ISL97683IRTZ-TK Intersil, ISL97683IRTZ-TK Datasheet - Page 14

• Manufacturer Part Number: ISL97683IRTZ-TK
• Description: 3 Channel LED Driver, 16LD TQFN 3X3, T&R
• Manufacturer: Intersil
• Series: -r

Specifications of ISL97683IRTZ-TK

• Constant Current: -
• Constant Voltage: -
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 3
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: -
• Frequency: 500kHz ~ 650kHz, 900kHz ~ 1.1MHz
• Voltage - Supply: 4 V ~ 26.5 V
• Voltage - Output: 45V
• Mounting Type: Surface Mount
• Package / Case: 16-WFQFN Exposed Pad
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CASE
1
2
3
4
5
6
7
8
9
CH1 Short Circuit
CH1 Short Circuit
CH1 Short Circuit
CH1 Open Circuit
with infinite
resistance
CH1 LED Open
Circuit but has
paralleled Zener
CH1 LED Open
Circuit but has
paralleled Zener
CH1 LED Open
Circuit but has
paralleled Zener
Channel-to-Channel
ΔVF too high
Output LED stack
voltage too high
FAILURE MODE
VIN
REG
VIN
VSET/2
IMAX
Protection limit (OTP) not
triggered and CH1 < 4.4V
OTP triggered but VCH1 <
4.4V
OTP not triggered but
CH1 > 4.4V
OTP not triggered and
CH1 < 4.4V
OTP not triggered and
CH1 < 4.4V
OTP triggered but CH1 <
4.4V
OTP not triggered but
CHx > 4.4V
OTP triggered but CHx <
4.4V
V
Over-Temperature
14
OUT
I
LIMIT
DETECTION MODE
> V
OVP
ISL97682, ISL97683, ISL97684
LOGIC
FIGURE 25. SIMPLIFIED FAULT PROTECTIONS
PHASE SHIFT
AND LOGIC
CONTROL
SHORT
DRIVER
TABLE 3. PROTECTIONS TABLE
CH1 ON and burns power
All channels switched off until power-cycled.
CH1 faults out after 6 PWM cycle
(7-18 in direct PWM) time-out
V
time-out after 6 PWM cycles (7-18
in direct PWM) and switch off. V
will drop to normal level.
CH1 remains ON and has highest
VF, thus V
CH1 goes off
CH1 remains ON and has highest
VF, thus V
All channels switched off until chip cooled
Driven with normal current. Any channel that has insufficient headroom
will fault out after 6 PWM cycle (7-18 in direct PWM) time-out.
FET
O/P
OUT
THRM
SHDN
FAILED CHANNEL ACTION
will ramp to OVP. CH1 will
OTP
OUT
OUT
VSET
PWM1/OC1/SC1
increases
increases.
LX
VSC
+
-
OVP
T2
T1
SENSOR
TEMP
REF
OUT
VOUT
Q1 VSET
CH2 through CH4 Normal
CH2 through CH4 Normal
CH2 through CH4 Normal
CH2 through CH4 ON, Q2 through
Q4 burn power
Same as CH1
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
PWM4/OC4/SC4
GOOD CHANNELS ACTION
increases then CH-X
+
-
Q4
CH4
Highest VF of CH2
through CH4
Highest VF of CH2
through CH4
Highest VF of CH2
through CH4
Highest VF of CH2
through CH4
VF of CH1
VF of CH1
VF of CH1
Highest VF of CH1
through CH4
Highest VF of CH1
through CH4
V
OUT
March 11, 2011
REGULATED
BY
FN7689.0