HV9930DB1 Supertex, HV9930DB1 Datasheet - Page 5

• Manufacturer Part Number: HV9930DB1
• Description: LED Lighting Development Tools HV9930 Demo Board
• Manufacturer: Supertex

Specifications of HV9930DB1

• Product Category: LED Lighting Development Tools
• Product: Demonstration Boards
• Core: HV9930
• Operating Supply Voltage: 9 V to 16 V
• Factory Pack Quantity: 1
• For Use With: 7 - 1 W LEDs

Fig. 9 shows the rise and fall times of the output current dur-
ing PWM dimming. The converter has nearly symmetric rise
and fall times of about 25µs. These rise and fall times can
be reduced (if desired) by reducing the output capacitance
C10. However, this will lead to increased ripple in the output
current.
Table 1. Conducted EMI Measurements
Channel 1 (blue): PWM Dimming Input Signal (2V/div)
Fig. 9. PWM Dimming rise and fall times
Frequency Range
Channel 4 (Green): LED current (100mA/div)
150 - 300
530 - 2.0
5.9 - 6.2
30 - 54z
70 - 108
Supertex inc.
(kHz)
(a): rise time
(b): fall time
Conducted EMI Limit for
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
(narrowband)
(narrowband)
(narrowband)
(broadband)
(broadband)
Class 3
(dBµV)
70
50
45
65
49
5
Conducted EMI Tests on the
HV9930DB1
In preliminary tests conducted on the demo board, the board
meets SAE J1113 Class 3 conducted EMI standards without
the need for any input filters (other than the input capacitors
already included). This is a result of the combination of the
continuous input current and a localized switching loop (Q1
– C1 – D3).
Table 1 details the conducted EMI limit as per SAE J1113
and the maximum conducted EMI obtained from measure-
ments on the board. The table also lists the Class of the SAE
standard the board meets in each frequency range.
The conducted EMI plots for the HV9930DB1 obtained at
an input voltage of 13.5V and an LED string voltage of 27V
(output current is 350mA) are given in the Appendix.
Conducted EMI by
HV9930DB1
●
(dBµV)
40
48
29
54
47
Tel: [phone]
●
www.supertex.com
Class as per SAE J1113
HV9930DB1
Class 5
Class 3
Class 5
Class 4
Class 3