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

with Integrated Step-Down Regulator

MAX17497A/MAX17497B

 Maxim Integrated Products 10

Pin Description

Pin Configuration

PIN

NAME

FUNCTION

1

EN/UVLO

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

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

SGND.

2

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.

5

SCOMPF

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

the Flyback/Boost Converter (SCOMPF) section.

6

EAFN

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

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.

15

16

14

13

6

5

7

8

12

PGNDF

4

12

11

9

LXF

EP

IN

SSF

COMPF

EAFN

SCOMPF

+

3

10

RESETN

TQFN

TOP VIEW

MAX17497A

MAX17497B