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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9919BDB1
B041914
HV9919BDB1
Single, High Current LED Driver Demoboard
Specications
The HV9919BDB1 demoboard is a high current LED
driver designed to drive one LED at 1.0A from a 9.0 -
16V DC input. The demoboard uses Supertex’s HV9919
hysteretic buck LED driver IC.
The HV9919BDB1 includes two PWM dimming modes.
The analog control of the PWM dimming mode allows
the user to dim the LED using a 0 - 2.0V analog signal
applied between the ADIM and GND pins (0V gives 0%
and 2.0V gives 100%). In this mode, the PWM dimming
frequency is set to 1kHz on the board. The digital control
of PWM dimming mode allows the user to dim the LEDs
using an external, TTL-compatible square wave source
applied between DIM and GND. In this case, the PWM
dimming frequency and duty ratio are set by the external
square wave source.
Parameter Value
Input voltage 9.0 - 16VDC (steady state)
40V max (transient)
Reverse polarity protection 60V (max)
Output voltage 2.0 - 5.0V
Output current 1.0A ± 5%
Output current ripple (@13.5V
input and 3.3V output) 16% (peak to peak)
Full load efciency
(@13.5V input) 84%
Open LED protection Yes
Output short circuit protection Yes
Dimensions 25.4mm X 25.4mm
General Description
Connection Diagram
Input Connection: Connect the input DC voltage between
VIN and GND terminals of connector J1 as shown in the
connection diagram.
Output Connection: Connect the LEDs between LED+
(anode of LED string) and LED- (cathode of LED string) of
connector J2.
PWM Dimming Connection:
1. If no PWM dimming is required, short DIM, VDD and
ADIM terminals of connector J3.
2. If dimming using an external PWM dimming source,
connect the PWM source between the DIM and GND
terminals of connector J3 and short terminals ADIM
and VDD. The recommended PWM dimming frequen-
cy is ≤1.0kHz.
3. If dimming using an external analog voltage source,
connect the source between the ADIM and GND ter-
minals of connector J3 and short terminals DIM and
VDD. The voltage range for control of the PWM dim-
ming is 0 - 2.0V.
Connections
Silk Screen (top)
2
HV9919BDB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9919BDB1
B041914
Typical Results
Fig. 1. Efciency vs. Input Voltage Plot Fig. 2. Line Regulation of LED Current Plot
Full Load Efficiency vs. Input eVoltag
84
84.2
84.4
84.6
84.8
85
8 10 12 14 16 18
Input Voltage (V)
Efficiency (%)
Line Regulation of LED Current
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
8 10 12 14 16 18
Input ltage (V)Vo
% change in LED Current
Fig. 3. Efciency vs. Load Voltage Plot Fig. 4. Load Regulation of LED Current Plot
Efficiency vs. Load Voltage (@13.5V input)
65
70
75
80
85
2 3
4 5
Load ag Volt e (V)
Efficiency (%)
Load Regulation of LED Current
-0.5
0
0.5
1
1.5
2345
Load Voltage (V)
% change in LED Current
Fig. 5. Switching Frequency vs. Input Voltage Plot Fig. 6. Switching Frequency vs. Load Voltage Plot
Switching Frequency vs. Input Voltage
( )Ful Lol ad
150
200
250
300
350
400
450
8 10 12 14 16 18
Input Voltage (V)
Swit inch g Frequency (kHz)
Switch y vsing Frequenc . Load Voltage
(@13.5V input)
150
200
250
300
350
400
450
2 3 4 5
Load Voltage (V)
Switching Frequency (kHz)
3
HV9919BDB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9919BDB1
B041914
Typical Waveforms (All waveforms are at 13.5V input and 3.3V LED Voltage unless otherwise noted)
Figure 7. Steady State Waveforms
Figure 8. Transient Response of the LED Current
Drain Voltage
LED Current
Input Voltage
LED Current
C1 (Yellow) : Drain Voltage (5V/div)
C4 (Green) : LED Current (500mA/div)
Time Scale : 1μs/div
C1 (Yellow) : Input Voltage (20V/div)
C4 (Green) : LED Current (500mA/div)
Time Scale : 20μs/div

Produktspecifikationer

Varumärke: Microchip
Kategori: Inte kategoriserad
Modell: HV9919BDB1

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