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A711 Schematic ( Datenblatt PDF ) - ADDtek

Teilenummer A711
Beschreibung 1.1A HIGH VOLTAGE ADJUSTABLE CURRENT REGULATOR
Hersteller ADDtek
Logo ADDtek Logo 

Gesamt 15 Seiten
		
A711 Datasheet, Funktion
www.addmtek.com
DESCRIPTION
The A711 is a high voltage, low dropout current
regulator for high power LED, that the maximum output
current can be up to 1.1Amp. The output current was
decided by an external resistor. The output sink current
could be disabled via OE pin. PWM dimming function
could also be controlled by OE pin.
TO-263 package is available for good power
dissipation ability. Build-in thermal protection to prevent
the chip from over heat damage, and adequate thermal
pad PCB area is required to control the junction
temperature below 125°C.
TYPICAL APPLICATION CIRCUIT
5V~50V
CBP
Enable/
PWM Dimming
RSET
OE
ISET
VDD
A711
GND
OUT
CO
A711
1.1A HIGH VOLTAGE
ADJUSTABLE CURRENT REGULATOR
WITH ENABLE CONTROL
FEATURES
0.8V Output Drop-out Voltage at 1.1Amp.
1.1Amp. Maximum Output Current.
Output Current Controlled by External Resistor.
3us Fast Response Output Stage Enable Control.
Output Pin Sustain Voltage Up To 75V.
Supply Voltage Range 5V~50V.
TO-263-5L package.
APPLICATIONS
High Power LED Driver
RGB Full Color Power LED driver
LCD Monitor/TV LED Backlight Driver
LED Lighting
LED Street Lamp / Table Lamp
PACKAGE PIN OUT
5
4
3
2
1
TO-263-5L
(Top View)
OUT
OE
GND
ISET
VDD
5 OUT
4 OE
3 GND
2 ISET
1 VDD
TO-252-5L
(Top View)
5 OUT
4 OE
3 GND
2
TO-220-5L
ISET
1 VDD (Top View)
ORDER INFORMATION
V
TO-263-5L
5 pin
P
TO-220-5L
5 pin
S
A711VFT
A711PFT
Note:
Part Number: A 7 1 1 □ □ □
Package Type. V: TO-263-5L
P: TO-220-5L
S: TO-252-5L
Packing.
T: Tape & Reel
Package Process. F: Lead Free; G: Green
TO-252-5L
5 pin
A711SGT
Copyright © 2008 ADDtek Corp.
1 DD084_B -- DECEMBER 2008






A711 Datasheet, Funktion
A711
APPLICATION INFORMATION
A711 is a high voltage, high current, and low dropout current regulator for maximum output current up to 1.1A.
The OE pin is used for enabling/disabling the output stage of the chip. The current could be linearly adjusted through
external resister, RSET, connected to ISET pin, or by PWM control via OE pin. Although the absolute maximum rating of
OUT pin 75V, the dropout voltage between OUT pin and GND pin should not be too large when current is sinking
because of the heat dissipation capability of the package and PCB layout.
Setting LED Current
An external resistor RSET connected to ISET pin sets the sink current of OUT pin. The value of RSET is calculated by
the following formula:
I OUT
=
I SET
500 =
1.2V
RSET (K)
500
(mA)
PWM Dimming Control
A711 provides PWM dimming control function through OE pin. Basically, by changing the duty cycle of the
PWM control signal, the ratio of LED ON-time to OFF-time can be changed. Consequently, larger duty cycle results in
larger average current for driving LED and thus higher luminance.
Ideally, the average LED driving current is in linear proportion to the duty cycle of the PWM control signal in
spite of the frequency. However, due to the inherent propagation delay of the chip and the rising/falling time of the
driving current, the deviation of the actual current from theoretical value will become larger when the PWM frequency
gets higher. That is, if the PWM frequency exceeds certain recommended value, the effect of the fixed propagation
delay and the rising/falling time of LED current on the linear relationship between the duty cycle and the average
current will become more apparent. On the other hand, if the PWM frequency is too low, the flicker will become
observable. Therefore, it is important to choose a suitable frequency for the PWM signal.
Please refer to the following timing chart & table for the limitation of maximum dimming frequency. It is
determined by the minimum duty ratio, DMIN, and the minimum LED “ON” time, tON,MIN. The maximum dimming
frequency, fPWM, can be calculated by the following formula:
1 = tON ,MIN
f PWM ,MAX
DMIN
Where, duty ratio is defined as:
D = tON
tON + tOFF
Copyright © 2008 ADDtek Corp.
6 DD084_B -- DECEMBER 2008

6 Page







A711 pdf, datenblatt
Top Marking
PACKAGE
A711
A711
YWWT
A711
YWWT
A711
YWWT
Y : Year Code
WW : Week Code
T : Trace Code
: Lot Number (LF)
: Lot Number (GP)
A711VFT
A711PFT
5-Pin Surface Mount TO-263
A
I
B
K
M
F
G
A711SGT
C
D
N
L
E
INCHES
MILLIMETERS
MIN TYP MAX MIN TYP MAX
A 0.395 - 0.420 10.03 - 10.67
B 0.325 - 0.361 8.25 - 9.17
C 0.171 - 0.181 4.34 - 4.59
D 0.045 - 0.055 1.14 - 1.40
E 0.013 - 0.017 0.330 - 0.432
F 0.029 - 0.035 0.737 - 0.889
G 0.062 - 0.072 1.57 - 1.83
I-
- 0.065 -
- 1.65
K 0.575
0.635 14.60
16.13
L 0.090
0.110 2.29
2.79
M 7°
7°
N 3°
3°
Copyright © 2008 ADDtek Corp.
12 DD084_B -- DECEMBER 2008

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