SSL3401HN Datasheet, PDF (6/29 Pages) NXP Semiconductors – Low voltage dimmable controller for LED lighting

NXP Semiconductors
SSL3401HN
Low voltage dimmable controller for LED lighting
Table 3. Pin description …continued
Symbol
Pin Type
LEDPWM
DNC
ACMPN
ACMPREF
DNC
OVP
DNC
PARAMSET
DNC
DNC
DNC
FB
DNC
LEDSDWN
V_DD
BSTDRVA
BSTDRVB
ACMPP
V_SS
15 output
16 supply
17 input
18 output
19 -
20 input
21 -
22 input
23 -
24 -
25 -
26 input
27 -
28 output
29 power
30 output
31 output
32 input
33 ground
Reset
state
H
-
-
H
-
-
-
-
-
-
-
-
-
H
-
H
H
-
-
Description
LED current control (input pin at reset)
do not connect
analog comparator negative input
analog comparator reference voltage
do not connect
overvoltage protection sensing input
do not connect
input latching current and OTP setting input
do not connect
do not connect
do not connect
feedback loop input voltage
do not connect
LED current deep dimming control
3.3 V supply voltage
power MOSFET driver output
power MOSFET driver output
analog comparator positive input
die pad ground terminal
8. 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 V_DD and V_DD(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 V_DD drops below the V_DD POR threshold voltage (V_th(POR))
• When the RESET pin is set LOW
All registers are cleared to their default values.
SSL3401HN
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 28 January 2014
© NXP B.V. 2014. All rights reserved.
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