Microchip HV9931DB1 Manual

Microchip Ikke kategoriseret HV9931DB1

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Side 1/14
Supertex inc.
Supertex inc.
www.supertex.com
HV9931DB1
Doc.# DSDB-HV9931DB1
A032713
The HV9931 LED driver is primarily targeted at low to
medium power LED lighting applications where galvanic
isolation of the LED string is not an essential requirement.
The driver provides near unity power factor and constant
current regulation using a two stage topology driven by
a single MOSFET and control IC. Triac dimming of this
design is possible with the addition of some components for
preloading and inrush current shaping.
The DB1 and DB2 Demoboards were designed for a xed
string current of 350mA and a string voltage of 40V for a load
power of about 14W. The boards will regulate current for an
output voltage down to 0V.
Nominal input voltage for the DB1 is 120VAC, for the DB2
230VAC. Design for universal input (85 to 265VAC) is by
all means possible but does increase cost and size while
lowering efciency.
The input EMI lter was designed to suppress the differential
mode switching noise to meet CISPR15 requirements.
No specic components were added to suppress currents
of common mode nature. Common mode current can be
controlled in many ways to satisfy CISPR 15 requirements.
The board is tted with a number of optional circuits; a
schematic of a simplied driver is given as well. The circuits
featured are output current soft start and protections from
line overvoltage, load overvoltage and open circuit. The
driver is inherently short circuit proof by virtue of the peak
current regulation method.
Board Layout and Connections
LED Driver Demoboard
Input 120VAC // Output 350mA, 40V (14W)
Specications
Input voltage: 100VRMS to 135VRMS, 60Hz
Output voltage: 0 to 40V
Output current: 350mA +/-5%
Output power: 14W, Max
Power factor 98%
Total harmonic distortion EN61000-3-2 Class C
EMI limits CISPR 15 (see text)
Efciency 83%
Output current ripple 30%PP
Input overvoltage
protection 140VRMS, Latching
Output overvoltage
protection 43V, Latching
Switching frequency 73kHz
Dimensions: 3.5” x 3.0” x 1.25”
General Description
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Supertex inc.
www.supertex.com
HV9931DB1
Doc.# DSDB-HV9931DB1
A032713
Step 1.
Carefully inspect the board for shipping damage, loose
components, etc, before making connections.
Step 2.
Attach the board to the line and load as shown in the diagram.
Be sure to check for correct polarity when connecting the
LED string to avoid damage to the string. The board is short
circuit and open circuit proof. The LED string voltage can
be anything between zero and 40V, though performance will
suffer when the string voltage is substantially lower than the
target of 40V. See the typical performance graphs.
Step 3.
Energize the mains supply. The board can be connected to
mains directly. Alternatively voltage can be raised gradually
from zero to full line voltage with the aid of an adjustable AC
supply such as a Variac or a programmable AC source.
Principles of Operation
The HV9931 topology can be viewed as a series connection
of two basic power supply topologies, (1) a buck-boost
stage as rst or input stage, for purpose of converting AC
line power into a source of DC power, commonly known as
the DC bus, having sufcient capacitive energy storage to
maintain the bus voltage more or less constant throughout
the AC line cycle, and (2) a buck stage as second or output
stage for powering the LED string, stepping down the DC
bus voltage to the LED string voltage in order to produce a
steady LED string current.
The output or buck stage is designed for operation in
continuous conduction mode (CCM), operating with about 20
to 30% inductor current ripple. This amount of ripple serves
the needs of the HV9931 peak current controller which relies
on a sloping inductor current for setting ON time, and is of an
acceptable level to high brightness LEDs. Duty cycle is more
or less constant throughout the line cycle as the DC bus
voltage and LED string voltage are more or less constant
as well. Duty cycle and bus voltage do adjust in response to
changes in line or load voltage but are otherwise constant
over the course of a line cycle. With the HV9931, OFF time is
xed by design, being programmed by an external resistor,
whereas ON time adjusts to a more or less constant value,
being under control of the HV9931 peak current regulator.
The input or buck-boost stage is designed for operation
in discontinuous conduction mode (DCM) throughout the
range of line and load voltage anticipated. This can be
accomplished by making the input inductor sufciently small.
A well known property of the DCM buck-boost stage, when
operated with constant ON time and constant OFF time, is
that input current is proportional to input voltage, whether
in peak value or average value. This results in sinusoidal
input current when the input voltage is sinusoidal, thereby
giving unity power factor operation when operating from the
rectied AC line voltage.
When operated in the anticipated range of line and load
voltage, the MOSFET ON time will be under control of the
output stage current controller, which turns the MOSFET
off when sensing that the output inductor current has
reached the desired peak current level as programmed by
a resistive divider at the CS2 pin. Under certain abnormal
circumstances such as initial run-up and line undervoltage,
which both could lead to the draw of abnormally high line
current, ON time is further curtailed by the action of the CS1
comparator, which monitors the input stage inductor current
against a threshold. This threshold can be a simple DC level
or be shaped in time as is performed on the Demoboard. In
particular, when shaping the CS1 threshold with the shape of
the rectied AC line input voltage waveform, the line current
will be bounded by a more or less sinusoidal line current
envelope which results in sinusoidal input current for low line
and other abnormal conditions.
The design exercise of an HV9931 LED driver revolves
around establishing component values for (1) the input and
Connection Instructions
Warning!
Working with this board can cause serious bodily harm or
death. Connecting the board to a source of line voltage will
result in the presence of hazardous voltage throughout the
system including the LED load.
The board should only be handled by persons well aware of
the dangers involved with working on live electrical equip-
ment. Extreme care should be taken to protect against elec-
tric shock. Disconnect the board before attempting to make
any changes to the system conguration. Always work with
another person nearby who can offer assistance in case of
an emergency. Wear safety glasses for eye protection.
Special Note:
The electrolytic capacitor carries a hazardous voltage for an
extended time after the board is disconnected. The board
includes a 1MΩ resistor placed across the electrolytic ca-
pacitor which will slowly discharge the capacitor after dis-
connection from line voltage. The voltage will fall more or
less exponentially to zero with a time constant of about 100
seconds. Check the capacitor voltage before handling the
board.

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: HV9931DB1

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