CL8801 DATA SHEET (06/22/2014) DOWNLOAD

Supertex inc.
CL8801
Sequential Linear LED Driver
Features
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General Description
Minimal component count
(base config: CL8801 + 4 resistors + diode bridge)
No magnetics, no capacitors
Up to 7.5W output (13W w/ heat sink)
>110Lm/W using efficient LEDs
85% electrical efficiency
>0.95 power factor
<30% THD line current
Low conducted EMI w/o filters
85% LED luminous utilization
Phase dimmer compatible with an RC network
Applications
►► Fluorescent tube retrofit
►► Incandescent & CFL bulb replacement
►► General LED lighting
The CL8801 is designed to drive a long string of inexpensive,
low current LEDs directly from the AC mains. A basic driver
circuit consists of the CL8801, four resistors, and a bridge
rectifier. Two to four additional components are optional for
various levels of transient protection. No capacitors, EMI
filters, or power factor correction circuits are needed.
A string of series/parallel LEDs is tapped at four locations.
Four linear current regulators sink current at each tap and
are sequentially turned on and off, tracking the input sine
wave voltage. Voltage across each regulator is minimized
when conducting, providing high efficiency. Output current
at each tap is individually resistor-adjustable. Crossregulation, as the CL8801 switches from one regulator to
the next, provides smooth transitions. The current waveform
can be tailored to optimize for input voltage range, line/load
regulation, output power/current, efficiency, power factor,
THD, dimmer compatibility, and LED utilization.
With the addition of an RC network, the driver is compatible
with phase dimming.
Typical Application Circuit
transient
protection
AC
Mains
BIAS
GND
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TAP1
TAP2
TAP3
TAP4
SET3
SET4
CL8801
SET1
SET2
Supertex inc.
www.supertex.com
CL8801
CL8801K63-G M935
33-Lead (6x6) QFN
2000/Reel
33
GND
1
GND
GND
GND
GND
GND
GND
4.0V
Operating junction temperature
-55ºC to +125ºC
Storage temperature, TS
-65°C to +150°C
Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability. All
voltages are referenced to device ground.
33-Lead QFN
(top view)
Product Marking
8801
LLLLLL
YYWW
AAACCC
Typical Thermal Resistance
θja1
θjc2
33-Lead QFN
24OC/W
2.5OC/W
NC
VSET1–4
NC
–0.5V to +320V
SET4
VTAP2–4
NC
–0.5V to +550V
GND
NC
VBIAS, VTAP1
GND
SET3
Value
GND
NC
Parameter
GND
GND
SET2
Absolute Maximum Ratings
GND
GND
SET1
ESD Sensitive Device
GND
GND
GND
NC
-G denotes a lead (Pb)-free / RoHS compliant package
Package
TAP4
490/Tray
NC
33-Lead (6x6) QFN
TAP3
CL8801K63-G
NC
Packing
TAP2
Package Options
BIAS
Part Number
TAP1
Pin Configuration
Ordering Information
L = Lot Number
YY = Year Sealed
WW = Week Sealed
A = Assembler ID
C = Country of Origin
= “Green” Packaging
33-Lead QFN
Notes:
1. 1.0oz Cu 4-layer board, 3x4” PCB with thermal pad and thermal via array.
2. Junction to exposed heat slug.
Recommended Operating Conditions
Sym
IOUT
VOUT
VBIAS
Parameter
Output current
Output voltage
Min
Typ
Max
TAP1
-
-
60
TAP2
-
-
90
TAP3
-
-
200
TAP4
-
-
200
TAP1
-
-
400
TAP2-4
-
-
300
TAP1-4
-
-
(1)
-
-
440
Applied BIAS voltage
Units Conditions
mA
---
Non-conducting
V
Non-conducting
Conducting
V
---
Note:
(1) Voltage capability is determined by power dissipation (V × I).
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Supertex inc.
www.supertex.com
CL8801
Electrical Characteristics (over recommended operating conditions at 25°C unless specified otherwise)
Sym
Parameter
IBIAS
BIAS pin input current
ITAP(ON)
ITAP(OFF)
VREG
Min
Typ
Max
Units
Conditions
-
250
410
µA
VBIAS = 170V
TAP1
60
-
-
TAP2
90
-
-
TAP3
200
-
-
TAP4
200
-
-
-
0
10
SET1 - 3
1.80
2.00
2.20
SET4
1.89
2.10
2.31
Output current, on
Output current, off
Regulation voltage at SET pins
VTAP1 = 30V, VSET1~4 = GND
VTAP2 = 17V, VSET1~4 = GND
mA
VTAP3 = 17V, VSET1~4 = GND
VTAP4 = 17V, VSET1~4 = GND
µA
TAP1 - 3, VBIAS = 170V
V
---
Output Current Thermal Characteristics
Maximum Output Current
400
350
300
IOUT (mA)
250
Taps 3&4
200
150
100
Tap 2
50
Tap 1
0
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
Simplified Block Diagram
120V transient
protection
AC
Mains
TAP1
BIAS
TAP2
1 0
in reg
TAP3
1 0
TAP4
1 0
GND
CL8801
SET1
SET2
RSET1
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3
SET3
RSET2
SET4
RSET3
RSET4
Supertex inc.
www.supertex.com
CL8801
Overview
board-to-board connections. Disadvantages include slightly reduced efficiency at high line, and additional heat load
on the driver board.
Designing a driver to meet particular requirements may be
a difficult task considering the number of design variables
(16): tap current (4), number of series-connected LEDs per
segment (4), and the number of parallel-connected LEDs
per segment (4). Manually selecting values will provide light,
but the chosen values may be far from optimal in regards to
efficiency, LED utilization, line regulation, etc.
Phase Dimming
As with any light load, the LED lamp might not draw
enough current to assure proper dimmer operation. This
is especially true for 230VAC dimmers. Triacs used in dimmers require a minimum latching current when triggered
to place the triac in the latched-on state. Once latched, a
minimum holding current is required to maintain the triac in
the on state. Latching current is many times greater than
the holding current, and is the main concern with dimmer
compatibility.
Contact your nearest Supertex Field Applications Engineer
for design assistance. MathCAD and Excel worksheets are
available by contacting [email protected]
In addition to configuring the driver, several circuits may be
employed to increase reliability, performance, and cost. The
following sections briefly describe these circuits.
Higher latching current can be provided by a simple series
RC network across the AC line. A short time constant provides a current spike at the turn-on edge.
Transient Protection
Since the driver circuits have no need for capacitors that
could otherwise absorb transient energy, nor is there a need
for EMI filters that would block transients, the full burden of
transient protection is borne by the protection circuit. The
two-stage approach in the following schematics provide
2.5kV protection, both pulse and ring per EN 61000-4-5 and
EN 61000-4-12, six hits each.
Less common is inadequate holding current. The minimum
dimmer holding current is typically 10-20mA. Tap1 at 60mA
(max) exceeds the minimum.
AC Line
100 to 120VAC Transient Protection
Transient
Protection
500Ω
Bridge
Rectifier
100 - 200nF
22Ω
AC Line
Flicker
150VAC
10mm
Twice per AC line cycle the line voltage crosses zero volts,
during which time there is no light output.
The circuit below can provide 5-10% valley fill. It has little
effect on input current waveshape (THD, PF) and efficiency.
230VAC Transient Protection
22Ω
33Ω
Power Boost
Higher output power can be achieved by off-loading a portion of the power dissipation from the CL8801 to external FETs. The circuit below drops most of the tap voltage
across the FETs, thereby shifting the bulk of the dissipation
to the FET.
AC Line
275VAC
10mm
440VDC
1.5kW
Zener Substitution
to LEDs
Zeners may be substituted for LEDs in the bottom stages. The last 1 or 2 stages contribute little to light output - they
are mainly to off-load the adjacent upstream regulator at
high line voltages to minimize losses. Zener substitution
advantages include minimizing unlit LEDs at low line for
better light uniformity, better line regulation at high line,
fewer LEDs for lower cost and less PCB area, and fewer
200kΩ
TAP2
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to LEDs
15V
TAP3
Supertex inc.
www.supertex.com
CL8801
Valley Fill Circuit
Optional flicker
reduction circuit
(valley fill)
CF1
RF1
10kΩ
RF3
QF1
TAP1
RF2
150kΩ
TAP2
TAP3
TAP4
CL8800
BIAS
RS1
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QF2
DN3135
RS2
5
GND
RS3
RS4
Supertex inc.
www.supertex.com
CL8801
Pin Description
Pin #
Pin
Name
Description
1-8
GND
Circuit common (use for heat sink ground plane pass through).
9
SET1
Current sense for linear current regulators for each tap. Resistors on these pins sets the tap currents.
10
NC
11
SET2
12
NC
13
SET3
14
NC
No internal connection.
15
NC
No internal connection.
16
NC
No internal connection.
17
SET4
18
NC
19 - 20
GND
Circuit common (use for heat sink ground plane pass through).
21
GND
Circuit common. Connect to bridge rectifier return (use for heat sink ground plane pass through).
22 - 26
GND
Circuit common (use for heat sink ground plane pass through).
27
TAP4
Current regulator outputs. Connect to taps along the LED string.
28
NC
29
TAP3
30
NC
31
TAP2
Current regulator outputs. Connect to taps along the LED string.
32
TAP1
Current regulator outputs. Connect to taps along the LED string.
33
BIAS
Provides bias for driver. Connect to rectified AC.
Underside plate
(GND)
No internal connection.
Current sense for linear current regulators for each tap. Resistors on these pins sets the tap currents.
No internal connection.
Current sense for linear current regulators for each tap. Resistors on these pins sets the tap currents.
Current sense for linear current regulators for each tap. Resistors on these pins sets the tap currents.
No internal connection.
No internal connection.
Current regulator outputs. Connect to taps along the LED string.
No internal connection.
For heatsinking purposes, it should be soldered to a 4.0cm2 exposed copper area. It should also
be electrically connected to circuit common (GND).
Note:
The high voltage pins are located on one side of the package and are arranged from lowest voltage to highest. Pin-to-pin voltage gradients are minimized.
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Supertex inc.
www.supertex.com
CL8801
33-Lead QFN Package Outline (K6)
6.00x6.00mm body, 1.00mm height (max), 0.50mm pitch
D
33
D2
Note 4
0.70mm (min)
1
33
1
Note 1
(Index Area
D/2 x E/2)
e
Note 1
(Index Area
D/2 x E/2)
E
E2
b
View B
Top View
Bottom View
Note 3
θ
A
A3
L
Seating
Plane
A1
L1
Note 2
Side View
View B
Notes:
1. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; or
a printed indicator.
2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present.
3. The inner tip of the lead may be either rounded or square.
4. There will be an exposed DAP. A minimum of 0.7mm spacing will be maintained between the leads and the DAP.
Symbol
Dimension
(mm)
A
A1
MIN
0.80
0.00
NOM
0.90
0.02
MAX
1.00
0.05
A3
0.20
REF
b
D
D2
E
E2
e
0.18
5.85
4.00
5.85
3.60
0.25
6.00
4.15
6.00
3.75
0.30
6.15
4.25
6.15
3.85
0.50
BSC
L
L1
θO
0.30
0.00
0
0.40
-
-
0.50
0.15
14
Drawings not to scale.
Supertex Doc. #: DSPD-33QFNK636X6P050, Version A021312.
(The package drawings in this data sheet may not reflect the most current specifications. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability
to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)
Supertex inc.
©2014 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Doc.# DSFP-CL8801
D031914
7
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
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