Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX16822B User Manual
Page 3
MAX16822A/MAX16822B
2MHz, High-Brightness LED Drivers with
Integrated MOSFET and High-Side Current Sense
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INTERNAL MOSFET
V
IN
= V
DIM
= 24V, V
CS
= 23.9V,
I
LX
= 350mA
0.85
1.7
Drain-to-Source Resistance
R
DSON
V
IN
= V
DIM
= 6.0V, V
CS
= 5.9V,
I
LX
= 350mA
1
2
Ω
LX Leakage Current
I
LX_LEAK
V
DIM
= 0V, V
LX
= 65V
10
µA
DIM INPUT
DIM Input-Voltage High
V
IH
V
IN
- V
CS
= 100mV
2.8
V
DIM Input-Voltage Low
V
IL
V
CS
- V
IN
= 100mV
0.6
V
DIM Turn-On Time
t
DIM_ON
V
DIM
rising edge to V
LX
< 0.5V
IN
200
ns
DIM Input Leakage High
V
DIM
= V
IN
15
µA
DIM Input Leakage Low
V
DIM
= 0V
-3
0
µA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Temperature rising
165
o
C
Thermal-Shutdown Threshold
Hsysteresis
10
o
C
THERMAL FOLDBACK
Thermal-Foldback Enable
Threshold Voltage
V
TFBON_THR
V
DIM
= 5V
1.9
2.0
2.12
V
Thermal-Foldback Slope
FB
SLOPE
V
DIM
= 5V
0.75
1/V
TEMP_I Output Bias Current
I
TEMP_I
25
26.5
28
µA
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +24V, V
DIM
= V
IN
, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
EFFICIENCY
vs. V
IN
MAX16822A toc01
V
IN
(V)
EFFICIENCY (%)
55
45
35
25
15
75
80
85
90
95
100
70
5
65
1 LED
3 LEDs
5 LEDs
7 LEDs9 LEDs
11 LEDs13 LEDs 15 LEDs
9 LEDs
DUTY CYCLE
vs. V
IN
MAX16822A toc02
V
IN
(V)
DUTY CYCLE (%)
55
45
35
25
15
10
20
30
40
50
60
70
80
90
100
0
5
65
1 LED
3 LEDs
5 LEDs
7 LEDs
15 LEDs
11 LEDs
13 LEDs
FREQUENCY
vs. V
IN
MAX16822A toc03
V
IN
(V)
FREQUENCY (kHz)
55
45
35
25
15
10
20
30
40
50
60
70
80
90
100
0
5
65
1 LED
3 LEDs
5 LEDs
7 LEDs
9 LEDs
11 LEDs
13 LEDs
15 LEDs
Typical Operating Characteristics
(V
IN
= V
DIM
= 48V, C
VCC
= 1µF, R
SENSE
= 0.62Ω, L = 220µH (connected between IN and CS). Typical values are at T
A
= +25°C,
unless otherwise noted.)