A6280EA-T Allegro Microsystems Inc, A6280EA-T Datasheet - Page 5

• Manufacturer Part Number: A6280EA-T
• Description: IC,Laser Diode/LED Driver,DIP,16PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: PWM Controlr

Specifications of A6280EA-T

• Constant Current: Yes
• Topology: Linear, PWM
• Number Of Outputs: 3
• Internal Driver: Yes
• Type - Secondary: RGB
• Frequency: 5MHz
• Voltage - Supply: 4.75 V ~ 17 V
• Voltage - Output: 1 V ~ 3 V
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 150mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 620-1256

A6280
(Output Enable Output)
Brightness Data = 1022
(Output Enable Input)
NOTE: At least one rising edge on the CI pin is needed while OE is high in order to reset the PWM counter and start
a new PWM cycle. Otherwise, when OE is brought low, the outputs will operate according to the current PWM data
and PWM count, and will finish the current cycle before resetting the count to 0. Therefore, if the counter is not reset
(as explained above) after new PWM data has been latched, the outputs will complete the current PWM cycle (up to
1024 clock pulses if no clock divider is selected, 2048 clock pulses if a divide-by count of 2 is selected, and so forth)
before starting a new PWM cycle with the new data.
Brightness Data= 0
Brightness Data= 1
(Serial Data Out)
(Serial Data In)
PWM Counter
(Latch Out)
(Latch In)
(Clock In)
(Clock In)
SDO
OEO
I
I
I
OUT0
OUT1
OUT2
t
SDI
OEI
SU (D )
t
SU (O E )
LO
CI
CI
LI
t
t
D30
P(OE)2
P(OE)
0
T
0
0
D29
t
t
1
w(C L K)
H( D)
D28 D27 D26 D24 D23 D22 D21
2
Figure 3. PWM Counter and Output Timing
T
1
3
1
Outputs Off
Outputs On
4
Figure 2. Shift Register Timing
T
2
2
t
P(OUT)
5
Timing Diagrams
3-Channel Constant-Current LED Driver
Don’t Care
6
t
P(OUT)
7
t
w (OE)
with
8
1023
Programmable
T
0
N
t
P(OUT)
D15 D14
15 16
1
2
t
SU (L I )
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
t
P(IO)
D0
31
D30
X
PWM Control
t
t
H (L I )
P(SD O)
0
5