Microchip HV9961 Handleiding

Microchip Niet gecategoriseerd HV9961

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Supertex inc.
Supertex inc.
www.supertex.com
HV9961DB1
Doc.# DSDB-HV9961DB1
A032913
20-60V
350mA
90-265VAC
50/60Hz
0 -1.5V for LD function
or leave open
General Description
The HV9961 demoboard is a high-brightness LED driver
employing the patent-pending average-mode constant
current control scheme by Supertex Inc. The power
conversion stage of the HV9961DB1 consists of a diode
bridge rectiîš¿er followed by a buck converter operating with
xed off-time of 20µs.
The HV9961DB1 LED driver features tight regulation of the
LED current within a few milliamps over the entire range
of the input AC line and the output LED string voltage. The
LED current accuracy is almost insensitive to the passive
component tolerances, such as the output îš¿lter inductance
or the timing resistor. The accuracy of the LED current is
mainly determined by the internal 275mV ± 3% reference
voltage of the HV9961 control IC and by the external current
sense resistor tolerance. The output current can be adjusted
down to 60mA using an on-board potentiometer. However,
the accurate current control is only achieved with continuous
conduction of the îš¿lter inductor, i.e. when the LED current is
greater than the inductor ripple current amplitude.
(Note, that the linear dimming input of the HV9961 disables
switching, when its voltage falls below a 200V threshold.
Expect the LED driver to shut off when the LED current falls
below 50 ~ 55mA.)
PWM dimming can be achieved by applying a pulse-width-
modulated square wave signal between the PWMD and
GND pins.
The HV9961DB1 features protection from an output short
circuit condition. Open LED protection is inherent, since the
output îš¿lter capacitor can accept the full rated rectiîš¿ed AC
line voltage.
Please, note that the demoboard is not CISPR15 compliant.
An additional input EMI îš¿lter circuit is required to make the
board meet conducted electro-magnetic emission limits.
Also, note that:
NO SAFETY ISOLATION OF THE LED LOAD
FROM THE AC MAINS VOLTAGE IS PROVIDED!
21-Watt Universal AC LED Driver Demoboard with
Accurate Average-Mode Constant Current Control
Connection Diagram
WARNING!!!
Do not connect earth-grounded
test instruments. Doing so will
short the AC line, resulting in
damage to the instrument and/or
the HV9961DB1. Use oating
high voltage differential probes or
isolate the demoboard by using
an isolating transformer.
WARNING!!!
No galvanic isolation.
Dangerous voltages are
present when connected
to the AC line.
1. Connect the input AC voltage between the AC IN
terminals as shown in the connection diagram.
2. Connect the LED string between LED+ (anode of
LED string) and LED- (cathode of LED string).
3. Connect the PWMD terminal to the VDD terminal
using the jumper provided to enable the LED driver.
4. The current level can be adjusted by applying 0 -
1.5V between LD and GND. Leave LD oating to
use the internal current setting.
Connections
2
HV9961DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9961DB1
A032913
PWM Dimming
The HV9961DB1 is capable of being PWM dimmed by ap-
plying a square wave TTL compatible signal between PWMD
and GND terminals. However, since there is no galvanic iso-
lation on the board, care must be taken to prevent damage
to the PWM dimming source and/or the HV9961DB1. One
simple way is to isolate the LED driver from the AC line using
an isolation transformer. Another approach is to use an opto-
isolator to drive the PWMD pin as shown in the îš¿gure below.
5.0V
square
wave
signal
(<1.0kHz)
3.8kΩ
PWMD
VDD
Opto-isolator
(e.g. V-814 from Lite-On)LT
Speciîš¿cations
Parameter Value Condition
Input Voltage 90~265VAC, 50/60Hz ---
Output Voltage ---20~60V
Nominal Output Current ---350mA±4%
Output Current Ripple ±15%
(typical, depending on the type of LED) 120VAC, 60V/350mA
Full Load Efîš¿ciency 92% 120VAC, 60V/350mA
91% 240VAC, 60V/350mA
Power Factor 0.56 120VAC, 60V/350mA
0.50 240VAC, 60V/350mA
Max. Input Current 0.27A (RMS) 90VAC, 60V/350mA
Switching Frequency
(variable, TOFF = 20µs)
29kHz 120VAC, 60V/350mA
38kHz 240VAC, 60V/350mA
40kHz 120VAC, 20V/350mA
43kHz 240VAC, 20V/350mA
Open LED Protection YES Recovery upon power reset
Output Short Circuit Protection YES ---
Dimensions ---68.6mm X 49.6mm
3
HV9961DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9961DB1
A032913
60 110 160 210 260 310
LED Current (A)
AC Line Voltage (VAC)
Current Regulation vs. AC Line ltage Vo
75%
80%
85%
90%
95%
Efficiency (%)
AC Line Voltage (VAC)
Efficiency
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 10 20 30 40 50 60 70
LED Current, A
Output Voltage (V)
Output Short Circuit Response
10 20 30 40 50 60 70
Output ltage (V)Vo
Current Regulation vs. LED String Voltage
0.364
0.362
0.360
0.358
0.356
0.354
0.352
0.350
0.348
0.346
LED Current (A)
60 110 160 210 260 310
PWM Dimming Response Short Circuit Current
240VAC
120VAC
240 CVA
120VAC
20V
60V
ILED
PWMD
VIN = 240VAC
ILED
PWMD
VIN = 240VAC
240 CVA
120VAC
0.340
0.345
0.350
0.355
0.360
0.365
VO = 20V
VO
= 60V
240 CVA
120VAC
20V
60V
VO = 20V
VO
= 60V
0.370
Typical Characteristics

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9961

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