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MAX17497A

AC-DC and DC-DC Peak Current-Mode Converters with Integrated Step-Down Regulator

Maxim Integrated 

MAX17497A/MAX17497B

AC-DC and DC-DC Peak Current-Mode Converters

with Integrated Step-Down Regulator

Pin Configuration

TOP VIEW

12 11 10 9

RESETN 13

PGNDF 14

LXF 15

MAX17497A

MAX17497B

IN 16

EP

+

1

2

3

4

8 SSF

7 COMPF

6 EAFN

5 SCOMPF

TQFN

Pin Description

PIN

NAME

FUNCTION

Enable/Undervoltage-Lockout Pin. Drive to > 1.23V to start the devices. To externally program the

1

EN/UVLO UVLO threshold of the input supply, connect a resistor-divider between input supply EN/UVLO and

SGND.

2

VCC

Linear Regulator Output. Connect input bypass capacitor of at least 1FF from VCC to SGND as close

as possible to the IC.

3

OVI

Overvoltage Comparator Input. Connect a resistor-divider between the input supply (OVI) and SGND

to set the input overvoltage threshold.

4

RLIMF

Current-Limit Setting Pin. Connect a resistor between RLIMF and SGND to set the peak-current limit

for nonisolated flyback converter. Peak-current limit defaults to 500mA if unconnected.

Slope Compensation Input Pin. Connect a resistor between SCOMPF and SGND to set slope comp

5

SCOMPF ramp. Connect to VCC for minimum slope comp. See the Programming the Slope Compensation for

the Flyback/Boost Converter (SCOMPF) section.

Feedback/Inverting Input of the Error Amplifier for Nonisolated Flyback Converter. Connect to

6

EAFN

midpoint of resistor-divider from the positive terminal of the output capacitor of the flyback/boost

converter to SGND.

7

COMPF

Error-Amplifier Output of Flyback/Boost Converter. Connect the frequency-compensation network

between COMPF and SGND. See Figure 9.

Maxim Integrated

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