MAX16803 Maxim Integrated Products, MAX16803 Datasheet - Page 7

• Manufacturer Part Number: MAX16803
• Description: High-Brightness LED Driver
• Manufacturer: Maxim Integrated Products

For proper operation, the minimum input voltage must
always be:
where V
connected LEDs. The minimum operating voltage of the
device is +6.5V. The device operates below +6.5V; how-
ever, output current may not meet the full regulation
specification (see the Typical Operating Characteristics ).
The MAX16803 provides pulsed or chopped current
dimming input (DIM). The other method is to connect
DIM to V5 and EN to IN and pulse EN. Both methods
generate a regulated-amplitude PWM current (variable
duty cycle) that can provide control over the LED
brightness (see Figures 1 and 2).
Figure 1. Dimming with EN Connected to V
Voltage and DIM Pulsed
Figure 2. Dimming with DIM Connected to V5, EN Connected
to V
Low-Frequency PWM Dimming at the Output
V
V
DIM
C1
V
IN
IN
V
IN
IN(MIN)
C1
FT(MAX)
Driver with PWM Dimming and 5V Regulator
≥ V
High-Voltage, 350mA, High-Brightness LED
1
2
3
4
1
2
3
4
RSENSE(MAX)
OUT
IN
IN
N.C.
OUT
IN
IN
N.C.
is the total forward voltage of all series
OUT
N.C.
OUT
N.C.
Input-Voltage Considerations
16
16
5
_______________________________________________________________________________________
5
MAX16803
MAX16803
N.C.
N.C.
15
EN
15
EN
6
6
N.C.
N.C.
N.C.
N.C.
14
14
7
7
+ V
FT(MAX)
DIM
N.C.
DIM
N.C.
13
13
8
8
GND
GND
CS+
CS-
CS+
CS-
V5
V5
IN
12
11
10
12
11
10
9
9
+ ∆V
at a Constant
DO(MAX)
C2
C2
D1
D1
R
R
SENSE
SENSE
I
LED
I
LED
For applications that require more than 350mA of LED
current, two or more MAX16803s can be paralleled
(see Figure 3). V
Figure 3. Paralleling MAX16803s
V5
Paralleling Multiple MAX16803s to Drive
V5
V5
C1
C3
EN
DIM
IN
GND
IN
EN
DIM
GND
CS
MAX16803
MAX16803
- should not exceed 4.1V.
OUT
CS+
OUT
CS-
CS+
CS-
V5
V5
One High-Power LED
C2
C4
www.DataSheet4U.com
R1
R2
LEDs
7