ISL97672AIRZ Intersil, ISL97672AIRZ Datasheet - Page 12

• Manufacturer Part Number: ISL97672AIRZ
• Description: 6-Ch LED Driver With PWM Dimming. Vsc 7.5V Min
• Manufacturer: Intersil
• Series: -r

Specifications of ISL97672AIRZ

• Constant Current: -
• Constant Voltage: -
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: -
• Frequency: 200kHz ~ 1.5MHz
• Voltage - Supply: 4.5 V ~ 26.5 V
• Voltage - Output: 45V
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CASE
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
FAILURE MODE
VIN
IMAX
DRIVER
FAULT FLAG
ILIMIT
Upper
Over-Temperature
Protection limit (OTP)
not triggered, and
CH0 < 7.5V
Upper OTP triggered,
but VCH0 < 7.5V
Upper OTP not
triggered, but
CH0 > 7.5V
Upper OTP not
triggered, and
CH0 < 7.5V
Upper OTP not
triggered, and
CH0 < 7.5V
12
DETECTION MODE
FAULT
LOGIC
GENERATOR
DETECT
FIGURE 22. SIMPLIFIED FAULT PROTECTIONS
FAULT
LOGIC
PWM
CH0 ON and burns power.
All channels go off until chip cools,
and then come back on with current
reduced to 76%. Subsequent OTP
triggers further reduce I
CH1 disabled after six PWM cycle
time-outs.
V
after six PWM cycles and switches
off. V
CH1 remains ON and has highest VF;
thus, V
OUT
DRIVER
SHORT
THRM
THRM
SHDN
SHDN
FET
O/P
OTP
OTP
TABLE 1. PROTECTIONS TABLE
ramps to OVP. CH1 times out
OUT
FAILED CHANNEL ACTION
OUT
PWM/OC0/SC0
ISL97672A
drops to normal level.
increases.
VSET
LX
VSC
VSC
LX
OUT
OVP
.
T2
T1
SENSOR
TEMP
REF
CH1 through CH5 Normal
Same as CH0
CH1 through CH5 Normal
CH1 through CH5 Normal
CH1 through CH5 ON, Q1 through
Q5 burn power
VOUT
Q0
GOOD CHANNEL ACTION
PWM/OC5/SC5
CH0
VSET
Highest VF of CH1
Highest VF of CH1
Highest VF of CH1
Highest VF of CH1
through CH5
through CH5
through CH5
through CH5
VF of CH0
Q5
REGULATED BY
CH5
V
OUT
May 2, 2011
FN7710.2