SC5010 Datasheet, PDF (20/36 Pages) Semtech Corporation – High Effi ciency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming

SC5010
Applications Information (continued)
lator to the SYNC input. Figures on page 11 show
synchronization of SC5010 to a 48kHz HSYNC signal
applied on SYNC pin. The turn-on of the LED string IO1
(falling edge of V ) is synchronized to the rising edge of
IO1
the HSYNC input. The turn-on of rest of the strings will be
delayed based on the phase shifting algorithm. Another
figure shows the delay (~500ns) between HSYNC rising
edge and turn-on of the LED string 1 (IO1).
Input Disconnect
The SC5010 incorporates a high voltage (up to 27V) p-
MOSFET gate driver which can be used for controlling an
Table 2 — Fault Protection Descriptions
Type of
Fault
User
Disable?
Fault Criteria
Input
No
Under-voltage
V < 1 + R /R )
IN
21
x 1.23 (rising)
at VIN
(UVLO)
V < (1 + R /R ) × 1.23V - I
No
IN
21
UVLO
× R (falling)
1
Input
No
Under-volage
at VCC
(UVLO)
No
VCC < 4.2V
(rising)
VCC < 4.0V
(falling)
Action on Fault
Device
FLT pin (latching
/ non-latching
No Startup
Not Active
Shutdown
Not active
No Startup
Not active
Shutdown
Not active
Recovery
Condition(s)
V > 1.23V
UVLO
(rising)
V > 1.23V
UVLO
(rising)
VCC > 4.2V
(rising)
VCC > 4.2V
(rising)
FLT pin
High
High
High
High
Over-voltage
Protection
No
(OVP)
Over-current
Protection
No
(OCP)
V > 1.2V
OVP
(rising)
V > 0.4V
CS
Regulate to OVP
threshold:
I = “on”
O(n)
Limit Q1 FET drain
current < 0.4V/R3
(typ)
Low
(non-latching)
High
V > 1.2V
OVP
(falling)
High on re-
moval of fault
condition
V > 0.4V
CS
High
Shorted
LED(s)
Yes, tie
SCP to
VCC
Open
LED(s)
No
Over-Tempera-
ture Protection No
(OTP)
V > 20 x V
IO(n)
SCP
V > 20 x V
IO(All)
SCP
V < 0.1V
IO(n)
and OVP event
V < 0.1V
IO(All)
and OVP event
TJ > 150ºC (typ)
Device on:
I = “off”
O(n)
Other I = “on”
O(All)
Device latch-off;
I_O(All) = “off ”
Device on:
I = “off”
O(n)
Other I = “on”
O(All)
Device latch-off;
I = “off”
O(All)
Device off;
I = “off”
O(All)
Low
(latching)
Low
(latching)
Low
(latching)
Low
(latching)
Low
(latching)
Replace shorted
LED(s) and Toggle
EN, VCC or UVLO
Replace shorted
LED(s) and Toggle
EN, VCC or UVLO
Replace open
LED(s) and Toggle
EN, VCC or UVLO
Replace open
LED(s) and Toggle
EN, VCC or UVLO
Satisfy T > 10ºC;
HYS
Device on;
I = “on”;
O(All)
Toggle EN, VCC or
UVLO
High
High
High
High
High
Note: Refer to the application circuit example on page 21.
20