Driver IC. HV857 Datasheet

HV857 IC. Datasheet pdf. Equivalent

Part HV857
Description High Voltage EL Lamp Driver IC
Feature Supertex inc. HV857 Low Noise, High Voltage EL Lamp Driver IC Features ►►Patented audible noise r.
Manufacture Supertex Inc
Datasheet
Download HV857 Datasheet




HV857
Supertex inc.
HV857
Low Noise, High Voltage
EL Lamp Driver IC
Features
►Patented audible noise reduction
►Patented lamp aging compensation
►190 VPP output voltage for higher brightness
Patented output timing for high efficiency
►Single cell lithium ion compatible
►150nA shutdown current
►Wide input voltage range 1.8 to 5.0V
Separately adjustable lamp and converter
frequencies
►Output voltage regulation
Split supply capability
►Available in 8-Lead MSOP and DFN packages
Applications
LCD backlighting
Mobile Cellular Phone
PDAs
Handheld wireless communication products
Global Positioning Systems (GPS)
General Description
The Supertex HV857 is a high voltage driver designed for driving
Electroluminescent (EL) lamps of up to 5.0 square inches. The
input supply voltage range is from 1.8 to 5.0V. 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 ±95V. The chip can be enabled/disabled by connecting the
resistor on RSW-Osc to VDD/GND.
The HV857 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 supply pin VDD. The EL lamp driver
frequency is set by an external resistor connected between REL-
Osc pin and VDD pin. An external inductor is connected between
the LX and VDD pins or VIN for split supply applications. A 0.003-
0.1µF capacitor is connected between CS and ground. The EL
lamp is connected between VA and VB.
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
95V, the switching MOSFET is turned OFF to conserve power. The
outputs VA and VB are configured as an H bridge and are switching
in opposite states to achieve ±95V across the EL lamp.
Typical Application Circuit
ON = VDD
Enable Signal
OFF = 0
+
_VDD
CDD
1 VDD
VA 8
RSW
HV857
2 RSW-Osc
VB 7
EL Lamp
+
_VIN
3 REL-Osc
CS 6
REL
4 GND
LX 5
D
CIN LX CS
Doc.# DSFP-HV857
A062013
Supertex inc.
www.supertex.com



HV857
Ordering Information
Part Number
Package
Packing
HV857K7-G
8-Lead DFN
3000/Reel
HV857MG-G
8-Lead MSOP 2500/Reel
-G denotes a lead (Pb)-free / RoHS compliant package
Absolute Maximum Ratings
Parameter
Value
Supply voltage, VDD
Operating temperature
-0.5V to 6.5V
-40°C to +85°C
Storage temperature
-65°C to +150°C
DFN-8 power dissipation
1.6W
MSOP-8 power dissipation
300mW
Output voltage, VCS
-0.5 to +120V
Absolute Maximum Ratings are those values beyond which damage to the
device may occur. Functional operation under these conditions is not im-
plied. Continuous operation of the device at the absolute rating level may
affect device reliability. All voltages are referenced to device ground.
Typical Thermal Resistance
Package
θja
8-Lead DFN
37OC/W
8-Lead MSOP
171OC/W
Mounted on FR4 board, 25mm x 25mm x 1.57mm
HV857
Pin Configuration
VDD 1
RSW-Osc 2
REL-Osc 3
GND 4
8 VA
7 VB
6 CS
5 LX
8-Lead DFN
(top view)
Pads are at the bottom of the package.
Exposed center pad is at ground potential.
VDD 1
8 VA
RSW-Osc 2
7 VB
REL-Osc 3
6 CS
GND 4
5 LX
8-Lead MSOP
(top view)
Product Marking
H857
YWLL
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
Package may or may not include the following marks: Si or
8-Lead DFN
Top Marking
H857
LLLL
Bottom Marking
YYWW
L = Lot Number
YY = Year Sealed
WW = Week Sealed
= “Green” Packaging
Package may or may not include the following marks: Si or
8-Lead MSOP
Recommended Operating Conditions
Sym Parameter
Min Typ Max Units Conditions
VDD Supply voltage
fEL Operating drive frequency
TA Operating temperature
1.8 - 5.0 V ---
- - 1.0 kHz ---
-40 - +85 OC ---
Enable/Disable Function Table
Sym Parameter
EN-L Logic input low voltage
EN-H Logic input high voltage
Min
0
VDD - 0.2
Typ
-
-
Max
0.2
VDD
Units
V
V
Conditions
VDD = 1.8 to 5.0V
VDD = 1.8 to 5.0V
DC Electrical Characteristics (Over recommended operating conditions unless otherwise specified, TA = 25°C)
Sym Parameter
Min Typ Max Units Conditions
RDS(ON)
VCS
On-resistance of switching transistor
Max. output regulation voltage
- - 6.0 Ω I = 100mA
85 95 105 V VDD=1.8 to 5.0V
Doc.# DSFP-HV857
A062013
Supertex inc.
2 www.supertex.com







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