Instrukcja obsługi Microchip HV9961
Microchip
Niesklasyfikowane
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 rectier 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 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 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 lter capacitor can accept the full rated rectied AC
line voltage.
Please, note that the demoboard is not CISPR15 compliant.
An additional input EMI 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
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | Niesklasyfikowane |
| Model: | HV9961 |
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