HV9821DB2 datasheet, PDF - EEWORLD Datasheet

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HV9821DB2: Descriptionled lighting development tools 20ma, led driver demo board; CategoryDevelopment board/suite/development tools; File Size905KB，4 Pages; ManufacturerSupertex; Environmental Compliance

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HV9821DB2 Overview

led lighting development tools 20ma, led driver demo board

HV9821DB2 Parametric

Parameter Name	Attribute value
Manufacture	Supertex
Product Category	LED Lighting Development Tools
RoHS	Yes
Produc	Demonstration Boards
For Use With	HV9821
Core	HV9821
Operating Supply Voltage	10 VAC to 265 VAC

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Supertex inc.

20mA 10VDC/265VAC

LED Driver Demoboard

HV9821DB2 Board Layout

Specifications

Parameter

Input voltage

Output current

Output voltage

EMI limits

Surge immunity

Power consumption

Load regulation

DC line regulation

Output ripple

Life time

Output short circuit protection

Output open circuit protection

Actual Board Size: 17mm x 26mm

HV9821DB2

Value

10~265VAC or 10-400VDC

20mA±15% at 230VAC

2.0~9.0V (1~3 white LEDs)

EN 55022 Level B

EN 61000-4-5 (1kV line-line)

1W(max) (3 LEDs, 265VAC)

<3%

<10% (20~400VDC)

<30% pk-pk

Non-Electrolytic

0.68” x 1.03” x 0.18”

17mm x 26mm x 4.6mm

Dimensions

General Description

The Supertex HV9821DB2 demonstrates the use of an

HV9821 control IC in a wide input voltage range LED

driver application targeted for industrial automation control

backlighting. Its patent pending circuit accepts DC voltage

input in the range of 10 to 400V, or AC input of 10 to 265VAC.

The board can power a single 20mA LED or a string of 20mA

LEDs up to 9.0V, consuming less then 1.0W of power under

all input line conditions.

Depending on the line and load condition, the circuit can

operate in three basic modes: 1) clamped buck converter

mode; 2) buck converter mode; 3) resistive ballast mode.

The clamped mode occurs when V

> V

, Zener voltage

of ZD1. The IC is programmed to operate at a variable

switching frequency determined by a fixed off time of 20.5µs.

In this mode, the voltage at OUT is limited to ~90V (Figure

4). However, the breakdown knee of ZD1 is only exceeded

during the first 300ns of each pulse, when the HV9821

is sourcing ~10mA from its VZ output. The IC further

transitions to a 100µA VZ current, and the OUT voltage

drops accordingly.

The buck converter mode (unclamped) occurs when V

< V

In this mode, the circuit operates as a basic buck converter

with the peak voltage at OUT equals V

The resistive ballast mode occurs when voltage at the RS

input with respect to OUT cannot reach the 0.50V threshold.

This occurs at input voltage that is not high enough to

develop the corresponding current in the LEDs due to series

resistance in the circuit (R

, R

of the HV9821, the DCR of

L1 and L

). In this case, the HV9821 operates in the fully-on

state with brief interruptions to replenish the charge in C

The frequency of these restart attempts is determined by the

capacitance value of C

An effort was made to satisfy the requirements of CISPR 11

(EN 55011) Level B, limits and methods of measurement of

radio disturbance characteristics of industrial, scientific and

medical (ISM) radio-frequency equipment.

The connection diagram details the hookup of the board to

the AC line. Note that the load is NOT galvanically isolated,

and that measurements to the board require measurement

techniques in common use with non-isolated off-line power

supplies (isolation transformers, differential probes, etc).

Doc.# DSDB-HV9821DB2

NR030413

Supertex inc.

www.supertex.com

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