SSL3401HN Datasheet, PDF (19/29 Pages) NXP Semiconductors – Low voltage dimmable controller for LED lighting

NXP Semiconductors
SSL3401HN
Low voltage dimmable controller for LED lighting
11. Dynamic characteristics
11.1 Power supply fluctuations
If the input voltage (V_DD(3V3)) to the internal regulator fluctuates, the SSL3401HN is held in
reset during a brownout condition as long as the UVLO circuit is operating. The settling
times of the BOD and POR circuits, which constitute the UVLO, determine the minimum
time the supply level must remain in the shallow or deep brownout condition to ensure that
the internal reset is asserted properly.
Table 8. UVLO circuits settling characteristics
Symbol Parameter Conditions
t_s
settling time power drop:
from active level to shallow
brownout level;
(0.9 V  V_DD(3V3)  2.4 V)
from active level to deep brownout
level (0 < V_DD(3V3) < 0.9 V)
Min Typ Max Unit
5
- - s
12
- - s
supply
voltage
V_DD(3V3)
cold
start-up
2.4 V
0.9 V
0V
brown-out
shallow
> 5 μs
brown-out
deep
> 12 μs
Fig 9. UVLO timing
11.2 I/O pins
Table 9. Dynamic characteristic: digital I/O pins^[1]
T_amb = 25C; 3.0 V  V_DD(IO)  3.6 V; load capacitor = 30 pF.
Symbol
Parameter
Conditions
Min
t_r
rise time
2.5
t_f
fall time
2.0
[1] Simulated results.
External
power supply
BOD trip point
(typical)
POR trip point
(typical)
time
internal reset
002aah326
Typ
Max
Unit
-
5.0
ns
-
4.5
ns
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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