HV9911DB1 [ETC]

led驱动电源; LEDグランド


型号：	HV9911DB1
厂家：	ETC
描述：	led驱动电源 LEDグランド驱动
文件：	总7页 (文件大小：603K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Supertex inc.

HV9911DB1

High Brightness Boost LED Driver

with 1:3000 Dimming Ratio and Excellent Current Regulation

General Description

Speciﬁcations

Input Voltage (steady state):

Output LED string voltage:

Output current:

21V – 27V DC

35V min - 80V max

350mA +/-5%

10% typical

The HV9911DB1 is an LED driver capable of driving up to 20

one-watt LEDs in series from an input of 21 – 27V DC. The

demoboard uses Supertex’s HV9911 in a boost topology.

The converter has a 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%.

Output Current Ripple:

Switching Frequency:

Full Load Efﬁciency:

200kHz

93% (at 24V input)

Shuts down at 92V

The HV9911DB1 is also protected against open LED and

output short circuit conditions. It is also protected under input

undervoltage conditions by limiting the input current. It has

an excellent PWM dimming response, with typical rise and

fall times less than 2μs, which will allow high PWM dimming

ratios.

Open LED protection:

Output short circuit protection: Included

Input under voltage protection: Included

PWM Dimming:

1:3000 dimming ratio at 200Hz

TheswitchingfrequencyoftheHV9911DB1canbesynchronized

to other HV9911 boards or to an external 200kHz clock by

connecting the clock to the SYNC pin of the HV9911DB1.

Actual size: 64mm x 34.5mm

Board Layout and Connection Diagram

Connections:

Input: The input is connected between the terminals of connector Note: During PWM dimming, pin 2 of connector J3 should be left

J1 as shown in the Connection Diagram.

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

Output: The output is connected between the terminals of connected to the return path of the input voltage.

connector J2 as shown.

SYNC: To synchronize two or more boards, connect the SYNC pins

Enable/PWM Dimming: To just enable the board, short pins of all the boards together. To synchronize the HV9911DB1 to an

PWMD and V of connector J3 as shown by the dashed lines. external 200kHz clock, connect the clock between the SYNC and

To PWM dim t^Dh^De board, connect the external push-pull waveform GND pins of terminal J3.

source between terminals PWMD and GND of connector J3 as

shown by the solid lines.

A032006

Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: (408) 222-8888 FAX: (408) 222-4895 www.supertex.com

HV9911DB1

Testing The Demoboard:

Normal Operation: Connect the input source and the output LEDs Short Circuit Test: When the HV9911DB1 is operating in steady

as shown in the Connection Diagram and enable the board. The state, connect a jumper across the terminals of the LED string.

LEDs will glow with a steady intensity. Connecting an ammeter in Notice that the output current will immediately go to zero and the

series with the LEDs will allow measurement of the LED current. converter will shut down. To restart the HV9911DB1, recycle the

The current will be 350mA +/- 5%.

input power to the demoboard.

Current Regulation: With the input power to the converter PWM Dimming: With the input voltage to the board disconnected,

disconnected,changetheLEDstringvoltagewithinthespeciﬁcations apply a TTL compatible, push-pull square wave signal between

mentioned. The current output of the HV9911DB1 will remain very PWMD and GND terminals of connector J3 as shown in the

steady over the entire load range. Vary the input voltage while the Connection Diagram. Turn the input voltage back on and adjust

circuit is operational. The current will be regulated over the entire the duty cycle and / or frequency of the PWM dimming signal.

line range.

The output current will track the PWM dimming signal. Note that

although the converter operates perfectly well at 1kHz PWM

Open LED test: Connect a voltmeter across the output terminals of dimming frequency, the widest PWM dimming ratio can be obtained

the HV9911DB1. Start the demoboard normally and once the LED at lower frequencies like 100 or 200Hz.

current reaches steady state, unplug one end of the LED string from

the demoboard. The output voltage will rise to about 92V and then

the HV9911DB1 will shut down. To restart the converter, disconnect

and reconnect the input voltage (recycle the power to the board).

Typical Results:

1. Efﬁciency: The efﬁciency of the converter at various LED string 2. Current Regulation: Figs. 3 and 4 show the output current

voltages are shown in Fig.1 (measured at the nominal input volt- regulation vs. output voltage and input voltage respectively. The

age of 24V). Fig.2 shows the full load efﬁciency of the converter total current regulation (line and load combined) is found to be less

at varying input voltages. The minimum efﬁciency of 93% for the than 1%.

converter occurs at 21V input and full load output.

0.354

0.352

0.35

0.348

0.346

Output Voltage (V)

Fig. 1. Efficiency vs. Output Voltage

Fig. 3. Output Current vs. Output Voltage

0.354

0.352

0.35

0.348

0.346

Input Voltage (V)

Fig. 2. Efficiency vs. Input Voltage

Fig. 4. Output Current vs. Input Voltage

A032006

HV9911DB1

3. Input Under Voltage Protection: Input under voltage protec- 6. PWM Dimming: The rise and fall transitions of the LED current

tion is provided by limiting the input current at low input voltages. during PWM dimming are shown in Figs. 8 and 9, at output volt-

Fig. 5 shows the output and input currents at voltages less than the ages of 80V and 40V respectively. The timescale for all waveforms

minimum rated voltage. The LED current will decrease as the input is set at 5.0μs/div. The rise and fall times are less than 1.0μs in

voltage falls and the input current limits to about 1.4A. Note that each case. Thus, a PWM dimming ratio of 1:3000 is achievable at

the input current limit is not a hard limit as the slope compensation a PWM dimming frequency of 200Hz.

added to the peak current sense signal will allow a small change in

the input current with a decrease in the input voltage.

Input Under Voltage Behavior

0.4

0.3

0.2

0.1

1.6

1.4

1.2

Output Voltage

Output Current

Input Voltage (V), Sweep

Input Current Output Current

Fig. 7:Output Short Circuit Protection

(500ns/div)

Fig. 5. Input Under Voltage Behavior

4. Open LED Protection: Open LED protection for the circuit is

set at 92V. The waveforms in Fig. 6 show the output voltage, drain

voltage and output current during an open LED condition. The time

taken for the over voltage protection to shut the IC down will de-

pend on the size of the output capacitor.

5. Output Short Circuit Protection: Fig. 7 shows the waveforms

for output short circuit condition. The disconnect FET is turned off

in less than 300ns. The rise in the output current will depend on

the input voltage and the value of inductor L1. The same protec-

tion will also help in protecting the LEDs in case the output voltage

increases beyond the LED string voltage.

Output Voltage

LED Current

Drain Voltage of Q1

Fig. 6: Open LED Protection

(20μs/div)

A032006

HV9911DB1

PWM dimming input

Output Voltage

PWM dimming input

Output Voltage

LED Current

Fig. 8a: Rise time of LED Current at

80V output (5μs/div)

Fig. 8b: Fall time of LED Current at

80V output (5μs/div)

PWM dimming input

Output Voltage

PWM dimming input

Output Voltage

LED Current

Fig. 9a: Rise time of LED Current at

40V output (5μs/div)

Fig. 9b: Fall time of LED Current at

40V output (5μs/div)

A032006

HV9911DB1

Circuit Schematic:

A032006

HV9911DB1

Top Layer:

Bottom Layer:

Silk Screen:

A032006

HV9911DB1

Bill of Materials

Manufacturer’s Part

Number

Item # Quantity RefDes

Description

Package

Manufacturer

2 C1,C2

2 C4,C9

1 C5

2.2uF, 25V, X7R ceramic chip capacitor

1uF, 100V metal polyester capacitor

1uF, 16V X7R ceramic chip capacitor

0.1uF, 16V X7R ceramic chip capacitor

2.2nF, 5%, 50V C0G ceramic chip capacitor

6.8nF, 5%, 50V C0G ceramic chip capacitor

100V, 1A schottky diode

SMD1210

Radial

TDK Corp

EPCOS Inc

TDK Corp

Murata

C3225X7R1H225K

B32522C1105J

SMD0805

SMA

C2012X7R1C105K

GRM219R71C104KA01D

C2012C0G1H222J

C2012C0G1H682J

B1100-13

1 C6

1 C7

TDK Corp

Diodes Inc.

1 C8

1 D1

2 J1,J2

1 J3

Side Entry 2-pin male header

Side Entry 4-pin male header

220uH, 2A sat, 1.5A rms inductor

100V, 4.55A N-Channel MOSFET

100V, 1.5ohm N-Channel MOSFET

82.5k, 1%, 1/8W chip resistor

453k, 1%, 1/8W chip resistor

1.13k, 1%, 1/8W chip resistor

open

Thru-Hole

SMT

JST Sales Amer. S2B-EH

JST Sales Amer. S4B-EH

1 L1

Sumida

Fairchild

Supertex

Yageo

CDRH127/LDNP-221MC

1 Q1

1 Q2

1 R1

SO-8

FDS3692

SOT-89

TN2510N8

SMD0805

RC0805FR-0782K5L

RC0805FR-07453KL

RC0805FR-071K13L

1 R2

Yageo

1 R3

Yageo

1 R4

1 R5

1k, 1%, 1/8W chip resistor

SMD0805

SMD2010

SMD0805

SMD1206

SMD0805

Yageo

RC0805FR-071KL

WSL2010R1500FEA

RC0805FR-0720KL

RC0805FR-0717K4L

RC0805FR-077K87L

RC1206FR-071R24L

RC0805FR-0749K9L

RC0805FR-0716K2L

RC0805FR-078K66L

HV9911NG

1 R6

0.15, 1%, 1/2W chip resistor

20k, 1%, 1/8W chip resistor

Vishay/ Dale

Yageo

1 R7

1 R8

17.4k, 1%, 1/8W chip resistor

7.87k, 1%, 1/8W chip resistor

1.24, 1%, 1/4W chip resistor

49.9k, 1%, 1/8W chip resistor

16.2k, 1%, 1/8W chip resistor

8.66k, 1%, 1/8W chip resistor

Yageo

1 R9

Yageo

1 R10

1 R11

1 R12

1 R13

1 U1

Yageo

Switchmode LED Driver with High Current Accuracy SO-16

Supertex

Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell its products for use in such applications, unless it receives an adequate

"product liability indemnification insurance agreement". Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of the devices

determined defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest

product specifications, refer to the Supertex website: http//www.supertex.com.

Supertex inc.

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 222-8888 / FAX: (408) 222-4895

A032006

www.supertex.com

HV9911DB1 [ETC]

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