HV881 [SUPERTEX]
Dimmable, Low Noise, 16 channel EL Lamp Driver;
| 型号： | HV881 |
| 厂家： | 
Supertex, Inc |
| 描述： | Dimmable, Low Noise, 16 channel EL Lamp Driver |
| 文件： | 总8页 (文件大小：745K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Supertex inc.
HV881
Dimmable, Low Noise, 16 channel
EL Lamp Driver
Features
The HV881 has two internal oscillators and a high voltage
EL lamp driver. An external MOSFET is driven by the switch
oscillator to generate output voltage.
► Sixteen channel EL lamp driver with single common
terminal
► 1nF maximum load on each of the sixteen channels
► Independent dimming capability for all lamps
► Sixteen brightness levels for each lamp
► 1.8 to 5.5V operating supply range
► 1.7V logic interface
The frequency for the external switching MOSFET is set
by an external resistor connected between the RSW-Osc
pin and the VDD supply pin. The EL lamp driver frequency
can be set by either an external logic signal frequency at
the SEL pin or by an external resistor connected between
the REL-Osc pin and VDD pin. If external frequency is input
at the SEL pin, the REL-Osc pin should be connected to
ground.
► Dedicated enable logic pin
► 340VP-P nominal output voltage for high brightness
► Low audible noise
► Output voltage regulation
► EL1 - EL16 outputs fall time control
► Two EL frequency controls
An external inductor is connected between the LX and VDD
or VIN pins for split supply applications. Depending upon
the EL lamp sizes, a 1.0 to 10.0nF capacitor is connected
between the CS pin and ground. The CS capacitor is
connected to the internal H-bridge, and the energy stored
in the capacitor is therefore transferred to the EL lamp.
One side of all the sixteen EL lamps is connected to the
respective EL pins (EL1, EL2, etc.), and the other side is
connected to the COM pin.
► External switching MOSFET
► I2C data communication control
► Single lithium-ion cell compatible
► One miniature inductor to power sixteen lamps
► Independent lamp and converter frequency setting
► Split supply capability
► 5x5mm, 32-Lead QFN package
Applications
The external switching MOSFET charges the inductor and
discharges it into the capacitor at CS. The voltage at CS
will start to increase. Once the voltage at CS reaches the
desired regulation limit, the external switching MOSFET is
turned off to conserve power.
► Multi-segment, variable displays
► Cell phone keypads and displays
► Multi-segment remote controls
► Handheld wireless communication products
► Global Positioning Systems (GPS)
The HV881 allows for controlling the fall time of the EL1
- EL16 outputs by an external resistor from the RSLOPE
pin to the VDD pin. This feature can be used to reduce
the audible noise of the EL lamp or to increase the lamp
brightness.
General Description
The Supertex HV881 is a 16 channel EL lamp driver with a
single common terminal. It can drive up to a 1nF ELlamp load
(approx. 0.3in2 lamp size) on each of the sixteen channels.
The input supply voltage range is 1.8 to 5.5V. The logic
interface to the device can be as low as 1.7V. The device
has an enable logic input pin to turn the device on or off.
The brightness of each of the sixteen EL lamps can be
independently controlled to have one of fifteen brightness
levels or can be completely turned off by the serial data
(SDA) input. The serial data input has a 4-bit binary code
for each lamp, to control the brightness level from level 0
to level 15. The brightness is controlled by controlling the
number of EL frequency cycles (from 0 to 15) in a group of
15 cycles.
The device is designed to minimize audible noise emitted by
the EL lamp. The HV881 uses an external MOSFET, a single
inductor and minimum number of passive components to
drive all sixteen EL lamps. The device is designed such that
the input voltage to the inductor can be different from the
input voltage to the device (split supply).
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
HV881
Ordering Information
Pin Configuration
32
32-Lead QFN
5.00x5.00mm body
0.8mm height (max)
0.50mm pitch
Device
1
HV881
HV881K7-G
-G indicates package is RoHS compliant (‘Green’)
32-Lead QFN Package
(top view)
Absolute Maximum Ratings
Parameter
Note:
Pads are at the bottom of the package. Center heat slug is at ground
potential.
Value
-0.5 to 7.0V
-0.5 to VDD +0.5V
-0.5 to 215V
0.48V
VDD, supply voltage
EN, SDA, SCL, SEL
Product Marking
VCS, output voltage
L = Lot Number
HV881
LLLLLL
YYWW
YY = Year Sealed
WW = Week Sealed
A = Assembler ID
V
REG, external input voltage
Storage temperature
-65°C to +150°C
+125°C
Maximum junction temperature
AAACCC
C = Country of Origin
= “Green” Packaging
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.
32-Lead QFN Package
Package may or may not include the following marks: Si or
Thermal Resistance
Package
θja
32-Lead QFN
25°C/W
(Mounted on 4-layer FR4 9-via PCB, 76mm x 114mm x 1.44mm)
Recommended Operating Conditions
Sym
VDD
fSW
Parameter
Min
1.8
50
Typ
Max Units Conditions
Supply voltage
-
-
-
-
-
-
-
5.5
200
1000
8000
1.0
V
kHz
Hz
Hz
nF
nF
°C
---
Switching frequency
EL output frequency
Input for EL output frequency
Lamp capacitance per EL output
COM lamp capacitance
Operating temperature
---
fEL
200
1600
0
---
SEL
SEL = 8 x (fEL) and 50% duty cycle
CLOAD
CCOM
Tj
---
---
---
0
16
-40
+85
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
2
HV881
Electrical Characteristics
(Over recommended operating conditions unless otherwise specified TJ = 25°C)
Sym
VCS
Parameter
Min
145
290
-
Typ
170
340
-
Max
195
Unit Conditions
Output regulation voltage
Differential output voltage
Quiescent VDD supply current
V
V
VDD = 1.8 to 5.5V
VLAMP
IDDQ
390
VDD = 1.8 to 5.5V
VDD = 5.5V
1000
nA
VDD = 5.5V, REL = 2.0MΩ
RSW =1.0MΩ, RSL = 800kΩ
IDD
IIN
Input current going into the VDD pin
-
-
-
-
350
110
µA
See Typical Application Circuit,
VIN = 4.2V
Input current including inductor current
mA
VREG
fEL
External input voltage range
EL Lamp frequency
0
-
-
200
90
-
0.44
V
VDD = 1.8 to 5.5V
-
-
Hz
REL =2.0MΩ
fSW
D
Switching transistor frequency
External MOSFET duty cycle
-
kHz RSW =1.0MΩ
-
88
%
V
---
SEL, EN, SDA, SCL logic pins input
high level
VIH
VIL
1.7
0
-
-
VDD
0.2
VDD = 1.8 to 5.5V
SEL, EN, SDA, SCL logic pins input
low level
V
VDD = 1.8 to 5.5V
ILogic
ILogic-SEL
VGATE
EN, SDA, SCL pins input current
SEL logic pin input current
-1.0
-1.0
-
-
-
1.0
12.0
-
µA
µA
V
VDD = 1.8 to 5.5V
VDD = 1.8 to 5.5V
VDD = 1.8 to 5.5V
External MOSFET gate voltage
8.0
External MOSFET gate voltage rise
time
tGATE-RISE
tGATE-FALL
tf
-
-
-
100
-
-
20
-
ns
ns
µs
VDD = 1.8 to 5.5V, CL = 330pF
VDD = 1.8 to 5.5V, CL = 330pF
External MOSFET gate voltage fall
time
EL1 - EL16 outputs fall time for
½ EL cycle
RSL = 800kΩ, VDD = 3.0V,
VCS =170V
190
fCLK
tSU
tH
SCL speed
-
-
-
-
500
kHz ---
Setup time before clock falls
Hold time after clock falls
300
850
-
-
ns
ns
---
---
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
3
HV881
Typical Application Circuit
VIN
4.7µF
68µH
(Cooper SD53-680-R)
BAS20
Vishay
3.3nF, 200V
SiA456DJ
0.1µF
100kΩ
VREG VOUT VDRIVE
VDD
GATE
CS
0.3in2 EL Lamp 1
0.3in2 EL Lamp 2
0.3in2 EL Lamp 3
0.3in2 EL Lamp 4
0.3in2 EL Lamp 5
EL1
EL2
EL3
EL4
EL5
VDD
2.0MΩ
0.1µF
REL-Osc
1.0MΩ
800kΩ
HV881
RSW-Osc
RSLOPE
EN
ON = 1.7V to VDD
OFF = 0.7 to 0.2V
ON = 1.7V to VDD
OFF = 0 to 0.2V
SEL
0.3in2 EL Lamp 16
I2C Control:
EL16
SCL
SDA
ON = 1.7V to VDD
OFF = 0 to 0.2V
COM
GND
HVGND
Note:
The LX MOSFET may be changed depending on output load and required output power.
Test Data
Lamp
Brightness
(cd/m2)
VDD
(V)
VIN
(V)
IIN
(mA)
VCS
(V)
fEL
(Hz)
Lamp Size
0.3in2 lamp on
each of the
EL1 - EL16
outputs
3.2
3.7
4.2
72.1
62.3
52.3
160
160
160
190
190
190
33
35
36
3.0
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
4
HV881
Typical Output Waveform
VCS
EL1
COM
EL Lamp Brightness Control using I2C
No of
1
7
1
1
8
1
8
1
8
1
8
1
8
1
8
1
8
1
8
1
1
bits
bit
bits
bit
bit bits bit bits bit bits bit bits bit bits bit bits bit bits bit bits bit
bit
start slave
bit addr
W
bit
byte
0
byte
1
byte
2
byte
3
byte
4
byte
5
byte
6
byte
7
stop
bit
-
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
The I2C format for the SDA input is shown below:
Note:
The I2C is write-only. So the W bit has to always be logic low. (A “0” indicates a transmission write).
7-bit slave address: 000 0110 (0x06 in hex)
Each of the EL lamp’s brightness controls is a 4-bit binary number which is provided by the serial data input (SDA).
Byte 0 controls both the 16 level brightness of EL_lamp1 (bit0 - bit3) and EL_lamp2 (bit4 - bit7) and similarly, other bytes
control the brightness of other pairs of lamp.
1. If all the 4 bits for a designated EL lamp are L, the differential voltage across the lamp is zero.
2. If any of the 4 bits for a designated EL lamp is H:
a. The 4-bit value sets the average number of cycles for which the EL lamp voltage is non-zero.
b. The EL lamp brightness is linearly proportional to the binary lamp control code.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
HV881
Block Diagram
VIN
CIN
LX
D
CS
CG
VDD
CDD
VDD
VDRIVE GATE
CS
8V Linear
Regulator
Device
Enable
EN
RSW
RSW-Osc
PWM Switch
Oscillator
0 to 88%
VCS
EL1
EL Lamp 1
VSENSE
+
C
-
VREG
VOUT
1.26V
VREF
VCS
60pF
Output
Drivers
RREG
2 x EL
Freq.
EL16
EL Lamp 16
REL
REL-Osc
SEL
EL
EL1 to 16
Frequency
I2C Control
for
1.0MΩ
VCS
16 Level
EL Lamp
Dimming
SDA
SCL
COM
COM
RSL
RSLOPE
GND
Output Discharge
Slew Rate Control
HVGND
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
6
HV881
Pin Configuration and External Component Description
Pin #
Pin Name Description
The external resistor from REL-Osc to VDD sets the EL frequency. The EL frequency is inversely
REL-Osc proportional to the external REL resistor value. Reducing the resistor value by a factor of two will
result in increasing the EL frequency by two.
1
The external resistor, RSL, from RSLOPE to VDD, controls the EL1 - EL16 outputs discharge time.
The equation for the EL1 - EL16 outputs typical fall time is:
2
3
RSLOPE
tf(typ) = VCS / ((VDD - 0.85) / (RSL • 3pF))µs.
The external resistor from RSW-Osc to VDD sets the switch converter frequency. The switch con-
RSW-Osc verter frequency is inversely proportional to the RSW resistor value. Reducing the resistor value by
a factor of two will result in increasing the switch converter frequency by two.
The input voltage to set the VCS regulation voltage. This pin allows an external voltage source to
control the VCS amplitude in the range from 0 to 195V.
4
VREG
The output voltage is (403 ± 10%) • VREG.
The VREG voltage can also be set by using an external resistor between VREG and VOUT pins.
The output charging rate is inversely proportional to the resistor value.
Switched and voltage divided to one-third the internal reference voltage. An external resistor be-
tween VREG and VOUT pins controls the VCS charging rate. If this pin is not used, then it should
be left floating.
5
VOUT
6
7
VDD
GND
The low voltage input supply pin.
Device ground.
1.7V logic input pin to turn the device ON/OFF. A logic high turns ON the device and a logic LOW
turns the device OFF.
8
EN
9 – 16
17
EL16 - EL9 EL lamp 16, EL lamp 15 …. EL lamp 9 connections.
COM The common connection for all the 16 EL lamps.
EL8 - EL1 EL lamp 8, EL lamp 7 …. EL lamp 1 connections.
18 – 25
26
HVGND
High voltage ground. It should be connected to device ground.
Connect a 0.001µF to 0.01µF 200V capacitor between this pin and ground. This capacitor stores
the energy transferred from the inductor.
27
CS
28
29
SCL
SDA
The I2C logic serial clock input pin.
The I2C logic serial data input pin.
The gate control pin for the switching MOSFET. The connection for an external MOSFET.
In general, low RON MOSFET’s, which can handle more current, are more suitable to drive larger
size lamps. Also a small value inductor should be used. But as the RON value and the inductor
value decrease, the switching frequency of the inductor (controlled by RSW) should be increased
to avoid inductor saturation.
30
GATE
The external MOSFET threshold voltage minimum value should be equal to VDD or lower.
Drive voltage for the MOSFET gate voltage. An external bypass capacitor (CG) is required to
ground.
31
32
VDRIVE
SEL
The external logic signal input pin to set the EL frequency. If this pin is used, the REL-Osc pin
should be connected to ground.
The frequency input at this pin should be at 50% duty cycle and at eight times the desired EL
output frequency. If this pin is not used then it should be left floating. This pin has an internal pull-
down resistor of 1.0MΩ ± 50%.
Center Pad
Center heat slug, externally connected to Ground.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
7
HV881
32-Lead QFN Package Outline (K7)
5.00x5.00mm body, 0.80mm height (max), 0.50mm pitch
D2
D
32
32
Note 1
(Index Area
D/2 x E/2)
1
1
Note 1
(Index Area
D/2 x E/2)
e
b
E
E2
View B
Top View
Bottom View
Note 3
θ
L
Seating
Plane
A
A3
L1
A1
Note 2
Side View
View B
Notes:
1. A Pin 1 identifier must be located in the index area indicated. The Pin 1 identifier can be: a molded mark/identifier; an embedded metal marker; or
a printed indicator.
2. Depending on the method of manufacturing, a maximum of 0.15mm pullback (L1) may be present.
3. The inner tip of the lead may be either rounded or square.
Symbol
A
A1
A3
b
D
D2
1.05
-
E
E2
1.05
-
e
L
L1
0.00
-
θ
0O
-
MIN
NOM
MAX
0.70
0.75
0.80
0.00
0.02
0.05
0.18
0.25
0.30
4.85*
5.00
4.85*
5.00
0.30†
0.40†
0.50†
Dimension
(mm)
0.20
REF
0.50
BSC
5.15* 3.55† 5.15* 3.55†
0.15
14O
JEDEC Registration MO-220, Variation WHHD-6, Issue K, June 2006.
* This dimension is not specified in the JEDEC drawing.
† This dimension differs from the JEDEC drawing.
Drawings not to scale.
Supertex Doc. #: DSPD-32QFNK75X5P050, Version A052311.
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline
information go to http://www.supertex.com/packaging.html.)
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” Supertex inc. does not assume responsibility for use of devices described, and limits its liability
to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com)
©2011 Supertex inc.All rights reserved. Unauthorized use or reproduction is prohibited.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
Doc.# DSFP-HV881
A060811
8
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