A6276ELPTR-T Allegro Microsystems Inc, A6276ELPTR-T Datasheet - Page 11

• Manufacturer Part Number: A6276ELPTR-T
• Description: IC LED DRIVER LINEAR 24-TSSOP
• Manufacturer: Allegro Microsystems Inc
• Type: Linear (Non-Switching)r

Specifications of A6276ELPTR-T

• Constant Current: Yes
• Topology: 16-Bit Shift Register
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: General Purpose
• Frequency: 20MHz
• Voltage - Supply: 4.5 V ~ 5.5 V
• Voltage - Output: 1V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP Exposed Pad, 24-eTSSOP, 24-HTSSOP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 75.5mA
• Internal Switch(s): Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -

A6276
The load current per bit (I
(R
Package Power Dissipation (P
low able package power dissipation is determined as
The actual package power dissipation is
where DC is the duty cycle.
When the load supply voltage is greater than 3 V to 5 V,
considering the package power dissipating limits of these
devices, or if P
ducer (V
Load Supply Voltage (V
signed to operate with driver voltage drops (V
0.4 V to 0.7 V with LED forward voltages (V
4.0 V. If higher voltages are dropped across the driver,
package power dissipation will be increased significantly.
To minimize package power dissipation, it is rec om -
mend ed to use the lowest possible load supply voltage or
to set any series dropping voltage (V
with V
EXT
100
80
60
40
20
0
) as shown in the figure below.
100
P
DROP
D
DROP
(act) = DC • (V
CURRENT-CONTROL RESISTANCE, R
= I
) should be used.
o
D
200
P
(act) > P
• R
V
D
(max) = (150 - T
DROP
DROP
300
= V
for a single driver, or a Zener
D
CE
O
(max), an external voltage re-
500
) is set by the external re sis tor
LED
• I
LED
O
700
). These devices are de-
- V
• 16) + (V
F
A
D
1 k
)/R
DROP
- V
). The maximum al-
JA
CE
EXT
V
) as
CE
DD
.
IN OHMS
= 0.7 V
2 k
Applications Information
• I
F
CE
) of 1.2 V to
DD
) of
3 k
) ,
Dwg. GP-061
16-Bit Serial Input, Constant-Current
5 k
diode (V
0.7 V per diode) for a group of drivers. If the available
voltage source will cause unacceptable dissipation and
series resistors or diode(s) are undesirable, a regulator
such as the Sanken Series SAI or Series SI can be used to
pro vide supply voltages as low as 3.3 V.
For reference, typical LED forward voltages are:
Pattern Layout. This device has a common logic-ground
and power-ground terminal. If ground pattern layout
con tains large common-mode resistance, and the voltage
between the system ground and the LATCH ENABLE or
CLOCK terminals ex ceeds 2.5 V (because of switching
noise), these devices may not operate correctly.
V
V DROP
V F
V CE
LED
White
Blue
Green
Yellow
Amber
Red
Infrared
Z
), or a series string of diodes (approximately
Latched LED Driver
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
1.9 – 2.65 V
1.6 – 2.25 V
3.5 – 4.0 V
3.0 – 4.0 V
1.8 – 2.2 V
2.0 – 2.1 V
1.2 – 1.5 V
Dwg. EP-064
10