HV853
High Voltage, Low Noise,
Inductorless EL Lamp Driver
Features
►
No external components required when using an
external EL clock frequency
►
Audible noise reduction with improved EMI
►
EL frequency can be set by an external resistor
►
DC to AC converter
►
Drives up to 5.3nF (approx. 1.5in
2
lamp) load
►
Output voltage regulation
►
Enable function
►
EL Lamp dimming
►
Available in 10-Lead DFN and 8-Lead MSOP
packages
General Description
The Supertex HV853 is a high voltage, low noise EL
(electroluminescent) lamp driver. It is the low noise version of
the HV852 with improved EMI performance, operating over an
input voltage range of 3.2V to 5.0V. It is designed to drive EL
lamps of up to 1.5in
2
, with capacitive values up to 5.3nF. The
HV853 converts a low voltage DC input to a high voltage AC
output across an EL lamp. A nominal regulated output voltage
of ±80V is applied to the EL lamp. It uses a charge pump
scheme to boost the input voltage eliminating the need for an
external inductor, diode, and high voltage capacitor commonly
found in conventional topologies.
The charge pump circuit discharges its energy into an EL lamp
through a high voltage H-bridge. Once the voltage reaches
its regulated limit, it is turned off to conserve power. The EL
lamp is then discharged to ground and the H-bridge changes
state to allow the charge pump to charge the EL lamp in the
opposite direction.
The EL lamp frequency can be set either by an external
resistor R
EL
or by applying an external clock where the clock
frequency is divided by 128 to set the EL lamp frequency.
Applications
►
Cellular phone keypad
►
Watches
►
Small handheld wireless devices
►
MP3 Players
Typical Application Circuits
V
DD
= ON
GND = OFF
+
V
DD
= ON
GND = OFF
1
C
DD
R
EL
2
3
4
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
V
DD
-
EL
LAMP
+
1
C
DD
2
3
4
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
V
DD
-
EL
LAMP
V
DD
V
DD
GND
HV853MG
EL Lamp Frequency set by R
EL
HV853MG
EL Lamp Frequency set by External Clock
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
HV853
Ordering Information
Package Options
DEVICE
HV853
3.00x3.00mm body
0.80mm height (max)
0.50mm pitch
Pin Configurations
3.00x3.00mm body
1.10mm height (max)
0.65mm pitch
10-Lead DFN
8-Lead MSOP
VDD
1
REL
EN
CLKIN
2
3
10
VA
9
VB
VDD
1
REL
2
EN
3
CLKIN
4
8
VA
7
VB
6
GND
5
CLKEN
8
GND
7
GND
6
CLKEN
4
5
HV853K7-G
HV853MG-G
NC
-G indicates package is RoHS compliant (‘Green’)
(top View)
Note:
Pads are at the bottom of the package.
Center heat slug should be connected to
GND or left floating.
10-Lead DFN (K7)
8-Lead MSOP (MG)
(top view)
Product Marking
Absolute Maximum Ratings
Parameter
V
DD
, supply voltage
Storage temperature
Power dissipation (10-Lead DFN)
Power dissipation (8-Lead MSOP)
Value
-0.5V to 6.5V
-65°C to +150°C
1.6W
300mW
Top Marking
H853
YWLL
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
10-Lead DFN (K7)
H853
LLLL
Bottom Marking
Absolute Maximum Ratings are those values beyond which damage to
the device may occur. Functional operation under these conditions is not
implied. Continuous operation of the device at the absolute rating level
may affect device reliability. All voltages are referenced to device ground.
YYWW
L = Lot Number
YY = Year Sealed
WW = Week Sealed
= “Green” Packaging
8-Lead MSOP(MG)
Recommended Operating Conditions
Sym
V
DD
f
EL
C
load
T
A
Parameter
Input voltage
EL lamp frequency
EL lamp capacitance
Operating temperature
Min
3.2
50
0
-25
Typ
-
-
-
-
Max
5.0
500
5.3
+85
Units
V
Hz
nF
O
Conditions
---
---
---
---
C
Electrical Characteristics
Sym
I
DDQ
V
A
or V
B
V
A
-V
B
I
DD
V
A
or V
B
V
A
-V
B
f
EL
Parameter
Quiescent current
Peak output voltage
(Over recommended operating conditions unless otherwise specified, T
A
= 25ºC)
Min
-
68
136
-
68
136
240
Typ
-
80
160
15
80
160
280
Max
150
92
184
30
92
184
320
Units
nA
V
V
mA
V
V
Hz
Conditions
EN = 0V
No load
See Figure 1
V
DD
= 3.5V
R
EL
= 1.5MΩ
Load = 3.3nF + 1.0kΩ
Peak to peak output voltage
Operating current
Peak output voltage
Peak to peak output voltage
EL lamp frequency
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
2
HV853
Electrical Characteristics
(cont.)
Sym
t
rout
t
fout
V
IL
V
IH
I
IL
I
IH
EN
rise
EN
fall
C
in
Parameter
Output voltage rise time
Output voltage fall time
Input logic low voltage
Input logic high voltage
Input logic low current
Input logic high current
Enable input rise time (for delay turn off)
Enable input fall time (for delay turn off)
Logic input capacitance
(Over recommended operating conditions unless otherwise specified, T
A
= 25ºC)
Min
-
150
0
2.0
-
-
0.01
10µ
-
Typ
450
-
-
-
-
-
-
-
-
Max
-
-
0.5
V
DD
1.0
1.0
10
5.0
10
Units
µs
µs
V
V
µA
µA
ms
s
pF
Conditions
1.0in
2
lamp
0V to 90% of final value
90% to 10% of final value
---
---
---
---
Using external R-C circuit,
see Figure 2
---
Logic Inputs
Typical Output Waveform
Functional Block Diagram
VDD
EN
V
DD
Capacitor
Charge
Pump Circuit
VA
V
SENSE
High
Voltage
Level
Trans-
lators
Feedback
CLKIN
CLKEN
V
DD
EL
Oscillator
VB
REL
MOSFET
Full Bridge
GND
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
3
HV853
Typical Performance
Load
(The following was the observed performance when driving a 1.0in
2
green lamp)
(MΩ)
R
EL
V
DD
(V)
(mA)
I
DD
V
A
-V
B
(V)
(Hz)
f
EL
3.2
3.5
3.3nF + 1.0kΩ
1.5
3.8
4.2
5.0
13.1
12.9
12.7
12.5
12.3
158
158
158
158
158
294
Figure 1: Typical Application
+
1
V
DD
-
C
DD
R
EL
2
3
4
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
EL
Lamp
GND = OFF
V
DD
= ON
HV853MG
Figure 2: Push Button Turn on with Delay Turn off
1
+
V
DD
Push Button
Turn On
C
DD
C
R
EL
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
2
3
4
EL
Lamp
-
R
HV853MG
RC time constant
will set Turn OFF
Delay time
Figure 3: Independent Programmable Output Frequency (f
EL
)
+
V
DD
-
V
DD
= ON
GND = OFF
V
DD
GND
Note: f
EL
= f
CLK
/128
C
DD
1
2
3
4
VDD
REL
EN
CLKIN
VA
VB
GND
CLKEN
8
7
6
5
EL
Lamp
V
DD
HV853MG
f
CLK
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
4
HV853
EL Lamp Dimming Using PWM
EL lamp dimming can be achieved by applying a PWM signal to the ENABLE pin. This is done by pulse skipping the out-
put pulses. The PWM frequency should be kept below the EL frequency but above 50Hz to avoid flickering.
Figure 4: PWM Dimming Circuit
V
DD
-
PWM
Signal
V
DD
GND
+
C
DD
R
EL
1
VDD
2
REL
3
EN
4
CLKIN
VA
8
VB
7
GND
6
CLKEN
5
EL Lamp
HV853MG
Pin Descriptions: 10-Lead DFN (K7) / 8-Lead MSOP (MG)
K7
Pin #
1
1
MG
Pin
Name
VDD
Description
Input supply voltage pin.
An external resistor to VDD will set the EL lamp frequency. The EL frequency is inversely
proportional to the R
EL
resistor value. A 1.5MΩ resistor would provide a nominal lamp fre-
quency of 280Hz
f
EL
= (1.5MΩ)(280Hz) / (R
EL
)
When using an external clock to set the EL lamp frequency, the REL pin should be con-
nected to ground.
3
3
EN
Enable input pin. Logic high will turn the device on. An external R-C circuit can be added for
a delayed turn off.
Logic input pin. An external logic clock applied to this pin can be used to set the EL lamp
frequency (see Figure 3). The EL lamp frequency is the external clock frequency divided by
128. This is useful for applications requiring the EL lamp to be synchronized to a system
clock. Connect to ground when not in use.
No connect.
Logic input pin. Logic high will cause the EL lamp frequency to be set by the CLKIN input.
Logic low will cause the EL lamp frequency to be set by the external R
EL
resistor.
IC ground pin.
EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
EL lamp driver output pin. The EL lamp is connected across VA and VB terminals.
2
2
REL
4
5
6
7,8
9
10
4
-
5
6
7
8
CLKIN
NC
CLKEN
GND
VB
VA
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
●
www.supertex.com
5
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