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PDF AL1663R Data sheet ( Hoja de datos )
| Número de pieza | AL1663R | |
| Descripción | UNIVERSAL FLYBACK AND BUCK-BOOST SINGLE STAGE DIMMABLE LED CONTROLLER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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AL1663/AL1663R
UNIVERSAL FLYBACK AND BUCK-BOOST
SINGLE STAGE DIMMABLE LED CONTROLLER
Description
The AL1663/AL1663R is a high performance single stage Flyback
and Buck-boost controller, targeting dimmable LED lighting
application. It is a primary side regulation (PSR) controller which can
provide accurate constant current (CC) regulation without opto-
coupler and secondary control circuitry. It is operating at BCM mode
which results in good EMI and efficiency, and keeps high PF and low
total harmonic distortion (THD) under universal input voltage.
The AL1663/AL1663R can support multiple dimming modes. When a
0.3 to 2.4V DC signal is applied on APWM pin, the device will operate
in analog dimming mode. When a digital signal is applied on APWM
pin, the device works at PWM dimming mode. And for AL1663 When
a digital signal is applied on PWMD pin and the APWM pin is
connected with a hundreds of nF capacitor, the device will work in
PWM-to-DC dimming mode.
The AL1663/AL1663R features low start-up current and low operation
current. It integrates multiple protections including over voltage, short
circuit, over current and over temperature protection.
Pin Assignments
APWM 1
PWMD 2
COMP 3
CS 4
(Top View)
8 FB
7 VCC
6 OUT
5 GND
NC 1
FB 2
CS 3
GND 4
8 APWM
7 COMP
6 VCC
5 OUT
AL1663
SO-8
AL1663R
SO-8
Applications
General LED Lighting Driver with Dimming Function
General Purpose Constant Current Source
LED Backlighting Driver
Smart LED Lighting
The AL1663/AL1663R is available in SO-8 package.
Features
Primary Side Regulation without Opto-coupler
Valley Switching for Low Switching Loss
Low Start-up Current
High PF and Low THD
High Efficiency
Tight LED Current Variation Range
Tight Output Open Voltage Variation Range
Support both PWM Dimming and Analog Dimming
Internal Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Output Short Protection (OSP)
Over Current Protection (OCP)
Thermal Fold-back Protection (TFP)
Over Temperature Protection (OTP)
Low System Cost
Package: SO-8
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AL1663/AL1663R
Document number: DS38466 Rev. 1 - 2
1 of 15
www.diodes.com
May 2016
© Diodes Incorporated
1 page  
AL1663/AL1663R
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min
UVLO Section
VCC_TH
Startup Threshold Voltage
VOPR_MIN
Minimal Operating Voltage
VCC_OVP
VCC OVP Voltage
Standby Current Section
IST Startup Current
ICC
ICC_OVP
Operating Current
Shunt Current in OVP Mode
–
After Turn On
–
17
7
25
VCC = VCC_TH -0.5V, before start
up
FB, CS connect to GND, CGATE =
100pF
VCC > VCC_OVP
–
–
–
Drive Output Section
tR Output Voltage Rise Time (Note 6)
tF Output Voltage Fall Time (Note 6)
VOUT_CLAMP
Output Clamp Voltage
tON_MIN
Minimum On Time (Note 6)
tON_MAX
Maximum On Time
tOFF_MAX
Maximum Off Time
tOFF_MIN
Minimum Off Time
fMAX
Maximum Frequency
Internal CS reference
VREF
VCS_OCP
Error Amplifier
Internal Reference Voltage
Primary Current Clamp Voltage
Gm Trans-Conductance
ISOURCE
Amplifier Source Current
Feedback Input Section
VFB_CV
APWM Section
FB CV Threshold
VAPWM_L
VAPWM_H
–
PWM Signal Low Threshold Voltage
PWM Signal High Threshold Voltage
Linear Dimming Range on APWM
CL = 1nF
CL = 1nF
VCC = 20V
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
13
–
–
–
–
–
0.291
–
–
–
1.4
–
2.4
0.3
PWMD Section
VPWM_L
PWM Signal Low Threshold Voltage
VPWM_H
PWM Signal High Threshold Voltage
Thermal Fold-back Section
–
–
–
2
TREG
Overheating Temperature Regulation
(Note 6)
Over Temperature Protection Section
–
– Shutdown Temperature (Notes 6, 7) –
–
–
Notes:
6. These parameters, although guaranteed by design, are not 100% tested in production.
7. The device will latch when OTP happens and the device won’t operate constantly at this temperature.
AL1663/AL1663R
Document number: DS38466 Rev. 1 - 2
5 of 15
www.diodes.com
Typ
18.5
7.8
27
0.8
1
5
90
30
14
400
22
35
2
150
0.3
1.2
16.7
10
1.5
–
–
–
–
–
+145
+165
Max Units
20 V
8.5 V
29.9 V
– µA
– mA
– mA
– ns
– ns
15 V
– ns
– µs
– µs
– µs
– KHz
0.309
–
V
V
– µA/V
– µA
1.6 V
0.3 V
–V
2.4 V
0.4 V
–V
– oC
– oC
May 2016
© Diodes Incorporated
5 Page 
AL1663/AL1663R
Application Information (Cont.)
Operation Parameters Design
Setting the Current Sense Resistor RCS
The current sense resistance can be calculated as following:
RCS
N PS VREF
2 IO _ MEAN
Where IO_MEAN is the mean output current; RCS is current sense resister which is shown as Figures 1 and 2;
VREF is internal reference voltage that is equal to 0.3V; NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost).
Setting Transformer Selection (T1)
NPS is limited by the electrical stress of the switch MOSFET, can be calculated by below formula.
N PS
VMOS _(BR)DS
90% 2 VIN _ MAX
VO VD _ F
VS
Where VMOS_(BR)DS is the breakdown voltage of the switch MOSFET. VIN_MAX is the max rated input voltage. ∆VS is the overshoot voltage
clamped by RCD snobbier during OFF time. VO is the output voltage. VD_F is the forward voltage of secondary diode. NPS is the turns ratio of
Flyback transformer (NPS=1 for Buck-boost);
For boundary conduction mode and constant on time method, the peak current of primary inductance can be calculated as below.
IP
NPS sin( )
0
2 IO _ MEAN
2 VIN _ RMS sin( )
d
2 VIN _ RMS sin( ) NPS Vo
Where VIN_RMS is the rate input voltage; IP is the primary inductance current. NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost);
IO_MEAN is the mean output current; VO is the output voltage.
The switching frequency is not constant for AL1663/AL1663R due to boundary conduction mode. To set the minimum switching frequency fMIN at
the crest of the minimum AC input, primary inductance can be obtained by below formula.
LP IP (
2 VIN _ RMS NPS VO
2VIN _ RMS NPSVO ) fMIN
Where VIN_RMS is the rate input voltage; IP is the primary inductance current. NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost);
IO_MEAN is the mean output current; VO is the output voltage; fMIN is the minimum switching frequency at the crest of the minimum AC input.
According to the Faraday’s Law, the winding number of the inductance can be calculated by:
NP
LP IP
Ae Bm
NS
NP
N PS
Where,
Ae is the core effective area.
Bm is the maximum magnetic flux density.
AL1663/AL1663R
Document number: DS38466 Rev. 1 - 2
11 of 15
www.diodes.com
May 2016
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AL1663R.PDF ] | |
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