MAX5069AEVKIT Maxim Integrated Products, MAX5069AEVKIT Datasheet - Page 5
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MAX5069AEVKIT
Manufacturer Part Number
MAX5069AEVKIT
Description
EVAL KIT FOR MAX5069A
Manufacturer
Maxim Integrated Products
Specifications of MAX5069AEVKIT
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Isolated
Voltage - Output
12V
Current - Output
10A
Voltage - Input
36 ~ 72V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
MAX5069A
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
where R
V
imum DC output current (10A or less). Note that some
fine-tuning may be required when selecting the current-
limit resistors. Errors are introduced as a result of the
MAX5069A IC current-limit propagation delays.
The MAX5069A EV kit features a brownout and input-
supply startup UVLO circuit that prevents operation
below the programmed input-supply start voltage.
Resistors R5 and R6 set the input undervoltage lockout
threshold of the EV kit. To evaluate other input UVLO
voltages, replace resistor R5 with another surface-mount
resistor (0805 size). Using the desired startup voltage,
resistor R5 is then found by the following equation:
where VIN
the EV kit starts and resistor R6 is typically in the 20kΩ
range. Refer to the MAX5069A/D UVLO Adjustment and
Bootstrap Undervoltage Lockout sections of the
MAX5069 data sheet for additional information on the
UVLO/EN pin of the MAX5069A IC.
SENSE
= 0.314V, N
CS
R
STARTUP
CS
R
= parallel combination of R14 and R15,
5
=
=
Input Undervoltage Lockout (UVLO)
_______________________________________________________________________________________
is the desired startup voltage at which
N
N
S
VIN
S
P
= 2, N
1 231
×
STARTUP
.
(
V
P
V
1 2
SENSE
.
= 5, and I
×
−
1
I
×
OUTMAX
OUTMAX
R
6
)
= max-
MAX5069A Evaluation Kit
Figure 1. MOSFETs N1 and N2 Drain-Source Voltage Waveforms
(50V per Division, 1µs per Division)
Push-Pull DC-DC Converter
1µs/div
0V
N2 DRAIN VOLTAGE
N1 DRAIN VOLTAGE
0V
5