ALLEGRO SEPM User Manual

SEPM Series

RGB Multi Chip LED Modules

Features and Benefits

▪ High efficiency, 50 1m/W with all LEDs illuminated;

equivalent to CCFLs

▪ Low thermal resistance, R

= 6°C/W

θJC

▪ High optical output, 25 lm, with all LEDs illuminated
▪ Superior directivity
▪ 5.23 mm × 13.7 mm case footprint, and

low 2.5-mm overall package height

▪ Silver-plated leadframe
▪ LED array of 8 RGB chips

Package:

16-pin, 1.27-mm pitch, surface mount

Description

The SEPM series of LEDs provides a range of high-powered
ALGaInP red (λD = 616 nm), and InGaN green (523 nm)
and blue (461 nm) LEDs that can be used in general lighting
applications, amusement and gaming equipment, and for
backlighting TFT displays. Each module combines 8 LED
chips in 4 separate channels.
Modular design allows the SEPM devices to be easily assembled
into string arrays by simply connecting the modules in series.
The devices also provide superior color balance throughout
the display because of the high density of LEDs that can be
achieved. This also minimizes the distance that power and
control lines must run between LEDs and from the LEDs to
the control electronics.
The white thermoplastic case is an innovative Sanken original
design with exceptional heat dissipation properties. The white
resin compound is especially formulated for superior reflectance
and transmittance of the generated light. Enhanced thermal
dissipation is achieved through the incorporated heatsink on the
bottom of the package. The heatsink can be mated directly to an
external radiator through the PCB for superior heat conduction
allowing dense placement of modules.
The leadframe is plated with silver, providing a highly-reflective
surface for the bottom and sides of the emitting area. The
terminals and heatsink are also silver-plated.

Not to scale

V

B

5 to 20 V

5 V

48101.001, Rev. 2

L1

10 μH

1 μF
36 V

0.1 μF
10 V

D1

SW SW OVP
SEL1
SEL2

SEL3

Allegro

VIN

A8500

LED Driver

IC

EN
PWM
APWM
SKIP

COMP

FSET

ISET

PGND

AGND

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED8

C

O

2.2 μF/50 V

T ypical Application

8 SEPM modules, 8 LEDs each

SEP8Mx

SEP8Mx

SEP8Mx

SEP8Mx

SEP8Mx

SEP8Mx

SEP8Mx

SEP8Mx

The SEPM devices can be mounted in tight
arrays on a single PCB substrate for ease of
manufacture and to provide a dense, uniform
appearance when illuminated.

The application shown here uses eight
SEP8Mx LED modules, each populated by
eight LEDs connected in series. Different
combinations of LEDs can be placed in the
modules

SEPM Series

3

5678

Selection Guide

Part Number LEDs

SEP8MA4001 8

Channels

Color Circuit

Red

Green

Blue

2 LEDs in series

4 LEDs, 2 in series

2 LEDs in series

RGB Multi Chip LED Modules

Internal Circuit Diagram

(Pin Numbers Shown)

16 15 14 13 12 11 10 9

GGRRGGBB

Packing

1000 pieces per reel

SEP8MA8001 8

Absolute Maximum Ratings

Characteristic Symbol Notes Rating Units

Forward Current (Continuous) I

Forward Current (Pulsed) I

Reverse Voltage V

Isolation Voltage V

Operating Temperature T

Storage Temperature T

Maximum Allowable Forward Current

versus Duty Cycle

TA = 25°C, tw ≤ 100 μs

120

(mA)

f

100

80

60

40

20

0

0 10 100

Maximum Allowable Forward Current, I

Duty Cycle (on-time), (%) Ambient Temperature, T

12

4

16 15 14 13 12 11 10 9

Red

Green

Blue

2 LEDs in parallel

4 LEDs in parallel

2 LEDs in parallel

GB

1000 pieces per reel

RGGRBG

12345678

Per element 40 mA

f

Frequency, f = 1 kHz, pulse width, tw = 100 μs 100 mA

fp

R

Measured from device pins to heatsink, with DC voltage applied ±60 V

IS

opr

stg

–40 to 85 °C

–40 to 90 °C

Maximum Allowable Forward Current

versus Ambient Temperature

50

(mA)

f

40

30

20

10

0

0 20406080100

Maximum Allowable Forward Current, I

120

Without heatsink

Ambient Temperature, TA (°C)

50

30

R

(°C/W)

QJA

15

(°C)

A

5V

All performance characteristics given are typical values for circuit or
system baseline design only and are at the nominal operating voltage and
an ambient temperature, T

, of 25°C, unless oth er wise stated.

A

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

2

SEPM Series

Operating Characteristics

Characteristic Symbol Conditions Min. Typ. Max. Units

Electrical

Forward Voltage (per LED channel) V

Reverse Current (per LED channel) I

Optical

Luminous Flux (all channels) Φ

Dominant Wavelength λ

Thermal

Thermal Resistance

RGB Multi Chip LED Modules

Red

SEP8MA4001

Green 5.4 6.4 7.8 V

Each subcircuit: 2 chips in series;
If = 20 mA, TA = 25˚C

Blue 5.2 6.2 7.6 V

f

SEP8MA8001

VR = 5 V – – 10 μA

R

Red

Green 2.7 3.2 3.9 V

Blue 2.6 3.1 3.8 V

Each subcircuit: 1 chip in parallel;

= 20 mA, TA = 25˚C

I

f

Red

I

Green 12.0 17.0 – lm

= 20 mA / LED

f

Blue 1.5 2.2 – lm

Red

Green 518 524 530 nm

D

If = 20 mA TA = 25°C

Blue 455 460 465 nm

R

R

Junction to heat sink – 6 – °C/W

θJC

Junction to ambient – 120 – °C/W

θJA

3.4 4.4 5.4 V

1.7 2.2 2.7 V

3.5 5.0 – lm

615 625 635 nm

Chromaticity

TA= 25°C, If = 20 mA

0.9

0.8

0.7

0.6

0.5

Y

0.4

0.3

0.2

0.1

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

0. 151,

0.698

0.699,

0.301

0.146,

0.038

X

R

G

B

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

3

SEPM Series

RGB Multi Chip LED Modules

100

75

50

25

100

75

50

25

0

-80

-90

Long Axis Direction

-70

-40

-50

-60

Relative Intensity (%)

0

-90

100

-80

-70

-60

50

40

-

-

Directivity

TA= 25°C, If = 20 mA, Viewing Angle

100

75

2Q

=124°

1/2

0

-10

-20

-30

2Q

=133° 2Q

1/2

0

-10

-20

-30

40

30

20

10

40

20

10

30

80

90

60

70

50

50

90

80

70

60

50

25

0

-80

-90

100

75

50

25

Relative Intensity (%)

0

-80

-90

100

1,2

= 2θ

1/2

Short Axis Direction

2Q

1/2

-70

-70

-60

-60

-50

-50

-40

-40

-30

-30

-20

-20

-10

1/2

-10

=121°

0

10

=116°

0

10

40

30

60

80

20

50

40

50

20

30

90

70

90

80

70

60

75

50

Blue LEDs Green LEDs Red LEDs

25

0

-80

-90

-70

50

-

-60

Long Axis

Module

Top View

75

2Q

=131° 2Q

1/2

0

-20

-10

10

Short Axis

40

-

-30

50

40

20

30

90

80

70

60

1

50

Blue LEDs Green LEDs Red LEDs

25

0

-70

-40

-50

-60

-80

-90

θ

is the angular displacement from the indicated device

1/2

-30

-20

1/2

-10

=116°

0

10

20

40

50

30

70

60

90

80

axis to 50% of peak intensity, on one side of that axis.

2

Viewing Angle, 2θ

– θ

and θ

1/2

for the indicated axis.

1/2

, is the included angle between

1/2

Relative Luminescence Spectrum

Blue at 100%, TA= 25°C, If = 20 mA

100

80

60

40

20

0

380 430 480 530 580 630 680 730 780

Relative Luminescence (%)

Blue

Red

Green

Emission Frequency (nm)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

4

SEPM Series

RGB Multi Chip LED Modules

Forward Current versus Forward Voltage

2 LEDs in Series

Red LEDs

100

(mA)

f

I

10

3.0 4.0 5.0 6.0

Vf (V)

Red LEDs

2 LEDs in Series

20
18
16
14
12
10

8

& (lm)

6
4
2
0

0 102030405060

If (mA)

Green LEDs Blue LEDs

100

(mA)

f

I

10

12.0 13.0 14.0 15.0 16.0

(mA)
I

Vf (V)

Luminous Flux versus Forward Current

Green LEDs

4 LEDs in Series

60.0

50.0

40.0

30.0

& (lm)

20.0

10.0

0.0
0 102030405060

If (mA)

10.0

& (lm)

100

f

10

5.0 6.0 7.0 8.0

Vf (V)

Blue LEDs

2 LEDs in Series

8.0

6.0

4.0

2.0

0.0
0 102030405060

If (mA)

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com

5