Microchip HV9930DB1 Handleiding

Microchip Niet gecategoriseerd HV9930DB1

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Supertex inc.
Supertex inc.
www.supertex.com
HV9930DB1
Doc.# DSDB-HV9930DB1
A032913
General Description
The HV9930DB1 is an LED driver demoboard capable of
driving up to 7 1-watt LEDs in series from an automotive
input of 9 - 16VDC. The demoboard uses Supertex’s
HV9930 in a boost-buck topology. The converter operates
at frequencies in excess of 300kHz and has excellent
output current regulation over the input voltage range. It
can also withstand transients up to 42V and operate down
to 6V input. The converter is also protected against open
LED and output short circuit conditions. Protection against
reverse polarity up to 20V is also included.
Board Layout and Connection Diagram
High Bright LED Driver IC Demoboard
Meeting Automotive Requirements
Speciîšżcations
Parameter Value
Input voltage (steady state): 9.0VDC - 16VDC
Input voltage (transient): 42VDC
Output LED string voltage: 28V max
Output current: 350mA +/-5%
Output current ripple: 5% typical
Switching frequency:
300kHz (9.0V input)
430kHz (13.5V input)
500kHz (16.0V input)
Efîšżciency: 80% (at 13.5V input)
Open LED protection: Included; clamps output
voltage at 33V
Output short circuit protection: Included; limits current at
350mA
Reverse polarity protection: -20V max
Input current limit: 1.9A
PWM dimming frequency: Up to 1.0kHz
Conducted EMI: Meets SAE J1113
conducted EMI standards
Connections:
Input - The input is connected between the terminals of
connector J1 as shown in the Connection Diagram.
Output - The output is connected between the terminals of
connector J2 as shown.
Enable/PWM Dimming:
To just enable the board, short pins 1 and 2 of connector J3
as shown. For PWM dimming, connect the external push-pull
square wave source between terminals 1 and 3 of connector
J3 as shown by the dotted lines.
Note:
During PWM dimming, pin 2 of connector J3 should be left
open. Also, the PWM signal must have the proper polarity
with the positive connected to pin 1 of J3. Note that pin 3
of J3 is internally connected to the return path of the input
voltage.
Actual Size: 2.25” x 1.25”
+
PWM
Dimming
Enable
+
_
+
_
V
IN
+
-
2
HV9930DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9930DB1
A032913
Testing the Demo Board
Normal Operation: Connect the input source and the output
LEDs as shown in the Connection Diagram and enable the
board. The LEDs will glow with a steady intensity. Connect-
ing an ammeter in series with the LEDs will allow measure-
ment of the LED current. The current will be 350mA +/- 5%.
Open LED test: Connect a voltmeter across the output ter-
minals of the HV9930DB1. Start the demoboard normally,
and once the LED current reaches steady state, unplug one
end of the LED string from the demoboard. The output volt-
age will rise to about 33V and stabilize.
Short Circuit Test: When the HV9930DB1 is operating in
steady state, connect a jumper across the terminals of the
LED string. Notice that the switching frequency drops, but
the average output current remains the same.
PWM Dimming: With the input voltage to the board discon-
nected, apply a TTL compatible, push-pull square wave sig-
nal between PWMD and GND terminals of connector J3 as
shown in the Connection Diagram. Turn the input voltage
back on and adjust the duty cycle and / or frequency of the
PWM dimming signal. The output current will track the PWM
dimming signal. Note that although the converter operates
perfectly well at 1.0kHz PWM dimming frequency, the best
PWM dimming ratios can be obtained at lower frequencies
like 100 or 200Hz
Typical Results
Fig. 1 shows the efîšżciency plot for the HV9930DB1 over the
input voltage range. The converter has efîšżciencies greater
than 80% over 13V input. Note that these measurements
do not include the 0.3 - 0.5W loss in the reverse blocking
diode.
Fig. 2 shows the variation of the switching frequency over
the input votage range. The frequency varies from 300kHz
to 500kHz over the entire input voltage range and avoids the
restricted frequency band of 150kHz to 300kHz and the AM
band greater than 530kHz. This makes it easier to meet the
conducted and radiated EMI speciîšżcations for the automo-
tive industry.
Fig.3 shows the output current variation over the input volt-
age range. The LED current has a variation of about 2.0mA
over the entire voltage range.
Fig. 1 Efficiency vs. Input ltageVo
70
72
74
76
78
80
82
84
Input ltage (V)Vo
Efficiency (%)
8 10 12 14 1
6 1
8
300
350
400
450
500
8 10 12 14 1
6 1
8
Input ltage (V)Vo
Switching Frequency
(kHz)
Fig.2 Switching Frequency vs. Input ltageVo
348.0
348.5
349.0
349.5
350.0
350.5
8 10 12 14 1
6 1
8
Input ltage (V)Vo
Outp t (mut Curren A)
Fig. 3 Output Current vs. Input ltageVo
3
HV9930DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9930DB1
A032913
The waveforms in Fig.4 show the drain voltage of the FET
(channel 1 (blue); 10V/div) and the LED current (channel 4
(green); 100mA/div) at three different operating conditions
– 9.0V in, 13.5V in and 16V in.
Fig. 5 shows the operation of the converter during cold crank
conditions as the input voltage decreases from 13.5V to
6V and increases back to 13.5V. In these cases, the input
current reaches the limit set and the output current drops
correspondingly. Thus, the LEDs continue to glow, but with
reduced intensity. Once the voltage ramps back up, the out-
put current goes back to its normal value and the converter
comes out of the input current limit.
Fig.6 shows the LED current during an input step change
from 13.5 to 42V and back to 13.5V (similar to a clamped
load dump). It can be seen that the LED current drops briey
when the input voltage jumps, but there are no overshoots.
(a)
(b)
(c)
Fig. 4. Steady State veformsWa
(a): 9.0V in; (b): 13.5V in; (c): 16V in
Fig. 5. Cold Crank Operation
Channel 1 (blue): Input voltage (10V/div)
Channel 3 (pink): Input current (1A/div)
Channel 4 (green): LED current; 100mA/div
Fig. 6 LED current during step changes
in the input voltage
Channel 1(blue): Input voltage (10V/div)
Channel 4 (green): LED current (100mA/div)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV9930DB1

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