AL9910EV5 User Guide Issue 3

AL9910EV5 BUCK LED DRIVER USER GUIDE
Fig. 1 AL9910EV5 evaluation board connection diagram
Issue 3 – June 2011
© Diodes Incorporated, 2011
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AL9910EV5
DESCRIPTION
The AL9910EV5 is an offline non-isolated LED driver Evaluation board designed to work on both 115V and
230V AC line voltages. It provides a constant LED current output which drives a single string of between 14
and 18 LEDs, with a LED current of 240mA.
The evalution board is designed with a footprint to fit iinside a T8 LED fluorescent replacement lamp tube. It
will provide a total LED power ranging from 10W to 13W.
AL9910EV5 SETUP AND TESTING PROCEDURE
Prerequiste
1. AL9910EV5 evaluation board.
2. A set of 240mA LEDs strings with 14 to 18 series-connected LEDs. The LEDs should be mounted on a
heatsink capable of a power dissipation of 10 to 13W.
3. For safety reasons during testing, please use an isolated 115V or 230V AC source from the output of an
isolation tranformer. For public demonstration, the evaluation board and LEDs should be fitted into a
transparent case with sufficient insulation to meet the local safety requirements.
Connections and Power up
1. Preset the isolated AC source to either 115VAC or 230VAC.
2. ENSURE THAT THE AC SOURCE IS SWITCHED OFF OR DISCONNECTED.
3. Connect the anode wire of the LED string to the LED+ terminal which is located at the right hand side of
evaluation board.
4. Connect the cathode wire of the LED string to the LED - terminal which is located at the right hand side of
the evaluation board.
5. Connect a voltmeter & ammeter according to the connection diagram in Figure 1 if LED current and
voltage measurements are required.
6. Connect the two AC line wires to the AC1 and AC2 terminals which are located at the left hand side of
evaluation board.
7. Ensure that the area around the board is clear and safe, and preferably that the board and LEDs are
enclosed in a transparent safety cover.
8. Turn on the mains switch. LED string should light up with LED current of 240mA +/-15%. DO NOT TOUCH
THE BOARD, LEDs OR BARE WIRING.
Caution: The AL9910EV5 is a non-isolated design. All
terminals carry high voltage during operation!
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AL9910EV5
OPERATION
The AL9910A device is a PWM high-efficiency LED driver control IC. It allows efficient operation of High
Brightness (HB) LEDs from voltage sources ranging from 85VAC up to 265VAC. The AL9910A can be
configured to work in either fixed frequency or constant OFF-time mode. In fixed frequency mode, the
AL9910A controls an external MOSFET at a fixed switching frequency up to 300kHz, which can be
programmed using a single resistor. The LED string is driven at a constant current rather than at a constant
voltage, thus providing constant light output and enhanced reliability. The output current can be programmed
between a few milliamps and more than 1.0A.
Input filter and Rectifier section
In order to meet the EMI requirement, Cx1, Cx2, CX3, CX4, L1 and L2 are used to provide sufficient filtering
for both differential-mode and common-mode noise generated from the switching converter circuit after the
bridge rectifier.
The rectified line voltage from the bridge rectifier DB1 is fed into a valley-filled passive power factor correction
stage to provide a high power factor for the AC line input. The passive PFC stage comprises of C11, C2, D1,
D2, D3 and R1. This design gives power factors of greater than 0.9 at low line voltage.
Constant Current Buck Converter section
The buck converter section consists of LED controller AL9910A (U1), Ultra-fast free-wheeling rectifier SF30JG
(D4), Inductor (L3 and L4) and a high voltage MOSFET switch (Q1). On this evaluation board, the AL9910A is
configured to operate in the constant OFF-time mode to provide the best LED current regulation. The constant
OFF-time of the AL9910A’s gate output is set to approximately 14µs using resistor R9. Please refer to the
product datasheet for more details on how to configure the constant OFF-time mode.
The circuit values have been designed to provide an output current of 240mA. The LED current level is set by
resistors R5-R7. For detailed applications information please refer to the AL9910/A datasheet.
There is also provision for an optional gate transistor pair (Q2) to drive a MOSFET with a higher gate charge if
a higher LED current is required. Q2 is a high current gate driver in a SOT23-6 package.
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3
AL9910A
AL9910EV5
Fig. 2 AL9910EV5 Schematic Diagram
Issue 3 – June 2011
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© Diodes Incorporated 2011
4
AL9910EV5
PARTS LIST
Ref
U1
D1 D2 D3
D4
DB1
C1 C2
C3 C6
C4
C5
CX1 CX2
CX3 CX4
F1
JP1
L1
L2
L3 L4
MOV1
NTC1
Q1
Q2
R1
R2
R4
R5
R6
R7
R3 R8 RA
RB
R9
R10
ZD1
Description
Universal high brightness LED
driver
1A 1KV diode tRR=1.8µs
Ultra-fast-recovery diode 3A
600V tRR =50ns
1A, 600V bridge rectifier
15µF 450V electrolytic capacitor
+/-20% 1000hrs @ 105C
OMIT
4.7µF 50V electrolytic capacitor
+/-20% 1000hrs @ 105C
10µF 450V electrolytic capacitor
+/-20% 1000hrs @ 105C, 10mm
diameter
100nF, 275VAC, Film, X2
10Ohm 1W fusible resistor +/200ppm
Link with 22 to 26 SWG tinned
copper wire
6.8mH inductor +/-10% 290mA
radial
22mH or 30mH common mode
inductor, 8mm height
3.3mH inductor +/-10% 420mA
radial
275V, 21J, 9mm, Radial
Wire link
N-ch 600V MOSFET 3.2A,
Qg(max)= 16nC
NOT FITTED
10R 3W wirewound resistor, +/50ppm/C, +/-1%
3K 0.25W resistor +/-5%
0R 0.125W resistor +/-5%
1R2 0.25W +/-1%
2R7 0.25W +/-1%
100R 0.25W +/-1%
NOT FITTED
330K 0.25W resistor +/-1%
10R 0.25W +/-5%
0R 0.25W +/-5%
P/N
AL9910A
Package
SO8
Manufacturer
Diodes Inc
S1M-13-F
SF30JG-B
SMA
DO201AD
Diodes Inc
Diodes Inc
DF06S
EEUED2W150
400KXW27M10X30
UCY2G150MPD
DF-S
5mm pitch
Diodes Inc
Panasonic
Rubycon
Nichicon
ECE-A1HKG4R7
1206
1.5mm pitch
Panasonic
EEUEE2W100U
5mm pitch
Panasonic
ECQU2A104ML
15mm pitch
Panasonic
NFR0100001009JR5
00
Through-hole
axial
Vishay
19R685C
6mm pitch
Murata
B82791G2351N001
B82791G2301N001
19R335C
6mm pitch
EPCOS
EPCOS
Murata
B72207S0271K101
5mm pitch
EPCOS
SPB03N60S5
TO263
Infineon
UB3C-10RF1
Any
Any
Any
Any
Any
Any
Any
Any
SOT23-6
Through-hole
axial
1206
0805
1206
1206
1206
1206
1206
1206
1206
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5
Riedon
Any
Any
Any
Any
Any
Any
Any
Any
AL9910EV5
PERFORMANCE
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AL9910EV5
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AL9910EV5
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