Lamp Driver. HV826 Datasheet

HV826 Driver. Datasheet pdf. Equivalent

Part HV826
Description High Voltage EL Lamp Driver
Feature HV826 High Voltage EL Lamp Driver IC Features ► 1.8V to 3.5V operating supply voltage ► DC to AC c.
Manufacture Supertex Inc
Datasheet
Download HV826 Datasheet




HV826
HV826
High Voltage EL Lamp Driver IC
Features
1.8V to 3.5V operating supply voltage
DC to AC conversion
Output voltage regulation
Adjustable output lamp frequency
Adjustable converter frequency
Enable/disable function
Applications
Pagers
Portable Transceiver
Cellular phones
Remote control units
Calculators
General Description
The Supertex HV826 is a high voltage driver designed for
driving EL lamps. The input supply voltage range is from 1.8V
to 3.5V. The device uses a single inductor and a minimum
number of passive components. The nominal regulated output
voltage that is applied to the EL lamp is ±80V. The chip can be
enabled/disabled by connecting the resistor on the RSW-Osc
pin to VDD/GND.
The HV826 has two internal oscillators, a switching MOSFET,
and a high voltage EL lamp driver. The frequency for the
switching MOSFET is set by an external resistor connected
between the RSW-Osc pin and the VDD supply pin. The EL
lamp driver frequency is set by an external resistor connected
between REL-Osc pin and the VDD pin. An external inductor
is connected between the LX pin and VDD pin. A 0.01-0.1µF
capacitor is connected between the CS pin and GND. The EL
lamp is connected between the VA pin and the VB pin.
The switching MOSFET charges the external inductor and
discharges it into the capacitor at the CS pin. The voltage at
CS will start to increase. Once the voltage at CS reaches a
nominal value of 80V, the switching MOSFET is turned OFF
to conserve power. The output pins VA and VB are configured
as an H bridge and are switching in opposite states to achieve
160V peak-to-peak across the EL lamp.
HV826 Block Diagram
VDD
RSW
GND
Switch
Osc
Disable
+
C
_ VREF
VSEN
Q
Q
Output
Osc
LX
CS
VA
Q
REL
VB
Q



HV826
HV826
Ordering Information
Device
Package Options
8-Lead SO
8-Lead MSOP
HV826
HV826LG
HV826LG-G
-G indicates package is RoHS compliant (‘Green’)
HV826MG
HV826MG-G
Absolute Maximum Ratings
Parameter
Value
Supply voltage, VDD
Output voltage, VCS
Operating Temperature Range
-0.5V to +4.5V
-0.5V to +100V
-25°C to +85°C
Storage Temperature Range
-65°C to +150°C
MSOP-8 Power Dissipation
250mW
SO-8 Power Dissipation
400mW
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.
Pin Configuration
VDD 1
8 VA
RSW-Osc 2
REL-Osc 3
HV826
7 VB
6 CS
GND 4
5 LX
Top View
8-Lead SOIC/ 8-Lead MSOP
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified - TA=25°C)
Symbol Parameter
Min Typ Max Units
Conditions
RDS(ON)
IIN
On-resistance of switching transistor
VDD supply current (including inductor
current)
-
-
- 6.0 Ω I = 100mA
35 45 mA VIN = 1.5V. See Fig.1
IDDQ Quiescent VDD supply current
-
-
100
nA RSW-Osc = LOW
VCS Output voltage on VCS
75 80 85
V VDD = 1.8V
VA-B
Differential output voltage across
lamp
150
160
170
V VDD = 1.8V - 3.5V
fEL VA-B output drive frequency
300 375 450
Hz VIN = 1.5V. See Fig.1
fSW Switching transistor frequency
- 80 - kHz VIN = 1.5V. See Fig.1
D Switching transistor duty cycle
- 88 - % See Fig.1
Recommended Operating Conditions
V Supply voltage
DD
fEL VA-B output drive frequency
TA Operating temperature
Enable/Disable Function Table
1.8
60
-25
- 3.5 V ---
-
1000
Hz ---
- +85 OC ---
EN-L
Logic input low voltage
0 - 0.5 V VDD = 1.8V - 3.5V
EN-H Logic input high voltage
VDD-0.5
-
VDD
V VDD = 1.0V - 3.5V
2







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