Microchip HV852 Handleiding

Microchip Niet gecategoriseerd HV852

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1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
HV852
Features
No external components required when using an
external EL clock frequency
EL frequency can be set by an external resistor
Low Noise
DC to AC converter
Drives up to 5.3nF (approx. 1.5in2 lamp) load
Output voltage regulation
Enable function
EL Lamp dimming
Applications
Cellular phone keypad
Watches
Small handheld wireless devices
MP3 Players
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General Description
The Supertex HV852 is a high voltage, low noise, inductorless
EL (electroluminescent) lamp driver. It is designed to drive EL
lamps of up to 1.5in2, with capacitive values up to 5.3nF over
an input voltage range of 2.4 to 5.0V. The HV852 converts a
low voltage DC input to a high voltage AC output across an
EL lamp. It uses a charge pump scheme to boost the input
voltage eliminating the need for an external inductor, diode,
and high voltage capacitor commonly found in conventional
topologies.
The charge pump circuit discharges its energy into an EL lamp
through a high voltage H-bridge. Once the voltage reaches
its regulated limit, it is turned off to conserve power. The EL
lamp is then discharged to ground and the H-bridge changes
state to allow the charge pump to charge the EL lamp in the
opposite direction.
Typical Application Circuit
High Voltage,
Low Noise,
Inductorless EL Lamp Driver
EL Lamp frequency set by REL
+
-
EL LAMP
VDD CDD
REL
VDD = ON
GND = OFF
HV852MG
GND
VA
VB
EN
REL
VDD
CLKENCLKIN
2
HV852
1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
Ordering Information
Device
Package Options
8-Lead MSOP
3.00x3.00mm body
1.10mm height (max)
0.65mm pitch
10-Lead DFN
3.00x3.00mm body
0.80mm height (max)
0.50mm pitch
HV852 HV852MG-G HV852K7-G
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter Value
VDD, supply voltage -0.5V to 6.5V
Operating temperature -25°C to +85°C
Storage temperature -65°C to +150°C
Power dissipation: 8-Lead MSOP 300mW
Power dissipation: 10-Lead DFN 1.6W
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 Configurations
1
2
3
4
8
7
6
5
8-Lead MSOP
(top view)
GND
VA
VB
CLKEN
VDD
REL
EN
CLKIN
VDD
REL
EN
GND
1
2
3
4
10
9
8
7
VA
VB
5 6
GND
VDD CLKEN
CLKIN
10-Lead DFN
(top view)
Note:
Pads are at the bottom of the pack-
age. Center heat slug is at ground
potential.
Product Marking
H852
Y W L L
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
L = Lot Number
YY = Year Sealed
WW = Week Sealed
= “Green” Packaging
H852
LLLL
YYWW
Top Marking
Bottom Marking
10-Lead DFN (K7)
8-Lead MSOP (MG)
Recommended Operating Conditions
Sym Parameter Min Typ Max Units Conditions
VDD Input voltage 2.4 - 5.0 V ---
fEL EL lamp frequency 50 - 500 Hz ---
Cload EL lamp capacitance 0 - 5.3 nF ---
TAOperating temperature -25 - +85 °C ---
Package may or may not include the following marks: Si or
Package may or may not include the following marks: Si or
3
HV852
1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
Typical Output Waveform (refer to Figure 1)
Test Conditions:
HV852 driving a 1.0in2 EL lamp
VDD= 3.6V and REL
= 1.5MΩ,
VA-VB waveform
IDDQ Quiescent current - - 200 nA EN = 0V
VA or VBPeak output voltage 72 82 92 V No load
VA
-VBPeak to peak output voltage 144 164 184 V
IDD Operating current - 15.2 30 mA
See Figure 1, VDD = 3.5V,
REL = 1.5MΩ, Load = 3.3nF+1kΩ
VA or VBPeak output voltage 72 82 92 V
VA
-VBPeak to peak output voltage 144 164 184 V
fEL EL lamp frequency 210 250 300 Hz
trout Output voltage rise time - 640 - µs 1.0in2 lamp, 10 to 90% of final value
Logic Inputs
Sym Parameter Min Typ Max Units Conditions
VIL Input logic low voltage 0 - 0.5 V ---
VIH Input logic high voltage 1.75 - VDD V VDD = 2.4 to 4.3V. TA = -25 to 85OC
2.0 - VDD V 4.3 < VDD ≤ 5.0V. T
A = -25 to 85OC
IIL Input logic low current - - 1.0 µA VIL = 0V, VDD = 2.4 - 5.0V
IIH Input logic high current - - 1.0 µA V IH = V
DD = 2.4 - 5.0V
trEN Enable input rise time (for delay turn on) 0.01 - 10 ms Using external R-C circuit,
see Figure 2
tfEN Enable input fall time (for delay turn off) 10µ - 5.0 s
Cin Logic input capacitance - - 10 pF ---
Sym Parameter Min Typ Max Units Conditions
Electrical Characteristics (Over recommended operating conditions unless otherwise specified: T
A = 25ºC, VDD = 3.5V)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV852

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