Document
Supertex inc.
CL8800
Sequential Linear LED Driver
Features
►► Minimal component count (base config: CL8800 + 6 resistors + diode bridge)
►► No magnetics, no capacitors ►► Up to 7.5W output (13W w/ heat sink) ►► >110Lm/W using efficient LEDs ►► 85% typical electrical efficiency ►► >0.95 power factor ►► <20% 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
General Description
The CL8800 is designed to drive a long string of inexpensive, low current LEDs directly from the AC mains. A basic driver circuit consists of the CL8800, six 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 six locations. Six 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 resistoradjustable. Cross-regulation, as the CL8800 switches from one regulator to another, 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
100 - 120VAC additional components for 230VAC
TAP1 BIAS
GND SET1
TAP2 SET2
TAP3
TAP4
CL8800
SET3
SET4
TAP5 SET5
TAP6 SET6
Doc.# DSFP-CL8800 D031914
Supertex inc. www.supertex.com
CL8800
Ordering Information
Part Number
Package Options
CL8800K63-G
33-Lead (6x6) QFN
CL8800K63-G M935 33-Lead (6x6) QFN
-G denotes a lead (Pb)-free / RoHS compliant package
Packing 490/Tray 2000/Reel
ESD Sensitive Device
Absolute Maximum Ratings
Parameter
Value
VBIAS, VTAP1 VTAP2 – 6 VSET1 – 6 Operating junction temperature
–0.5V to +550V –0.5V to +320V
4.0V -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.
Typical Thermal Resistance
Package
θja1
θjc2
33-Lead QFN
24OC/W
2.5OC/W
Notes: 1. 1.0oz Cu 4-layer board, 3x4” PCB with thermal pad and thermal via array. 2. Junction to exposed heat slug.
BIAS TAP1 TAP2 TAP3 TAP4 TAP5 TAP6
Pin Configuration
GND GND GND GND GND GND GND GND
1
33
GND
SET1 NC
SET2 NC
SET3 NC
SET4 NC
SET5 SET6
33-Lead QFN
(top view)
Product Marking
8800 LLLLLL YYWW AAACCC
L = Lot Number YY = Year Sealed WW = Week Sealed A = Assembler ID C = Country of Origin
= “Green” Packaging
33-Lead QFN
GND GND GND GND GND GND GND GND
Recommended Operating Conditions
Sym Parameter
Min Typ Max Units Conditions
TAP1
- - 60
IOUT Output current
TAP2 TAP3 TAP4
- - 90 - - 115
mA --- - 115
TAP5 TAP6 TAP1
- - 115 - - 115 - - 400
Non-conducting
VOUT Output voltage
TAP2-6 TAP1-6
-
VBIAS Applied BIAS voltage
-
Note: (1) Voltage capability is determined by power dissipation (V × I).
- 300 V Non-conducting
- (1)
Conducting
- 440 V ---
Doc.# DSFP-CL8800 D031914
Supertex inc.
2 www.supertex.com
CL8800
Electrical Characteristics (over recommended operating conditions at 25°C unless specified otherwise)
Sym Parameter
Min Typ Max Units Conditions
IBIAS
ITAP(ON)
ITAP(OFF) VREG
BIAS pin input current
Output current, on
Output current, off Regulation voltage at SET pins
TAP1 TAP2 TAP3 TAP4 TAP5 TAP6
SET1 - 5 SET6
- 250 410
60 -
-
90 -
-
115 -
-
115 -
-
115 -
-
115 -
-
- 0 10
1.80 2.00 2.20
1.89 2.10 2.31
µA VBIAS = 340V VTAP1 = 30V, VSET1~6 = GND VTAP2 = 17V, VSET1~6 = GND
mA VTAP3 = 17V, VSET1~6 = GND VTAP4 = 17V, VSET1~6 = GND VTAP5 = 17V, VSET1~6 = GND VTAP6 = 17V, VSET1~6 = GND
µA TAP1 - 5, VBIAS = 312V
V ---
Output Current Thermal Characteristics
Maximum Output Current
250
IOUT (mA)
200
Taps 4&5
150
Taps 3&6
100
Tap 2
50
Tap 1
0
-60 -40
-20
0
20 40 60 80 100 120 140
Temperature (°C)
Simplified Block Diagram Transient Protection
AC Mains
22Ω 33Ω
275VAC 10mm
440VDC 1.5kW
100 - 120VAC additional components for 230VAC
TAP1
TAP2
TAP3
TAP4
TAP5
TAP6
BIAS 1 0 1 0 1 0 1 0 1 0 1 0
in reg
in reg
in reg
in reg
in reg
GND
CL8800
SET1
SET2 RSET1
SET3 RSET2
SET4 RSET3
SET5
SET6
RSET4
RSET5
RSET6
Doc.# DSFP-CL8800 D031914
Supertex inc.
3 www.supertex.com
CL8800
Overview
Designing a driver to meet particular requirements may be a difficult task considering the num.