SSL3401HN datasheet(6/29 Pages) PHILIPS

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SSL3401HN

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Product data sheet

Rev. 2 — 28 January 2014

6 of 29

NXP Semiconductors

SSL3401HN

Low voltage dimmable controller for LED lighting

Functional description

8.1 Supply

The SSL3401HN operates with a 3.3 V typical supply. The IC core and the interface pins

are supplied by two different supply pins VDD and VDD(IO). These pins are not connected

internally in the IC. They must all be connected externally to the main supply.

8.2 State diagram

The SSL3401HN has two modes:

• Reset

• Active

8.2.1 Reset mode

The chip enters the reset state:

• At the power start-up phase

• When VDD drops below the VDD POR threshold voltage (Vth(POR))

• When the RESET pin is set LOW

All registers are cleared to their default values.

LEDPWM

output

LED current control (input pin at reset)

DNC

supply

do not connect

ACMPN

input

analog comparator negative input

ACMPREF

output

analog comparator reference voltage

DNC

do not connect

OVP

input

overvoltage protection sensing input

DNC

do not connect

PARAMSET

input

input latching current and OTP setting input

DNC

do not connect

DNC

do not connect

DNC

do not connect

input

feedback loop input voltage

DNC

do not connect

LEDSDWN

output

LED current deep dimming control

VDD

power

3.3 V supply voltage

BSTDRVA

output

power MOSFET driver output

BSTDRVB

output

power MOSFET driver output

ACMPP

input

analog comparator positive input

VSS

ground

die pad ground terminal

Table 3.

Pin description …continued

Symbol

Type

Reset

state

Description

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