Microchip HV9967BDB1 Bruksanvisning

Microchip Inte kategoriserad HV9967BDB1

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Supertex inc.
Supertex inc.
www.supertex.com
HV9967BDB1
Doc.# DSDB-HV9967BDB1
B101613
General Description
The HV9967BDB1 demoboard is a high-brightness LED
driver designed to drive 4 LEDs in series at currents up to
350mA from a 20 - 60V DC input. The demoboard uses the
Supertex’s HV9967B in a buck conguration in a constant
off-time mode.
The HV9967BDB1 LED driver features tight regulation of the
LED current within a few milliamps over the entire range of
the input voltage (i.e. 20 - 60VDC). The LED current accuracy
is almost insensitive to the passive component tolerances,
such as the inductance or the timing resistor.
PWM dimming can be achieved by applying a pulse-width-
modulated square wave signal between the PWMD and
GND pins.
4W LED Driver Demoboard
with Accurate Average-Mode Constant Current Control
Connection Diagram
1. Connect the LED string between LED+ (Anode of
LED string) and LED- (Cathode of LED string).
2. Connect the PWMD terminal to the VDD terminal
to enable the LED driver if PWM dimming is not re-
quired.
3. Connect the input DC voltage between the VIN+
and VIN- terminals.
Connections
Parameter Specification
Input voltage 20 - 60 VDC
Output voltage 10 -15VDC (4 x LEDs)
Output current 350mA ± 5%
Output current ripple
20% pk-pk
(Typical, depending on
the type of LED)
Switching frequency Variable with constant
TOFF = 5µs ± 20%
Full load efciency Typical 80% minimum
Output short circuit protection Included, hiccup mode
Specifications
VLED (+)
VLED (-)
VIN (+) VIN (-) VDD PWMD GND
2
HV9967BDB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9967BDB1
B101613
Circuit Schematic
Typical Characteristics
XFF
RIPF
RYOF
TUGPUG
81
3
6
4
2
TV
CIPF
7
UY
W3
JX;;89
C4
1.0µF
100V
C3
1.0µF
100V
C1
1.0µF
16V
R2 1k0
R4 52k3 1%
R1
0R68
1/4W
TP1
TP2
J3
3
2
1
1
2
2
1
C2
4.7µF
25V
D1
B1100
L1
330µH
J1
J2
50
100
150
200
20 30 40 50 60
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HV9967BDB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9967BDB1
B101613
Normal Operation:
Figures 1-4 show the waveforms during normal operation at loading of 4 x LED in series at different input.
Figure 1: 20V Output
Figure 2: 30V Output
Channel 1 (Brown) : Drain-Source Voltage (10V/div)
Channel 4 (Green) : Output LED Current (50mA/div)
Time Scale : 5µs/div
Channel 1
Channel 1
Channel 4
Channel 4
Channel 1 (Brown) : Drain-Source Voltage (10V/div)
Channel 4 (Green) : Output LED Current (50mA/div)
Time Scale : 5µs/div

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: HV9967BDB1

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