ISL97672IRZ Intersil, ISL97672IRZ Datasheet - Page 13

• Manufacturer Part Number: ISL97672IRZ
• Description: IC LED DVR PWM CTRL 6CH 20QFN
• Manufacturer: Intersil

Specifications of ISL97672IRZ

• Constant Current: *
• Constant Voltage: *
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Automotive, Backlight
• Frequency: 200kHz ~ 1.5MHz
• Voltage - Supply: 4.5 V ~ 26.5 V
• Voltage - Output: *
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 40mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CASE FAILURE MODE
10
11
6
7
8
9
CH0 LED Open
Circuit but has
paralleled Zener
CH0 LED Open
Circuit but has
paralleled Zener
Channel-to-
Channel
ΔVF too high
Channel-to-
Channel ΔVF too
high
Output LED stack
voltage too high
V
to GND at start-up
or V
operation
OUT
OUT
/LX shorted
shorted in
Upper OTP
triggered but CH0
< 4V
Upper OTP not
triggered but CHx
> 4V
Lower OTP
triggered but CHx
< 4V
Upper OTP
triggered but CHx
< 4V
V
LX current and
timing are
monitored.
OVP pins
monitored for
excursions below
20% of OVP
threshold.
OUT
13
DETECTION
> VOVP
MODE
TABLE 1. PROTECTIONS TABLE (Continued)
All channels go off until chip
cooled and then comes back on
with current reduced to 76%.
Subsequent OTP triggers will
reduce I
CH0 remains ON and has
highest VF, thus V
Any channel at below the target current will fault out after 6 PWM
cycles.
Remaining channels driven with normal current.
All channels go off until chip cooled and then comes back on with
current reduced to 76%. Subsequent OTP triggers will reduce
I
Any channel that is below the target current will time-out after 6
PWM cycles, and V
voltage required for other channels.
The chip is permanently shutdown 31mS after power-up if
V
OUT
OUT
FAILED CHANNEL ACTION
/Lx is shorted to GND.
further
OUT
ISL97672
further
OUT
OUT
increases.
will return to the normal regulation
Same as CH0
V
switches OFF after 6 PWM
cycles. This is an unwanted
shut off and can be prevented
by setting OVP at an
appropriate level.
OUT
GOOD CHANNELS ACTION
increases, then CH-X
REGULATED BY
VF of CH0
VF of CH0
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
Highest VF of
CH0 through
CH5
November 1, 2010
V
OUT
FN7632.1