Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX16831 User Manual
Page 5
MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
_______________________________________________________________________________________
5
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
THERMAL SHUTDOWN
Thermal Shutdown Temperature
T
SHDN
Temperature rising
+165
°C
Hysteresis
∆T
SHDN
20
°C
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
UVEN
= 14V, C
REG1
= 1µF, C
REG2
= 1µF, C
CLMP
= 0.1µF, R
T
= 25kΩ, T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical specifications are at T
A
= +25°C.)
Note 1: Dropout voltage is defined as the input to output differential voltage at which the regulator output voltage drops 100mV below
the nominal output voltage.
Note 2: V
CLMPTH
determines the voltage required to operate the current-sense amplifier. The DIM driver requires 2.5V for (V
CLMP
- V
LO
)
to drive the external MOSFET. V
HI
is typically one diode drop above V
CLMP
. A large capacitor connected to V
CLMP
slows the
response of the LED current-sense circuitry, resulting in current overshoot. To ensure proper operation, connect a 0.1µF
capacitor from CLMP to LO.
Typical Operating Characteristics
(V
CC
= V
UVEN
= 14V, C
REG1
= 1µF, C
REG2
= 10µF, C
CLMP
= 0.1µF, R
T
= 25kΩ, R
CS
= 0.1Ω, T
A
= +25°C, unless otherwise noted.)
18
20
19
22
21
24
23
25
27
26
28
-60
-20
0
20
-40
40 60 80
120
100
140
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX16831 toc01
TEMPERATURE (
°C)
SHUTDOWN CURRENT (
µ
A)
2.0
2.2
2.1
2.4
2.3
2.6
2.5
2.7
2.9
2.8
3.0
-60
-20
0
20
-40
40 60 80
120
100
140
OPERATING CURRENT
vs. TEMPERATURE
MAX16831 toc02
TEMPERATURE (
°C)
OPERATING CURRENT (mA)
DGT AND DRV NOT
SWITCHING
40
30
20
10
0
70
60
50
80
90
110
100
120
0
10
20
30
40
VOLTAGE ACROSS LED CURRENT-SENSE
RESISTOR vs. SUPPLY VOLTAGE
MAX16831 toc03
SUPPLY VOLTAGE (V)
VOLTAGE ACROSS R
CS
(mV)