HV816DB2 User Guide

Supertex inc.
HV816DB2
High Brightness 10in2
EL Lamp Driver Demoboard
General Description
The Supertex HV816DB2 is a high brightness demoboard
with the circuitry to drive a 10in2 EL lamp using the HV816 in
a 4x4 QFN-16 package.
Simply connect the board to a power supply and an EL lamp
as shown in the circuit schematic on the following page.
The HV816DB2 circuit has been optimized to drive an EL
lamp size of 10in2. For different EL frequencies or smaller
EL lamps sizes, the demoboard can be re-optimized by
changing some of the component values.
The output voltage is typically ±180V for high lamp
brightness, using a single supply input voltage of 5.0V. An
external N-channel MOSFET, Supertex TN2425 is used to
boost the output voltage to a nominal value of 180V with an
input voltage of 5.0V.
RSLEW resistor, the discharge rate will increase, which will
reduce audible noise but will also reduce brightness. RSLEW
can be set to a value between 100kΩ and 500kΩ with 100kΩ
for maximum brightness.
The HV816DB2 has the provision to set the EL lamp frequency
using the resistor REL on the board or by an external clock
input at the SEL pin. To use an external clock input, the REL
resistor should be removed and the REL-Osc pin should be
connected to GND.
Specifications
VDD input voltage
2.7 to 5.5V
VIN inductor supply voltage
4.5 to 5.0V
Typical supply current
For split supply applications, the diode BAS20 between VIN
and VDD has to be removed so separate supplies can be
used for VIN and VDD.
Lamp size
The discharge rate on the output for EL lamp can be adjusted
to minimize audible noise. By increasing the value of the
Board dimensions
150mA
10in2
Lamp frequency
190Hz
Converter frequency
150kHz
27mm x 27mm
Board Layout and Connection Diagram
D1
M1
LX
+
5.0V
-
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A061013
1.5 to
5.0V
0V
D2 R
SW
CSW
REL
CFEL
CIN
CS
CG
EL Lamp
RREG CDD RSLEW
Supertex inc.
www.supertex.com
HV816DB2
Connections:
EN, Input
A CMOS logic input which enables/disables the lamp driver.
A logic high (1.5V to VDD) enables the driver and a logic low
(0 to 0.2V) disables the driver.
VIN, Input
Inductor input voltage. Single supply can be used for VIN and
VDD or separate supplies can be used. If separate supplies
are used, the diode BAS20 between VIN and VDD has to be
removed. The input range for VIN is 4.5 to 5.0V.
SEL, Input
CMOS logic input to set the EL frequency. To use this pin, the
REL-Osc pin should be connected to GND. The frequency
input at this pin should be 4x the desired output frequency.
An external CLK signal can be used for this input. If this pin
is not used, it should be connected to ground.
VDD, Input
Device input voltage.Single supply can be used for VIN and
VDD or separate supplies can be used. If separate supplies
are used, the diode BAS20 between VIN and VDD has to be
removed. The input range for VDD is 2.7 to 5.5V.
VA and VB Outputs
VA and VB are for EL Lamp connections. They should be
connected to an EL lamp. Polarity is irrevelant.
GND
Device Ground. Connect to power supply ground.
HV816DB2 Circuit Schematic
VIN = 5.0V
CIN
100µF
D2
BAS20
6
14
RSW = 590kΩ 1
CSW
100nF
REL = 1.0MΩ
CFEL
100nF
2
4
RREG
100kΩ
5
9
EN = 1.5V to VDD
LX
D1
ES1D
M1
TN2425N8
CG
100nF
16
CDD
100µF
LX
LPS5030-473ML
VDRIVE
CS
3.3nF
200V
NPO
15
GATE
VDD
RSW-Osc
REL-Osc
CS
U1
HV816K6-G
VA
VB
VREG
SEL
VOUT
EN
GND
HVGND
13 Backside
7
Slug
12
11
10
EL Lamp
3
RSLEW-OUT
8
RSLEW
100kΩ
Note:
CIN can be in the range of 47 to 100µF.
CDD can be in the range of 47 to 100µF.
Typical Performance
VDD = VIN
IIN
VCS
fEL
Lamp Brightness
(V)
(mA)
(VPEAK)
(Hz)
ft-lm
cd/m2
5.0
150
190
190
15
50
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2
Supertex inc.
www.supertex.com
HV816DB2
Typical Performance
Ref
Description
Package
Manufacturer
Part Number
---
Coilcraft
LPS5030-473ML
LX
47µH Inductor
CS
3.3nF, 200V, NPO ceramic chip capacitor
1206
Any
---
RSW
1% 590kΩ chip resistor
0805
Any
---
REL
1% 1.0MΩ chip resistor
0805
Any
---
RREG
1% 100kΩ chip resistor
0805
Any
---
RSLEW
1% 100kΩ chip resistor
0805
Any
---
SOT-89
Supertex Inc.
TN2425N8-G
M1
200V, 3.5Ω N-channel MOSFET
CIN
100µF 6.3V ceramic chip capacitor
1206
Any
---
CDD
100µF 6.3V ceramic chip capacitor
1206
Any
---
CG
100nF 10V ceramic chip capacitor
0805
Any
---
CSW
100nF, 10V ceramic chip capacitor
0805
Any
---
CFEL
100nF, 10V ceramic chip capacitor
0805
Any
---
D1
1.0A surface mount super fast diode
SMA
Diodes Inc.
ES1D
D2
High voltage switching diode
SOD-323
ON Semi
BAS20HT1
U1
EL Driver IC
16-Lead (4x4) QFN
Supertex Inc.
HV816K6-G
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” Supertex inc. 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 and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)
Supertex inc.
©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Doc.# DSDB-HV816DB2
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3
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com