MAX17497AEVKIT# Maxim Integrated, MAX17497AEVKIT# Datasheet - Page 4

• Manufacturer Part Number: MAX17497AEVKIT#
• Description: Power Management IC Development Tools MAX17497 Eval Kit
• Manufacturer: Maxim Integrated

Specifications of MAX17497AEVKIT#

• Rohs: yes

The IC features current limiting for the transformer’s
primary side by monitoring the peak current entering
the IC LXF input. Resistor R15 sets the EV kit circuit
current limit to 548mA. The IC turns off switching MOSFET
N1 when the peak current at the LXF pin reaches the
current limit.
To reconfigure the peak current limit to a different value,
use the following equation to choose a new R15 resistor:
where I
When the instantaneous peak current through the LXF pin
reaches a level 20% higher than the programmed peak
current limit, then the IC enters into hiccup mode, which
keeps the respective converters in shutdown mode and
retries after 32ms. This limits the average short-circuit
current equal to:
where t
duration.
Maxim Integrated
PEAK
HICCUP
I
SS
is in amps and R15 is in kI.
= I
is 32ms and t
PEAK
R15 = 50 x I
x t
SS
/(t
SS
SS
PEAK
is the short-circuit time
+ t
Current Limiting
HICCUP
)
The EV kit features UVLO and OVI circuit protection
that prevent operation below the programmed input
supply start voltage. Resistors R9–R12 set the under-
voltage-threshold level. Resistors R13 and R14 set the
overvoltage-threshold levels. The EV kit circuit under-
voltage and overvoltage are set to +78V and +422V,
respectively. To reconfigure the OVLO and UVLO, refer
to the Startup Voltage and Input Overvoltage-Protection
Setting (EN/UVLO, OVI) section in the MAX17497A/
MAX17497B IC data sheet.
The EV kit provides a PCB pad to monitor the status of the
open-drain output (RESTN). RESETN is high when VOUT
is within 5% of its regulated voltage. When VOUT falls
below 92% (typ) of its regulated voltage, RESETN is pulled
low. RESETN is pulled up to VCC through resistor R20.
Evaluates: MAX17497A
and Overvoltage (OVI) Lockout
Open-Drain Output (RESETN)
Undervoltage (UVLO)
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