Microchip HV853 Handleiding

Microchip Niet gecategoriseerd HV853

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1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
HV853
Features
No external components required when using an
external EL clock frequency
Audible noise reduction with improved EMI
EL frequency can be set by an external resistor
DC to AC converter
Drives up to 5.3nF (approx. 1.5in2 lamp) load
Output voltage regulation
Enable function
EL Lamp dimming
Available in 10-Lead DFN and 8-Lead MSOP
packages
Applications
Cellular phone keypad
Watches
Small handheld wireless devices
MP3 Players
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General Description
The Supertex HV853 is a high voltage, low noise EL
(electroluminescent) lamp driver. It is the low noise version of
the HV852 with improved EMI performance, operating over an
input voltage range of 3.2V to 5.0V. It is designed to drive EL
lamps of up to 1.5in2, with capacitive values up to 5.3nF. The
HV853 converts a low voltage DC input to a high voltage AC
output across an EL lamp. A nominal regulated output voltage
of ±80V is applied to the 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.
The EL lamp frequency can be set either by an external
resistor REL or by applying an external clock where the clock
frequency is divided by 128 to set the EL lamp frequency.
Typical Application Circuits
High Voltage, Low Noise,
Inductorless EL Lamp Driver
EL Lamp Frequency set by REL
+
-
VDD = ON
GND = OFF
VDD CDD
VDD
GND
EL
LAMP
VDD
+
-GND
CLKEN
VA
VB
CLKIN
EN
REL
VDD
GND
CLKEN
VA
VB
CLKIN
EN
REL
VDD EL
LAMP
VDD CDD
REL
VDD = ON
GND = OFF
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
HV853MG HV853MG
EL Lamp Frequency set by External Clock
2
HV853
1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
Ordering Information
DEVICE
Package Options
10-Lead DFN
3.00x3.00mm body
0.80mm height (max)
0.50mm pitch
8-Lead MSOP
3.00x3.00mm body
1.10mm height (max)
0.65mm pitch
HV853 HV853K7-G HV853MG-G
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter Value
VDD, supply voltage -0.5V to 6.5V
Storage temperature -65°C to +150°C
Power dissipation (10-Lead DFN) 1.6W
Power dissipation (8-Lead MSOP) 300mW
Sym Parameter Min Typ Max Units Conditions
IDDQ Quiescent current - - 150 nA EN = 0V
VA or VBPeak output voltage 68 80 92 V No load
VA-VBPeak to peak output voltage 136 160 184 V
IDD Operating current - 15 30 mA See Figure 1
VDD = 3.5V
REL = 1.5M℩
Load = 3.3nF + 1.0k℩
VA or VBPeak output voltage 68 80 92 V
VA-VBPeak to peak output voltage 136 160 184 V
fEL EL lamp frequency 240 280 320 Hz
Electrical Characteristics
(Over recommended operating conditions unless otherwise speciïŹed, T
A = 25ÂșC)
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 ConïŹgurations
Product Marking
8-Lead MSOP(MG)
10-Lead DFN (K7)
H853
YWLL
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
H853
LL LL
YYWW
Top Marking
Bottom Marking
1
2
3
4
8
7
6
5
8-Lead MSOP (MG)
(top view)
GND
VA
VB
CLKEN
VDD
REL
EN
CLKIN
10-Lead DFN (K7)
(top View)
1
2
3
GND
VA
VB
CLKEN
VDD
REL
EN
CLKIN
4
5
8
7
6
9
10
GND
NC
Recommended Operating Conditions
Sym Parameter Min Typ Max Units Conditions
VDD Input voltage 3.2 - 5.0 V ---
fEL EL lamp frequency 50 - 500 Hz ---
Cload EL lamp capacitance 0 - 5.3 nF ---
TAOperating temperature -25 - +85 OC ---
Note:
Pads are at the bottom of the package.
Center heat slug should be connected to
GND or left ïŹ‚oating.
3
HV853
1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com● ● ●
Functional Block Diagram
Feedback
VDD
MOSFET
Full Bridge
REL
VDD
VA
VB
EN
GND
CLKIN
CLKEN
VDD
VSENSE High
Voltage
Level
Trans-
lators
EL
Oscillator
Capacitor
Charge
Pump Circuit
Typical Output Waveform
trout Output voltage rise time - 450 - ”s 1.0in2 lamp
0V to 90% of ïŹnal value
tfout Output voltage fall time 150 - - ”s 90% to 10% of ïŹnal value
Logic Inputs
VIL Input logic low voltage 0 - 0.5 V ---
VIH Input logic high voltage 2.0 - VDD V ---
IIL Input logic low current - - 1.0 ”A ---
IIH Input logic high current - - 1.0 ”A ---
ENrise Enable input rise time (for delay turn off) 0.01 - 10 ms Using external R-C circuit,
see Figure 2
ENfall Enable input fall time (for delay turn off) 10” - 5.0 s
Cin Logic input capacitance - - 10 pF ---
Sym Parameter Min Typ Max Units Conditions
Electrical Characteristics (cont.)
(Over recommended operating conditions unless otherwise speciïŹed, T
A = 25ÂșC)

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: HV853

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