak
inductor current (I L-PK ) across the sense resistor. Two
channels limit the current. The regular channel termi-
nates the ON cycle when the current-sense voltage
reaches 48mV (typ). The faster channel, with only
260ns delay, terminates the ON cycle when the voltage
across the sense resistor reaches 112mV during output
short-circuit and inductor saturation. Use the following
I OUT = ?
? × N
INPUT STARTUP RESPONSE
V IN = +12V
V OUT = +1.75V
I OUT = 52A
2ms/div
Figure 13. Input Startup Response
ENABLE STARTUP RESPONSE
V PGOOD
1V/div
V OUT
1V/div
V IN
5V/div
V PGOOD
1V/div
V OUT
1V/div
V IN
equation to calculate the current limit:
? 0 . 05 ?
? R 1 // R 2 ?
For the EV kit, current limit occurs at 63A typically with
R SENSE equal to 1.6m ? . In case of a short circuit at the
output, the average output current is maintained at its
current-limit value.
External Synchronization with
CLKIN and CLKOUT
Multiple MAX5037 EV kits can be paralleled to increase
output current capacity. The EV kit is provided with the
CLKIN input (JP4) and CLKOUT (JP5) output for easy
paralleling. The CLKOUT is phase delayed from CLKIN
or DH1 by an amount set by PHASE (JP3). A jumper
between pins 1 and 2 set the phase delay to 60 ° , a
jumper between pins 2 and 3 set the delay to 120 ° , and
the OPEN jumper sets the phase delay to 90 ° . Figures
15, 16, and 17 show the CLKOUT position with respect
to CLKIN and DH1 for 60 ° , 90 ° , and 120 ° , respectively.
V IN = +12V
V OUT = +1.75V
I OUT = 52A
1ms/div
Figure 14. Enable Startup Response
2V/div
_______________________________________________________________________________________
9
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相关代理商/技术参数
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