HV9912DB1 Supertex, HV9912DB1 Datasheet

HV9912DB1

Manufacturer Part Number

HV9912DB1

Description

LED Lighting Development Kits HI BRIGHTNESS BOOST LED DRIVER DEMOBOARD

Manufacturer

Supertex

Datasheet

1.HV9912DB1.pdf (6 pages)

Specifications of HV9912DB1

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General Description

The HV9912DB1 is an LED driver demoboard capable of driving up

to 20 one-watt LEDs in series from an input of 21 - 27VDC. It uses

the Supertex HV9912 in a boost topology. The converter has very

good initial regulation (+/-5%) and excellent line and load regulation

over the entire input and output voltage range (<+/- 1%). The full

load efﬁciency of the converter is typically greater than 90%.

The HV9912DB1 is protected against open LED and output short

circuit conditions. It is also protected under input under-voltage

conditions by limiting the input current. It has an excellent PWM

dimming response, with typical rise and fall times less than 1.0μs,

which allows high PWM dimming ratios. The switching frequency of

the HV9912DB1 can be synchronized to other HV9912 boards or

to an external 200kHz clock by connecting the clock to the SYNC

pin of the HV9912DB1.

The HV9912DB1 features hiccup mode short circuit and open LED

protection. Upon detection of either fault condition, the IC shuts

down the driver and periodically attemps to restart until the fault

condition ends. The HV9912DB1 also features a built-in 500ns

blanking to prevent false tripping of the over-current comparator

due to parasitic capacitance spikes during PWM dimming.

Board Layout and Connection Diagram

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

PWMD and VDD of connector J3 as shown by the dashed

lines. To PWM dim the board, connect the external push-

pull waveform source between terminals PWMD and GND

of connector J3 as shown by the solid lines.

with 1:3000 Dimming Ratio and Hiccup Mode Protection

High Brightness Boost LED Driver Demoboard

Actual size: 64.0mm x 34.5mm

●

1235 Bordeaux Drive, Sunnyvale, CA 94089

SYNC - To synchronize two or more boards, connect the

SYNC pins of all the boards together. To synchronize the

HV9912DB1 to an external 200kHz clock, connect the clock

between the SYNC and GND pins of terminal J3.

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 3 of J3. Note that pin 4

of J3 is internally connected to the return path of the input

voltage.

Speciﬁcations

Parameter

Input voltage (steady state):

Output LED string voltage:

Output current:

Output current ripple:

Switching frequency:

Full load efﬁciency:

Open LED protection:

Output short circuit

protection:

Input under voltage

protection:

PWM dimming:

●

Tel: 408-222-8888

●

www.supertex.com

HV9912DB1

1:3000 dimming ratio

35V min - 80V max

Shuts down at 92V

93% (at 24V input)

350mA +/-5%

21 - 27VDC

10% typical

at 200Hz

Included

200kHz

Value

Related parts for HV9912DB1

HV9912DB1 Summary of contents

Page 1

... High Brightness Boost LED Driver Demoboard with 1:3000 Dimming Ratio and Hiccup Mode Protection General Description The HV9912DB1 is an LED driver demoboard capable of driving one-watt LEDs in series from an input 27VDC. It uses the Supertex HV9912 in a boost topology. The converter has very good initial regulation (+/-5%) and excellent line and load regulation over the entire input and output voltage range (< ...

Page 2

... LED current reaches steady state, unplug one end of the LED string from the demoboard. The output voltage will rise to about 92V and the HV9912DB1 will shut down. Once the LED string is reconnected, the driver will start regulating current. ...

Page 3

... HV9912DB1. In Fig. 8, the onset of the output short circuit is indicated by the ﬁrst . Once the output volt- spike in the LED current. At this point, the HV9912DB1 shuts DD down and the hiccup mode protection takes over. A constant current source charges the COMP pin to 5.0V and then an- other current source discharges ...

Page 4

... Fig. 9 shows the recovery of the HV9912DB1 from a short circuit condition. It can be seen that the LED current recov- ers normally with no overshoots. 6. PWM Dimming: The rise and fall transitions of the LED current during PWM dimming are shown in Figs. 10 and 11, PWM dimming input ...

Page 5

... Circuit Schematic: ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 5 HV9912DB1 ● Tel: 408-222-8888 ● www.supertex.com ...

Page 6

... SMD0805 Yageo SMD0805 Yageo SMD0805 Yageo SMD1206 Yageo SMD0805 Yageo SMD0805 Yageo SMD0805 Panasonic SO-16 Supertex 1235 Bordeaux Drive, Sunnyvale, CA 94089 6 HV9912DB1 Manufacturer’s Part Number C3225X7R1H225K B32522C1105J C2012X7R1C105K GRM219R71C104KA01D C2012C0G1H222J C2012C0G1H682J C2012X7R1H103K B1100-13 S2B-EH S4B-EH CDRH127/LDNP-221MC FDS3692 TN2510N8 RC0805FR-07866KL RC0805FR-07280KL ...

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