Lamp Driver. HV832 Datasheet

HV832 Driver. Datasheet pdf. Equivalent

Part HV832
Description High Voltage Dual EL Lamp Driver
Feature HV832 Obsolete High Voltage Dual EL Lamp Driver for Low Noise Applications Features ► Patented au.
Manufacture Supertex Inc
Datasheet
Download HV832 Datasheet




HV832
HV832
High Voltage Dual EL Lamp Driver
for Low Noise Applications
Features
Patented audible noise reduction
Patented lamp aging compensation
210 VPP output voltage for higher brightness
Patented output timing for high efficiency
Single cell lithium ion compatible
150nA shutdown current
Wide input voltage range 1.8V to 5.0V
Separately adjustable lamp and converter
frequencies
Output voltage regulation
Split supply capability
Applications
LCD backlighting
Mobile Cellular Phone keypads
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
General Description
The Supertex HV832 is a high voltage driver designed for driving two
EL lamps with a combined area of 3.5in2. The input supply voltage
range is from 2.0V to 5.0V. The device is designed to reduce the
amount of audible noise emitted by the lamp. It uses a single inductor
and a minimum number of passive components. The nominal
regulated output voltage that is applied to the EL lamp is ±90V.
The HV832 has an internal oscillator, a switching MOSFET, and
two high voltage EL lamp drivers. The frequency for the switching
MOSFET is set at 51KHz nominal. The EL lamp driver frequency is
set by dividing the MOSFET switching frequency by 128. An external
inductor is connected between the LX and VDD or VIN pins for split
supply applications. A 0.001 to 0.01µF, 100V capacitor is connected
between the CS pin and Ground. The EL lamps are connected
between EL1 to Com and EL2 to Com.
An input control pin is available to select various modes of the device.
Each logic pulse applied to the control pin will cause the device to
change to the next mode. The sequence for the modes is: (1) EL1 on
only, (2) EL2 on only, (3) both EL1 and EL2 on, and (4) device shuts
down. During power up of the device, the mode will default to shut
down.
The switching MOSFET charges the external inductor and discharges
it into the capacitor at CS. The voltage at CS will start to increase.
Once the voltage at CS reaches a nominal value of 90V, the switching
MOSFET is turned off to conserve power. The outputs EL1 to Com
and EL2 to Com are configured as H bridges EL1/EL2 and Com
and are switching in opposite states to achieve 180V across the EL
lamp.
Typical Application Circuit
VDD
Logic Input Pulse
+
VIN _
CIN
1 EL1
EL2 8
2 VDD
Com 7
3 Control CS 6
4 GND
LX 5
HV832MG
EL Lamp 1
EL Lamp 2
LX CS



HV832
HV832
Ordering Information
Device
Package Options
MSOP-81
HV832
HV832MG
-G indicates package is RoHS compliant (‘Green’)
HV832MG-G
Absolute Maximum Ratings
Parameter
Value
Supply voltage VDD
Output voltage, VCS
Operating Temperature
-0.5V to 7.5V
-0.5V to 125V
-40°C to +85°C
Storage Temperature
-65°C to +150°C
Power Dissipation MSOP-8
300mW
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
EL1 1
VDD 2
Control 3
GND 4
HV832
(Top View)
8 EL2
7 Com
6 CS
5 LX
Recommended Operating Conditions
Sym Parameter
Min Typ
VDD Supply voltage
TA Operating Temperature
2.0 -
-40 -
Max
5.0
+85
Units
V
°C
Conditions
---
---
DC Electrical Characteristics (Over recommended operating conditions unless otherwise specified VIN = VDD = 3.3V, TA=25°C)
Sym
RDS(ON)
VCS
Parameter
On-resistance of switching
transistor
Max. output regulation voltage
Min Typ Max Units Conditions
- - 6.0 Ω I = 100mA
80 90 100 V VDD= 2.0V to 5.0V
VDIFF
Peak to Peak output voltage
160 180 200
V VDD= 2.0V to 5.0V
I Quiescent V supply current
DDQ
DD
- - 150 nA ---
IDD
Input current going into the VDD pin
-
- 150 µA VDD= 2.0V to 5.0V.
IIN
Input current including inductor
current
- 27 32 mA VIN= 3.0V. Driving EL1 or EL2. See Fig1.*
- 38 43
VIN= 3.0V. Driving both EL1 and EL2. See Fig1.*
VCS Output voltage on VCS
68 78 87 V VIN = 3.0V. Driving EL1 or EL2. See Fig1.*
62 70 78
VIN= 3.0V. Driving both EL1 and EL2. See Fig1.*
fEL VDIFF output drive frequency
350 400 450 Hz VIN= 3.0V. See Fig1.*
Fsw Switching transistor frequency
44.8 51.2 57.6 kHz VIN= 3.0V. See Fig1.*
FSW DRIFT Switching transistor frequency drift
-
- ±5.0 kHz TA= -40°C to +85°C
D
Switching transistor duty cycle
85 -
- % See Fig 1.
IIL
Input logic low current going into
the control pin.
-
- 0.6
I
IH
Input logic high current going into
the control pin.
-
µA VDD= 2.0V to 5.0V. See Fig 1.
- 0.6
VIL Logic input low voltage
0 - 0.25 V ---
V Logic input high voltage
IH
175 - V
V ---
DD
* The inductor used is a 220µH Murata inductor, max DC resistance of 8.4Ω, part # LQH32CN221K21.
2







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