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ABSOLUTE MAXIMUM RATINGS
These are stress ratings only, and functional operation of the
device at these ratings or any other above those indicated in
the operation sections of the specifications below is not
implied. Exposure to absolute maximum rating conditions for
extended periods of time may affect reliability.
Input Voltage….................................................-0.3V to 30V
Lx………………………………………………….…-2V to 30V
FB……………..................................................-0.3V to 5.5V
Storage Temperature..…………….…..……-65 ° C to 150 ° C
Junction Temperature...................................-40 ° C to 125 ° C
Lead Temperature (Soldering, 10 sec)….….………..300 ° C
ESD Rating………...……1kV LX, 2kV all other nodes, HBM
ELECTRICAL SPECIFICATIONS
Specifications are for T AMB =T J =25 ° C, and those denoted by ? apply over the full operating range, -40 ° C< T j <125 ° C. Unless
otherwise specified: V IN = 4.5V to 29V, C IN = 4.7 μ F.
PARAMETER
UVLO Turn-On Threshold
UVLO Turn-Off Threshold
MIN
4.0
3.8
TYP
4.2
4.0
MAX
4.5
4.3
UNITS
V
V
?
CONDITIONS
0 ° C to 125 ° C
0 ° C to 125 ° C
UVLO Hysteresis
0.2
V
Operating Input Voltage
Range
Operating Input Voltage
Range
Operating VCC Current
Standby VCC Current
Reference Voltage
Reference Voltage
4.5
7
0.186
2
0.6
0.2
29
29
3
1
0.214
V
V
mA
mA
V
V
?
?
0 ° C to 125 ° C
VFB=0.1V, gate not switching
VFB=1.2V, gate not switching
Switching Frequency
Peak-to-peak ramp Voltage
960
1200
Vin/10
1440
kHz
V
Ramp clamped to <= 4.2V
Minimum ON-Pulse Duration
40
100
ns
?
Minimum Duty Cycle
Maximum Duty Cycle
100
0
%
%
Gate Driver Turn-Off
Resistance
Gate Driver Pull-Down
Resistance
Gate Driver Pull-up
Resistance
50
4
3
60
8
6
k ?
?
?
Internal resistor between GATE
and VIN
V IN =12V, V FB =0.1V, Measure
resistance between GATE and
VDR
V IN =12V, V FB =0.3V, Measure
resistance between GATE and VIN
VIN - VDR voltage difference
4.5
5.5
V
?
Measure VIN – VDR, VIN>7V
Overcurrent Threshold
LX pin Input Current
300
25
350
33
400
40
mV
μ A
Measure VIN - LX
V LX = VIN
OFF interval during hiccup
50
ms
SHDN Threshold
0.8
1.0
1.2
V
?
Apply voltage to FB
SHDN Threshold Hysteresis
100
mV
Sept25-07 Rev D
SP7601 29V High Voltage LED Driver
Page 2
? 2007 Exar Corporation
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