ISL97672IRZ Intersil, ISL97672IRZ Datasheet - Page 12

• 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
1
2
3
4
5
/FLAG
CH0 Short Circuit
CH0 Short Circuit
CH0 Short Circuit
CH0 Open Circuit
with infinite
resistance
CH0 LED Open
Circuit but has
paralleled Zener
VIN
IMAX
DRIVER
FAULT FLAG
ILIMIT
Upper
Over-Temperature
Protection limit
(OTP) not triggered
and CH0 < 4V
Upper OTP
triggered but VCH0
< 4V
Upper OTP not
triggered but CH0
> 4V
Upper OTP not
triggered and CH0
< 4V
Upper OTP not
triggered and CH0
< 4V
12
DETECTION
FAULT
MODE
LOGIC
FIGURE 20. SIMPLIFIED FAULT PROTECTIONS
GENERATOR
DETECT
FAULT
LOGIC
PWM
CH0 ON and burns power.
All channels go off until chip
cooled and then comes back on
with current reduced to 76%.
Subsequent OTP triggers will
reduce I
CH1 disabled after 6 PWM cycle
time-out.
V
time-out after 6 PWM cycles and
switch off. V
normal level.
CH1 remains ON and has
highest VF, thus V
TABLE 1. PROTECTIONS TABLE
OUT
FAILED CHANNEL ACTION
DRIVER
SHORT
THRM
THRM
SHDN
SHDN
FET
O/P
OTP
OTP
will ramp to OVP. CH1 will
PWM/OC0/SC0
OUT
ISL97672
VSET
OUT
further.
will drop to
LX
VSC
VSC
OUT
LX
increases.
OVP
T2
T1
SENSOR
TEMP
REF
Same as CH0
CH1 through CH5 Normal
CH1 through CH5 Normal
CH1 through CH5 ON, Q1
through Q5 burn power
CH1 through CH5 Normal
GOOD CHANNELS ACTION
VOUT
Q0
PWM/OC5/SC5
CH0
VSET
REGULATED BY
Highest VF of
CH1 through
CH5
Highest VF of
CH1 through
CH5
Highest VF of
CH1 through
CH5
Highest VF of
CH1 through
CH5
VF of CH0
Q5
November 1, 2010
CH5
V
OUT
FN7632.1