t6327a TM Technology Inc., t6327a Datasheet - Page 4

• Manufacturer Part Number: t6327a
• Description: Low-dropout, Constant-current White Led With Dimming Control
• Manufacturer: TM Technology Inc.

tm
supply for white LED designs. The T6327A Build
in Morse Code S.O.S Signal and Single Flash
Loop Flicker Function. The T6327A offers
several advantages over using ballast resistors,
such as improved LED dimming, lower bias
variation
significantly lower dropout voltage, and in some
applications, significantly improved efficiency.
Setting the Output Current
flowing into LED1 and LED2 500 or 1000 times,
greater than the current flowing into RSET. Set
the output current as follows:
SOP-8 package each channel:
TO-252 package:
SET Function
dimming and flicker mode.
Dimming step :
If SET pin high pulse width(tSH) over 30ms and
under 2sec(30ms< tSH < 2sec), dimming control
jump to next step.
Mode1(1 dimming step) dimming and flicker step :
Off–> ILED(max.) –> off / loop
If
states(tSH>2sec), LED Flicker mode jump to
Morse Code S.O.S Signal or Single Flash Loop
Flicker Function.
Mode2(2 dimming step) dimming and flicker step :
TM Technology Inc. reserves the right
to change products or specifications without notice.
Functional Description
RSET controls the LED bias current. Current
ILED = 500 (0.306V / RSET )
ILED = 1000 (0.306V / RSET )
The SET is high active LED ON / OFF,
The T6327A provides constant current bias
tSH
3 0 m s < t S H < 2 s e c
O F F
t S H > 2 s e c
pulse
with
CH
TE
3 0 m s < t S H < 2 s e c
width
3 0 m s < t S H < 2 s e c
supply
S . O . S
f l a s h
o r
over
voltage
t S H > 2 s e c
2sec
( m a x . )
I L E D
of
changes,
Any
P. 4
Mode3 (3 dimming step) dimming and flicker
step :
Off –> ILED(max.) -> ILED(max.)(50%) –>
ILED(max.)(25%) -> off / loop
If
states(tSH>2sec), LED Flicker mode jump to
Morse Code S.O.S Signal or Single Flash Loop
Flicker Function.
TEST Function
The test pin is high active, if test pin turns high,
the internal circuit can start the self-test function,
if the function test pass, then LED turns on.
Off–> ILED(max.)-> ILED(max.)(33%)–> off / loop
If
states(tSH>2sec), LED Flicker mode jump to
Morse Code S.O.S Signal or Single Flash Loop
Flicker Function.
tSH
tSH
3 0 m s < t S H < 2 s e c
3 0 m s < t S H < 2 s e c
O F F
O F F
t S H > 2 s e c
t S H > 2 s e c
pulse
pulse
3 0 m s < t S H < 2 s e c
( m a x . )
( 2 5 % )
3 0 m s < t S H < 2 s e c
I L E D
3 0 m s < t S H < 2 s e c
3 0 m s < t S H < 2 s e c
t S H > 2 s e c
width
width
Publication Date: MAR. 2008
( m a x . )
S . O . S
( 3 3 % )
S . O . S
f l a s h
I L E D
f l a s h
3 0 m s < t S H < 2 s e c
o r
o r
t S H > 2 s e c
over
over
3 0 m s < t S H < 2 s e c
3 0 m s < t S H < 2 s e c
t S H > 2 s e c
t S H > 2 s e c
2sec
2sec
t S H > 2 s e c
T6327A
( m a x . )
( 5 0 % )
I L E D
( m a x .)
( m a x . )
I L E D
Revision: A
I L E D
of
of
Any
Any