HV860K7-G [SUPERTEX]
Low Noise Dimmable EL Lamp Driver; 低噪音可调光致发光灯驱动器
| 型号： | HV860K7-G |
| 厂家： | 
Supertex, Inc |
| 描述： | Low Noise Dimmable EL Lamp Driver |
| 文件： | 总7页 (文件大小：315K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Supertex inc.
HV860
Initial Release
Low Noise Dimmable EL Lamp Driver
The HV860 has two internal oscillators, a switching
MOSFET, and a high voltage EL lamp driver H-bridge. The
frequency for the switching MOSFET is set by an external
resistor connected between the RSW-OSC pin and the supply
pin V . The EL lamp driver frequency is set by an external
external inductor is connectedELb-OeStCween the LDXDand VDD
pins or VIN for split supply applications. A 3.0nF capacitor
is connected between CS and ground. The EL lamp is
connected between VA and VB.
Features
► Adjustable output regulation for dimming
► 220VPP output voltage for higher brightness
► Single cell lithium ion compatible
► 150nA shutdown current
► Separately adjustable lamp and converter frequencies
► 3x3 QFN-12 package
► Split supply capability
resistDoDr connected between R
pin and V pin. An
Applications
► Mobile cellular phone keypads
► PDAs
► Handheld wireless communication products
► Global Positioning Systems (GPS)
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 110V, the switching MOSFET is turned OFF to
conserve power. The outputs VA and V are configured as
an H bridge and are switching in opposiBte states to achieve
110V across the EL lamp.
General Description
EL lamp dimming can be accomplished by changing the
input voltage to the VREG pin. The VREG pin allows an external
voltage source to control the V amplitude. The VCS voltage
The Supertex HV860 is a high voltage driver designed for
driving Electroluminescent, (EL), lamps of up to 5 square
inches. The input supply voltage range is from 2.5V to 4.5V.
The device uses a single inductor and a minimum number of
passive components. Using the internal reference voltage,
the regulated output voltage is at a nominal voltage of 110V.
The EL lamp will therefore see 110V. An enable pin, (EN),
is available to turn the device on and off via a logic signal.
is approximately 87 times the CvSoltage seen on VREG
.
Typical Application Circuit
VIN
CIN
LX
D
RREG
2
3
5
CS
VREG
VDD
VREF LX
CS
10
12
7
VDD
RSW
CDD
RSW-OSC
REL-OSC
EN
9
8
VA
VB
1
EL
Lamp
REL
1.5V = On
0V = Off
11
GND
4
HV860K7
NR040306
Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: (408) 222-8888 FAX: (408) 222-4895 www.supertex.com
·
·
·
·
1
HV860
Thermal Resistance
Ordering Information
Package Option
QFN-12
Package
θja
Device
QFN-12
60 °C/W
HV860
HV860K7-G
-G indicates package is RoHS compliant (‘Green’)
Pin Configuration
V
EN
R
DD
SW-OSC
11 10
12
9
8
7
V
1
2
3
R
Absolute Maximum Ratings
Parameter
VDD, Supply Voltage
Operating Temperature
Storage Temperature
Power Dissipation QFN-12
VCS, Output Voltage
A
B
S
EL-OSC
Value
-0.5V to 6.0V
-40°C to +85°C
-65°C to +150°C
1.6W
V
HV860K7
V
C
REG
V
REF
4
5
6
-0.5V to +120V
GND
NC
L
X
VREG External Input Voltage
1.33V
QFN-12 Top View
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.
Note: Pads are at the bottom of the package. Center heat slug is at ground
potential
Electrical Characteristics
DC Characteristics (Over recommended operating conditions unless otherwise specified TA=25°C)
Symbol
RDS(ON)
VCS
Parameter
Min
Typ
Max Units Conditions
On-resistance of switching
transistor
-
-
Ω
6.0
I = 100mA
-
-
95
75
55
-
Maximum output regulation voltage
120
-
V
VDD = 2.5V to 4.5V
-
VDD = 2.5V to 4.5V, VREG = 1.092V
VDD = 2.5V to 4.5V, VREG = 0.862V
VDD = 2.5V to 4.5V, VREG = 0.632V
VDD = 2.5V to 4.5V
VCS
Output regulation voltage
-
-
V
-
0
-
VREG
VREFH
IDDQ
External input voltage range
VREF output high voltage
1.26
1.33
150
V
V
1.18
-
1.26
-
VDD = 2.5V to 4.5V
Quiescent VDD supply current
nA
EN = low
VDD = 2.5V to 4.5V, REL = 2.0MΩ,
RSW = 1.0MΩ
-
-
IDD
IIN
Input current going into the VDD pin
200
16
µA
Input current including inductor
current
-
-
mA
Hz
see Figure 2
fEL
fSW
D
EL lamp frequency
160
76
-
200
240
104
88
REL = 2.0MΩ
Switching transistor frequency
Switching transistor duty cycle
Enable input logic high voltage
Enable input logic low voltage
Enable input logic high current
90
-
kHz RSW = 1.0MΩ
%
V
---
-
VIH
VIL
IIH
1.5
0
VDD
0.2
1.0
VDD = 2.5V to 4.5V
VDD = 2.5V to 4.5V
VIH = VDD = 2.5V to 4.5V
-
V
-
-
µA
NR040306
2
HV860
Electrical Characteristics (cont.)
Symbol
Parameter
Min
Typ
Max Units Conditions
-
-
-
-
IIL
Enable input logic low current
Enable input capacitance
-1.0
15
µA
pF
VIL = 0V, VDD = 2.5V to 4.5V
---
CIN
Recommended Operating Conditions
Symbol
Parameter
Min
2.5
40
Typ
Max Units Conditions
-
-
-
-
-
VDD
Supply voltage
4.5
200
500
20
V
kHz
Hz
nF
---
---
---
---
---
fSW
Switching frequency
EL output frequency
EL lamp capacitance load
Operating Temperature
fEL
200
0
CLOAD
TA
-40
+85
°C
Pin Configuration and External Component Description
Pin #
Name
Description
External resistor from R
to VDD sets the EL frequency. The EL frequency is inversely proportional
1
REL-OSC to the external REL resistEoLr-OvSCalue. Reducing the resistor value by a factor of two will result in increasing
the EL frequency by two.
Input voltage to set VCS regulation voltage. This pin allows an external voltage source to control the VCS
amplitude. EL lamp dimming can be accomplished by varying the input voltage to VREG. The VCS voltage
is approximately 87 times the voltage seen on VREG
.
2
VREG
External resistor RREG, connected between VREG and VREF pins controlls the VCS charging rate. The
charging rate is inversely proportional to the RREG resistor value.
3
4
VREF
Switched internal reference voltage.
GND
Device ground.
Drain of internal switching MOSFET. Connection for an external inductor.
The inductor LX is used to boost the low input voltage by inductive flyback. When the internal switch
is on, the inductor is being charged. When the internal switch is off, the charge stored in the inductor
will be transferred to the high voltage capacitor CS. The energy stored in the capacitor is connected
to the internal H-bridge, and therefore to the EL lamp. In general, smaller value inductors, which can
handle more current, are more suitable to drive larger size lamps. As the inductor value decreases, the
switching frequency of the inductor (controlled by RSW) should be increased to avoid saturation.
5
LX
A 220µH Cooper (SD3814-221) inductor with 5.5Ω series DC resistance is typically recommended. For
inductors with the same inductance value, but with lower series DC resistance, lower RSW resistor value
is needed to prevent high current draw and inductor saturation.
6
7
NC
CS
No internal connections to the device.
High voltage regulated output. Connection for an external high voltage capacitor to ground
VB side of the EL lamp driver H-bridge. Connection for one of the EL lamp terminals.
VA side of the EL lamp driver H-bridge. Connection for one of the EL lamp terminals.
Low voltage input supply pin.
8
VB
9
VA
10
11
VDD
EN
Logic input pin. Logic high will enable the device.
External resistor from R
will result in increasing the switch converSteWr frequency by two.
to V sets the switch converter frequency. The switch converter frequency
12
RSW-OSC is inversely proportionalStWo-OtShCe extDeDrnal R resistor value. Reducing the resistor value by a factor of two
NR040306
3
HV860
Figure 1: Block Diagram
CS
VDD
Device Enable
LX
EN
PWM Switch
Oscillator
RSW-OSC
0 to 88%
VA
+
VSENSE
C
-
Output
Drivers
VREG
1.26V
VREF
60pF
VCS
VREF
2x EL
Freq.
VB
REL-OSC
EL
Frequency
GND
Figure 2: Typical Application / Test Circuit
+
4.7μF
VIN
-
220μH
(Cooper Inductor SD3814-221)
3.3MΩ
3
5
2
BAS21
7
3.3nF
200V
VREG
VDD
VREF LX
CS
10
12
VDD
1.0MΩ
2.0MΩ
0.1μF
RSW-OSC
REL-OSC
EN
9
8
VA
VB
1
3.0in2
EL Lamp
1.5V = ON
0V = Off
11
GND
4
HV860K7
Typical Performance
VDD
Lamp Size
VIN
IIN
VCS
fEL
Brightness
3.0V
3.5V
4.2V
16.17mA
14.18mA
12.13mA
18.2cd/m2
19.3cd/m2
19.9cd/m2
3.0V
3.0in2
100V (peak)
196Hz
NR040306
4
HV860
Figure 3: Typical Waveform on VA, VB, and Differential Waveform VA - VB
Split Supply Configuration
The HV860 can also be used for handheld devices operating necessary to run the internal logic is 200µA max. Therefore,
from a battery where a regulated voltage is available. This the regulated voltage could easily provide the current without
is shown in the Figure 4. The regulated voltage can be used being loaded down.
to run the internal logic of the HV860. The amount of current
Enable/Disable Configuration
The HV860 can be easily enabled and disabled via a logic microprocessor signal is high the device is enabled, and
control signal on the EN pin as shown in the Figure 4. The when the signal is low, it is disabled.
control signal can be from a microprocessor. When the
Figure 4: Split Supply and Enable/Disable Configuration
+
VIN
CIN
-
LX
D
RREG
2
VREG
VDD
3
5
CS
VREF LX
CS
7
10
12
Regulated Voltage = VDD
RSW
CDD
RSW-OSC
REL-OSC
EN
9
8
VA
VB
1
EL
Lamp
REL
On = 1.5V
Off = 0V
11
GND
4
HV860K7
NR040306
5
HV860
Audible Noise Reduction
The EL lamp, when lit, emits an audible noise. This is due The HV860 employs a proprietary circuit to help minimize
to EL lamp construction. The audible noise generated by the the EL lamp’s audible noise by using a single resistor, RREG
EL lamp can be a major problem for applications where the as shown in Figure 5.
EL lamp is held close to the ear, such as cellular phones.
,
Figure 5: Typical Application Circuit for Audible Noise Reduction
VIN
CIN
LX
D
RREG
2
3
5
CS
VREG
VDD
VREF LX
CS
10
12
7
VDD
RSW
CDD
RSW-OSC
REL-OSC
EN
9
8
VA
VB
1
EL
Lamp
REL
1.5V = On
0V = Off
11
GND
4
HV860K7
How to Minimize EL Lamp Audible Noise
The audible noise from the EL lamp can be minimized with to ground. EL lamp noise can be minimized without much
the proper selection of RREG. R
is connected between loss in brightness by setting the RC time constant to be
the VREF and VREG pins. VREG hasRaEnG internal 60pF capacitor approximately 1/12TH of the EL frequency’s period.
EL Lamp Dimming using PWM
This section describes the method of dimming the EL lamp. resistor. An n-channel open drain PWM signal is used to pull
Reducing the voltage amplitude at the VREG pin will reduce the 10kΩ resistor to ground. The effective voltage on the
the voltage on the VCS pin, which will effectively reduce the
V
pin will be proportional to the duty cycle of the PWM
peak the peak voltage the EL lamp sees. Figure 5 shows a siRgEnGal. The PWM operating frequency can be anywhere
circuit to dim the lamp by changing the duty cycle of a PWM between 20kHz to 100kHz.
signal. A 10kΩ resistor is connected in series with a 3.3MΩ
Figure 6: PWM Dimming Circuit
+
VIN
4.7μF
-
220μH
Open Drain
n-channel
PWM Signal
(Cooper Inductor SD3814-221)
10kΩ
3
VREF
3.3MΩ
5
LX
CS
2
BAS21
7
3.3nF
200V
VREG
VDD
10
12
+
-
1.0MΩ
2.0MΩ
VDD
0.1μF
RSW-OSC
REL-OSC
EN
9
8
VA
VB
1
EL Lamp
On = 1.5V
Off = 0V
11
GND
4
HV860K7
NR040306
6
HV860
12-Lead QFN Package Outline (K7)
0.73
0.85
1.25
1.65
All dimensions are in millimeters
Legend: min
max
0.73
0.85
Pin #1
1.25
1.65
3.00
1.55
2.40
0.18
0.30
0.30
0.50
0.5
3.00
Top View
θ ~ 14O
0.70
0.80
0.20
Side View
(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 its products for use in such applications, unless it receives an adequate
"product liability indemnification insurance agreement". Supertex 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 or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest
product specifications, refer to the Supertex website: http//www.supertex.com.
©2006 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited.
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 222-8888 / FAX: (408) 222-4895
Doc.# DSFP - HV860
www.supertex.com
NR040306
7
相关型号：
©2020 ICPDF网 联系我们和版权申明