Microchip HV859 Manual de Usario

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2023 Microchip Technology Inc. and its subsidiaries DS20005711A-page 1
HV859
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
150 nA Shutdown Current
Wide Input Voltage range of 1.8V to 5V
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 HV859 is a high-voltage driver designed for driving
Electroluminescent (EL) lamps of up to 5 in
2. The input
supply voltage range is from 1.8V to 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 ±105V. The
chip can be enabled/disabled by connecting the
resistor on RSW-Osc to VDD/Ground.
The HV859 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 VDD pin. The EL lamp driver frequency is set by an
external resistor connected between RSW-Osc pin and
the VDD pin. An external inductor is connected
between the LX and VIN for split supply applications. A
capacitor with a value between 0.003 µF to 0.1 µF,
200V rated, is connected between C
S 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 C
S
. Then, the
voltage at CSwill start to increase. Once the voltage at
CS reaches a nominal value of 105V, 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 ±105V across
the EL lamp.
Package Types
Pads of the 8-lead DFN are at the bottom of the package. See Table 2-1 for pin
information.
8-lead MSOP 8-lead WDFN
1
2
3
4
8
7
6
5
VA
VB
CS
LX
VDD
RSW-Osc
REL-Osc
GND
VDD
RSW-Osc
REL-Osc
GND
1
2
3
4
8
7
6
5
VA
VB
CS
LX
High-Voltage EL Lamp Driver for Low-Noise Applications
HV859
DS20005711A-page 2 2023 Microchip Technology Inc. and its subsidiaries
Functional Block Diagram
Q
Q
Q
Q
-
+
VDD
GND
Disable
VDD
RSW-Osc VB
VA
CS
LX
RSW-Osc
VREF
High
Voltage
Level
Trans-
lators
VSENSE
C
Switch
OSC
Switch
OSC
2023 Microchip Technology Inc. and its subsidiaries DS20005711A-page 3
HV859
Typical Application Circuit
D
+
-
+
-
VDD
VIN
CDD
CIN
RSW
REL
CS
RSER
L
X
EL Lamp
Enable
ON = VDD
OFF = 0V
1
2
3
4
8
7
6
5
HV859
VDD
RSW-Osc
REL-Osc
GND
VA
VB
CS
LX

Especificaciones del producto

Marca: Microchip
Categoría: No categorizado
Modelo: HV859

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