IMP560 IMP560

IMP560
IMP560
POWER
MANAGEMENT
POWER
MANAGEMENT
Key Features
Power Efficient
EL Lamp Driver
◆ 112V peak-to-peak typical AC output voltage
The IMP560 is an Electroluminescent (EL) lamp driver designed for systems with low EL lamp drive voltage requirements. It is ideal for low
ambient light applications or where small lamps are used. With just onehalf the inductor current of the IMP803, the IMP560 reduces system
power consumption and extends battery life. Input supply voltage range
is 2.0V to 6.5V and quiescent current is a low 420µA. Typical EL lamp
drive voltage is ±56V.
All four EL lamp-driving functions are on-chip. These are the switchmode power supply, its high-frequency oscillator, the high-voltage
H-bridge lamp driver and its low-frequency oscillator. EL lamps of up to
6nF capacitance can be driven to high brightness.
The circuit requires few external components; a single inductor, a single
diode, two capacitors and three resistors. Two of these resistors set the
frequencies for two internal oscillators. An internal circuit shuts down
the switching regulator when the lamp drive voltage exceeds 120V
peak-to-peak. This conserves power and extends battery life.
A disable mode puts the chip into a low current drain mode. With a 3.0V
supply, quiescent current drops to 200nA maximum, 50nA typical. The
chip is disabled by connecting the oscillator frequency setting resistor
RSW to ground.
The IMP560 is available in MicroSO and SO-8 packages and in die or
wafer form.
Block Diagram
VDD
RSW-OSC
GND
◆ Low input current (w/inductor current)......12mA
◆ Low disabled input current......50nA
◆ Wide operating voltage range - from 2.0V to 6.5V
◆ Simple design requires few passive components
◆ Adjustable output lamp frequency controls lamp
color and power consumption
◆ Adjustable converter frequency for minimum
power consumption
◆ IMP803 pin-compatible
◆ MicroSO package option
Applications
◆
◆
◆
◆
◆
◆
◆
Night lights
Automotive displays
Cellular phones
Pagers
Clocks and radios
Portable GPS receivers
LCD module backlights
4
1
2
3
Switch
Oscillator
LX
CS
5
Q
+
7
C
Regulation
Control
IMP560
–
VREF
VA
Q
Bridge Output
Driver and
OSC
Q
6
REL-OSC
8
VB
Q
560_01.eps
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1
IMP560
IMP560
Pin Configuration
SO/MicroSO
VDD
1
RSW-OSC
2
CS
3
6
VB
LX
4
5
GND
IMP560
8
REL-OSC
7
VA
Pin Compatible With IMP803
560_02.eps
Ordering Information
Part Number
Input Voltage
Regulated Output Voltage
Temperature Range
Pins-Package
IMP560EMA
2.0V to 6.5V
YES
– 40°C to +85°C
8-MicroSO
IMP560ESA
2.0V to 6.5V
YES
– 40°C to +85°C
8-SO
IMP560/D*
2.0V to 6.5V
YES
25°C
Dice
IMP560/D1**
2.0V to 6.5V
YES
25°C
Dice
* Disable pad not active
** Disable pad active
Absolute Maximum Ratings
Supply Voltage, VDD, VRSW-OSC and VREL-OSC . . .
Output Voltage, VCS . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range . . . . . . . . . . . . .
Storage Temperature Range. . . . . . . . . . . . . . . .
Power Dissipation (SO) . . . . . . . . . . . . . . . . . . .
Power Dissipation (MicroSO) . . . . . . . . . . . . . .
–0.5V to +7.0V
–0.5V to +120V
–40°C to +85°C
–65°C to +150°C
400mW
300mW
Note: All voltages are referenced to GND.
These are stress ratings only and functional operation is not
implied. Exposure to absolute maximum ratings for prolonged
time periods may affect device reliability.
Electrical Characteristics
Unless otherwise noted, VDD = 3.0V, RSW = 750kΩ, REL = 2.0MΩ, and TA = 25°C.
Parameter
ON-resistance of MOS Switch
Output Voltage Regulation
Output Voltage Peak-to-peak (in regulation)
Quiescent VDD Supply Current, Disabled
Input Current at VDD Pin
Input Current at VDD Pin
Input Current: IDD Plus Inductor Current
VA-B Output Drive Frequency
Switching Frequency
Switching Duty Cycle
2
Symbol
RDS(ON)
VCS
VA-VB
IDDIS
IDD
IDD
IIN
fEL
fSW
DSW
Conditions
I = 100mA
VDD = 2.0 to 6.5V
VDD = 2.0 to 6.5V
VRSW-OSC < 100mV
VDD = 3.0V, See Figure 1
VDD = 5.0V, See Figure 2
VDD = 3.0V, See Figure 1
VDD = 3.0V, See Figure 1
VDD = 3.0V, See Figure 1
VDD = 3.0V, See Figure 1
© Daily Silver IMP
Min
52
104
300
50
Typ
Max
Units
3.5
56
112
50
470
500
12
370
70
88
8
65
120
200
700
750
Ω
V
V
nA
µA
µA
mA
Hz
kHz
%
430
90
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IMP560
IMP560
IMP560
Typical Characteristics
VCS, IIN vs. VIN
VCS, IIN vs. VIN
100
100
L = 100µH
L = 330µH
80
VCS (V), IIN (mA)
VCS (V), IIN (mA)
80
VCS
60
40
IIN
20
0
2.0
3.0
4.0
5.0
40
IIN
20
0
6.0
VIN (V)
VCS
60
2.0
3.0
650_03.eps
650_06.eps
L = 560µH
80
VCS (V), IIN (mA)
80
VCS (V), IIN (mA)
6.0
100
L = 470µH
VCS
60
40
IIN
20
2.0
3.0
4.0
5.0
VCS
60
40
IIN
20
0
6.0
VIN (V)
2.0
3.0
4.0
5.0
VIN (V)
650_04.eps
VCS, IIN vs. VIN
6.0
650_07.eps
IDD vs. VDD
800
100
L = 1mH
L = 560µH
700
80
VCS
IDD (µA)
VCS (V), IIN (mA)
5.0
VCS, IIN vs. VIN
VCS, IIN vs. VIN
100
0
4.0
VIN (V)
60
40
600
500
400
20
IIN
0
2.0
3.0
4.0
VIN (V)
© Daily Silver IMP
5.0
6.0
650_05.eps
300
2.0
3.0
4.0
5.0
VDD (V)
Electroluminescent Lamp Driver
6.0
650_8.eps
3
IMP560
IMP560
Pin Descriptions
Pin Number
Name
1
VDD
Function
2
RSW-OSC
Switch-mode resistor pin. Switching frequency is determined by an external resistor, RSW.
3
CS
Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the
voltage at CS.
4
LX
Connection to flyback inductance, L.
5
GND
6
VB
EL lamp drive. The lamp is connected in a high-voltage bridge circuit with VB providing
the complementary connection to VA. The peak-to-peak AC voltage across the EL lamp is
thus two times VCS.
7
VA
EL lamp drive. (See above)
8
REL-OSC
Positive voltage supply for the IMP560. Inductor L may be connected here or to a
separate unregulated supply.
Ground pin.
The EL lamp oscillator frequency setting pin. The oscillator frequency is controlled
by external resistor REL.
External Components
External Component
Diode
Description and Selection Guide
A fast reverse recovery diode, with BV > 100, such as a 1N4148.
Capacitor CS
This is the high voltage capacitor that stores the inductive energy transferred through the
diode. A 100 volt capacitor between 10nF and 100nF is recommended.
Resistor R EL
The EL lamp oscillator frequency setting resistor. This resistor, connected between the
REL-OSC pin and ground, provides an oscillator frequency inversely proportional to REL;
as REL increases, the EL lamp frequency decreases along with the current drawn by the lamp.
Lamp color is also determined by this frequency. A 2MΩ resistor between the REL-OSC pin and the
VDD supply results in a lamp frequency around 350Hz: a 1MΩ resistor will give ≈700Hz.
Resistor RSW
Switching Oscillator frequency setting resistor. The switching oscillator resistor is connected
between the RSW-OSC pin and the VDD supply. The switching frequency is inversely proportional
to the resistor value, dropping as the resistance increases.
Inductor L
The inductor provides the voltage boost needed by means of inductive “flyback”. The internal
MOSFET switch alternately opens and closes the ground connection for the inductor at the
LX pin. When this internal switch opens, the inductor potential will forward-bias the diode
and the current will pass through the storage capacitor CS, charging it to a high voltage.
Smaller inductors are preferred to prevent saturation. As the value of the inductor
increases (and the series DC resistance of the inductor decreases), the switching frequency
set by RSW should be increased to prevent saturation. In general, smaller value inductors that
can handle more current are more desirable when larger area EL lamps must be driven.
High–Voltages Present
The IMP560 generates high voltages and caution should
be exercised.
4
© Daily Silver IMP
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IMP560
IMP560
IMP560
Application Information
Test and Application Circuit, 3.0V
Figure 1 shows the IMP560 configured to drive a 3-square-inch
EL lamp, represented as a 10nF capacitor.
ON = VDD
2MΩ
OFF = 0V
REL-OSC
8
2 RSW-OSC
VA
7
3 CS
VB
6
4 LX
GND
5
1 VDD
750kΩ
560µH1
10nF
Equivalent to
3 in2 lamp
1N4148
+
VIN = 3.0V
L
–
IMP560
0.1µF
100V
0.1µF2
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
560_09.eps
Figure 1. 3.0V Application
Test and Application Circuit, 5.0V
Figure 2 shows a 5.0V input application driving a 6-square-inch
EL lamp.
ON = VDD
2MΩ
OFF = 0V
1 VDD
REL-OSC
8
VA
7
750kΩ
560µH1
L
2 RSW-OSC
6 in2 lamp
+
VIN = 5.0V
3 CS
VB
6
4 LX
GND
5
1N4148
–
0.1µF2
0.1µF
100V
IMP560
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
560_10.eps
Figure 2. 5.0V Application
© Daily Silver IMP
Electroluminescent Lamp Driver
5
IMP560
IMP560
Enable/Disable Operation
Figure 3 shows the IMP560 can be enabled via a logic gate that connects RSW to VDD, and disabled by connecting it to ground. REL may
be connected either to VDD or to the gate.
Enable/Disable Table
RSW Connection
VDD
Ground
CMOS
Gate
ON = VDD
IMP560 State
Enabled
Disabled
REL
OFF = 0V
1 VDD
REL-OSC
8
2 RSW-OSC
VA
7
3 CS
VB
6
4 LX
GND
5
RSW
L1
EL lamp
1N4148
+
VIN
–
0.1µF2
15V
IMP560
0.1µF
100V
Note:
1. Murata part # LQH4N561K04 (DC resistance <14.5 Ω)
2. Larger values may be required depending upon supply impedance.
560_11.eps
Figure 3. Enable/Disable Operation
Dual Supply Operation with 1.5V Battery
The IMP560 can also be operate from a single battery cell when a
regulated voltage higher than 2.0V is also available. The dual
supply configuration, shown in Figure 4, uses the regulated
voltage to operate the IMP560 while the energy for the highvoltage boost circuit comes from the battery. The current to run
the internal logic is typically 420µA.
The circuit of Figure 4 can also be used with batteries that exceed
6.0V as long as VDD does not exceed 6.5V.
Regulated Voltage
(2.0V to 6.5V)
ON = VDD
REL
OFF = 0V
1 VDD
REL-OSC
8
2 RSW-OSC
VA
7
3 CS
VB
6
4 LX
GND
5
RSW
L
EL lamp
Battery
Voltage
VIN
1N4148
+
–
0.1µF*
CS
0.1µF
100V
IMP560
* Larger values may be required
depending upon supply impedance
560_12.eps
Figure 4. Dual Supply Operation with High Battery Voltages
6
© Daily Silver IMP
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IMP560
IMP560
IMP560
Package Dimensions
Inches
SO (8-Pin)
0°– 8°
Millimeters
M in
Max
0.053
0.004
0.013
0.007
0.069
0.010
0.020
0.010
Min
Max
1.35
0.10
0.33
0.19
1.75
0.25
0.51
0.25
SO (8-Pin)*
L
N
E
H
C
D
A
A
A1
B
C
e
E
H
L
D
1.27
0.050
0.150
0.228
0.016
0.189
0.157
0.244
0.050
0.197
3.80
5.80
0.40
4.80
4.00
6.20
1.27
2.00
MicroSO (8-Pin)**
e
B
A1
SO (8-Pin).eps
MicroSO (8-Pin)
a
+
E1 E
L
A
–––––
0.0433
0.0059
0.0020
A1
A2
0.0295
0.0374
b
0.0098
0.0157
C
0.0051
0.0091
0.1220
0.1142
D
e
0.0256 BSC
E
0.193 BSC
E1
0.1142
0.1220
0.0276
0.0157
L
a
0°
6°
* JEDEC Drawing MS-012AA
** JEDEC Drawing MO-187AA
––––
1.10
0.15
0.050
0.75
0.95
0.25
0.40
0.13
0.23
3.10
2.90
0.65 BSC
4.90 BSC
2.90
3.10
0.70
0.40
0°
6°
803_t01.at3
D
C
A2
D
A
e
b
© Daily Silver IMP
0.10mm
0.004in
MicroSO (8-Pin).eps
A1
Electroluminescent Lamp Driver
7
IMP560
Daily Silver IMP Microelectronics Co.,Ltd
7 keda Road , Hi-Tech Park,
NingBo,Zhejiang, P.R.C.
Post Code : 315040
Tel:(086)-574-87906358
Fax:(086)-574-87908866
e-mail:[email protected]
Website:www.ds-imp.com.cn
The IMP logo is a registered trademark of Daily Silver IMP.
All other company and product names are trademarks of their respective owners.
IMP560
2005 Daily Silver IMP
Revision : A
Issue Date: 08/08/05
Type: Product