HV9925DB1 Supertex, HV9925DB1 Datasheet - Page 2

• Manufacturer Part Number: HV9925DB1
• Description: Power Management IC Development Tools PROGRAMMABLE-CURRENT LED LAMP DRIVER W/PWM DIMMING DEMOBOARD
• Manufacturer: Supertex

Specifications of HV9925DB1

• Product: Power Management Development Tools
• Tool Is For Evaluation Of: HV9925
• Description/function: LED Driver Demo Board
• Factory Pack Quantity: 1

Testing the HV9925DB1
Connect the LED string to the output terminals.
Check the polarity of the LED connection. The anode end
of the string should be connected to the positive output, and
the cathode should be connected to the negative output.
Connect the AC input to the input terminals. Apply the AC
voltage at the input terminals and the LED string should
start to glow. The HV9925DB1 will regulate constant 50mA
current in the LED. An ammeter can be connected in series
with the LED(s) to measure the output current.
Schematic Diagram
Typical Performance Characteristics
A C2
AC1
84.00
82.00
80.00
78.00
76.00
74.00
72.00
2
100, 1/4W
80
Fig. 1 Typical Efficiency at V
R1
Supertex inc.
1
90
4
Input AC Voltage, VAC
100
+
-
2
1
B1
DF06M
110
3
●
120
1235 Bordeaux Drive, Sunnyvale, CA 94089
1
2
OUT
130
PWMD
+ C
= 50V
GND
V
3.3µF
250V
DD
IN
1
140
RS
8.2
0.1uF
C
J1
DD
2
1
2
CS
2
Fig. 2 AC Line Regulation of LED Current at V
1
3
4
PWM Dimming HV9925DB1
Remove the jumper J1 and connect to an output of the
square-wave signal generator using an opto-isolator.
Note:
The HV9925DB1 circuit is not isolated from AC mains.
Connecting external devices to J1 without using opto-
isolators can be hazardous and may cause equipment
damage.
VDD
RSENSE
PWMD
U1
49.0
48.0
48.8
48.6
48.4
48.2
47.8
47.6
47.4
HV9925
80
●
GND
2
Tel: [phone]
90
DRAIN
DRAIN
DRAIN
Input AC Voltage, VAC
N/C
100
5
8
7
6
110
C
A
●
www.supertex.com
D1
US1G
1
120
22mH
L1
HV9925DB1
130
2
2
1
140
OUT
C
.01uF
= 50V
LED+
OUT
LED-