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Details, datasheet, quote on part number:HV832MG
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Datasheet text preview:
HV832
Preliminary
Dual High Voltage, Low Noise EL Lamp Driver
Ordering Information
Package Options Device HV832 MSOP-8 HV832MG* Die HV832X
General Description
The Supertex HV832 is a high voltage driver designed for driving two EL lamps with a combined area of 3.5 square inches. The input supply voltage range is from 2.0V to 3.6V. The device is designed to reduce the amount of audible noise emitted by the lamp. 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 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 pins. A 0.001 to 0.01µF, 100V capacitor is connected between CS 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 80V, the switching MOSFET is turned off to conserve power. The outputs EL1 to Com and EL2 to Com are configured as H bridges and are switching in opposite states to achieve 160V across the EL lamp.
* Product supplied on 2500 piece carrier tape reels.
Features
2.0V to 3.6V operating supply voltage DC to AC conversion Low noise Output voltage regulation Enable/disable function
Applications
Mobile cellular phones Pagers Portable instrumentation Portable transceivers
Absolute Maximum Ratings*
Supply voltage, VDD Output voltage, VC
S
-0.5V to 7.5V -0.5V to +100V -40°C to +85°C -65°C to +150°C 250mW
Pin Configuration
Operating Temperature Range Storage Temperature Range 8 Pin MSOP Power Dissipation
* All voltages are referenced to ground.
E L1 VDD Control GND
1 2 3 4
8 7 6 5
EL 2 Com CS LX
top view MSOP-8
11/12/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the 1 Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
HV832
Electrical Characteristics
Symbol R DS(ON) VDD VCS Vdiff ID D Q ID D II N Parameter
DC Characteristics (Over recommended operating conditions unless otherwise specified, TA = 25°C)
Min Typ Max 7.0 2.0 75 150 80 160 3.6 85 170 150 150 26.5 30 mA 12 VCS fEL fS W fSW Drift D IIL Output voltage on VCS Vdiff output drive frequency Switching transistor frequency Switching transistor frequency Drift Switching transistor duty cycle Input logic low current going into the control pin. Input logic high current going into the control pin. Logic input low voltage Logic input high voltage 0 1.75 85 0.6 µA II H VIL VIH 0.6 0.25 VDD V V 350 44.8 74 400 51.2 450 57.6 +/- 5.0 16 V Hz KHz KHz % Units V V V nA µA VDD = 2.0V to 3.6V VIN = 3.0V. TA = -40°C to +85°C. See Figure 1. VIN = 3.0V. TA = 25°C. See Figure 1. VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. VIN = 3.0V. See Figure 1. TA = -40°C to +85°C See Figure 1. VDD = 2.0V to 3.6V VDD = 2.0V to 3.6V Conditions I = 100mA On-resistance of switching transistor Input voltage range Output regulation voltage differential output voltage across each lamp (EL1 to Com, EL2 to Com) Quiescent VDD supply current Input current into VDD pin Input current including inductor current
VDD = 2.0V to 3.6V. See Figure 1.
* The inductor used is a 560uH Murata inductor, typ DC resistance of 7.8 Ohms, part # LQS33C561.
Recommended Operating Conditions
Symbol VDD TA Supply voltage Operating temperature Parameter Min 2.0 -40 Typ Max 3.6 85 Units V °C Conditions
Function Table
Control Power up 1 st 2 nd 3 rd 4 th pulse L to H pulse L to H pulse L to H pulse L to H EL1 HI Z ON HI Z ON HI Z EL2 HI Z HI Z ON ON HI Z Com HI Z ON ON ON HI Z IC OFF ON ON ON OFF
2
HV832
Functional Block Diagram
LX VDD CS Control Control Logic & Switch Osc EL1
GND Disable
+ C _ Vref
Vsen
EL Osc = Switch Osc ÷ 128
Output Osc
EL2
Com
Typical Application Circuit
VDD Logic Input Pulse VDD = VIN EL Lamp 1
1 EL1 2 VDD 3 Control
EL2 Com CS LX
8
EL Lamp 2
7 6
1N4148*
VIN
+ _
4 GND
4.7µF
5
LX 560µH 0.01µF 100V
HV832MG
LX = 560µH Murata (LQH4N561)
Figure 1
Device HV832MG Lamp Size 1.5in 2 V DD 3.0V IDD max 26.5mA
* or any (equivalent or better) >85V, fast reverse recovery diode
VCS min 74V
fEL 400Hz
Brightness 7.5ft-lm
TA -40°C to +85°C
3
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