ISL97675IRZ-TK Intersil, ISL97675IRZ-TK Datasheet - Page 16

• Manufacturer Part Number: ISL97675IRZ-TK
• Description: IC LED DVR PWM CTRL 4CH 20QFN
• Manufacturer: Intersil
• Type: Backlight, White LEDr

Specifications of ISL97675IRZ-TK

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 600kHz, 1.2MHz
• Voltage - Supply: 4.5 V ~ 26 V
• Voltage - Output: 45V
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Efficiency: 92%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL97675IRZ-TKTR

channels having large voltages across them) to hit the
upper temperature threshold.
The upper threshold is set to +150°C. Each time this is
reached, the boost will stop switching and the output
current sources will be switched off.
CASE
1
2
3
4
FB1 Short Circuit
FB1 Short Circuit
FB1 Short Circuit
FB1 Open Circuit
with infinite
resistance
FAILURE MODE
V
IN
REG
V
SET
V
I
MAX
/2
IN
DRIVER
16
Upper Over-Temperature
Protection limit (OTP) not
triggered and FB1 < 4V
Upper OTP triggered but
VFB1 < 4V
Upper OTP not triggered
but FB1 > 4V
Upper OTP not triggered
and FB1 < 4V
I
DETECTION MODE
LIMIT
FAULT
FIGURE 24. SIMPLIFIED FAULT PROTECTIONS
LOGIC
PHASE SHIFT &
CONTROL
LOGIC
TABLE 3. PROTECTIONS TABLE
DRIVER
SHORT
O/P
FET
THRM
THRM
SHDN
SHDN
OTP
OTP
FAILED CHANNEL ACTION
FB1 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
further.
FB1 disabled after 6 PWM
cycle timeout.
V
will time-out after 6 PWM
cycles and switch off. V
will drop to normal level.
PWM1/OC1/SC1
ISL97675
OUT
V
SET
will ramp to OVP. FB1
LX
VSC
VSC
For the extensive fault protection conditions, please refer
to Figure 24 and Table 3 for details.
+
-
OVP
T2
T1
SENSOR
TEMP
REF
OUT
OUT
V
Q1
OUT
PWM4/OC4/SC4
FB1
V
SET
FB2 through FB4
Normal
Same as FB1
FB2 through FB4
Normal
FB2 through FB4
Normal
GOOD CHANNELS
+
-
ACTION
Q4
FB4
Highest VF of
FB2 through FB4
Highest VF of
FB2 through FB4
Highest VF of
FB2 through FB4
Highest VF of
FB2 through FB4
REGULATED
V
May 19, 2010
BY
OUT
FN7630.0