MAX5069A Maxim Integrated, MAX5069A Datasheet - Page 5

• Manufacturer Part Number: MAX5069A
• Description: MAX5069A Evaluation Kit
• Manufacturer: Maxim Integrated

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