IMP525EMA/T [ETC]
Interface IC ; 接口IC\n
| 型号： | IMP525EMA/T |
| 厂家： | 
ETC |
| 描述： | Interface IC
|
| 文件： | 总8页 (文件大小：151K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IMP525
P
OWER
M
ANAGEMENT
Key Features
Single Cell Battery Powered
Electroluminescent Lamp
Driver/Inverter
ꢀ Wide operating voltage range - from 0.9V to 2.5V
ꢀ Simple design requires few passive components
ꢀ 112V peak-to-peak typical AC output voltage
The IMP525 is an Electroluminescent (EL) lamp driver designed for sys-
tems that must operate down to 1 volt and below. The input supply volt-
age range is 0.9V to 2.5V. Typical output lamp drive voltage is 112V. All
four EL lamp-driving functions are on-chip. These are the switch-mode
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.
ꢀ Adjustable output frequency controls lamp
color and power consumption
ꢀ Adjustable converter frequency minimizes
circuit power consumption
ꢀ Disable mode extends battery life
ꢀ Disable current 1µA typical
The circuit requires few external components; one inductor, one diode,
one capacitor and two resistors. The resistors set the frequency for the
two oscillators.
ꢀ Compact MicroSO package option
A disable mode puts the chip into a low current-drain state. When dis-
abled, quiescent current drops to 1µA typical with a VDD of 1.5V. The chip
can be disabled by connecting RSW, the oscillator frequency setting
resistor, to ground. A disable pad (active low), accessible only on the die,
can also be used to disable the driver.
Applications
ꢀ Audio/TV remote control units
ꢀ Pagers/Cellular phones
ꢀ PDAs
An internal circuit shuts down the switching regulator when the lamp
drive voltage exceeds 112V peak-to-peak. This conserves power and
extends battery life.
ꢀ Clocks and radios
ꢀ Portable GPS receivers
ꢀ LCD modules
The IMP525 is available in MicroSO and SO-8 packages and in die form.
ꢀ Toys
Block Diagram
4
1
VDD
LX
3
2
5
Switch
Oscillator
RSW-OSC
CS
GND
Q
+
–
7
V
C
A
Regulation
Control
VREF
Q
Bridge
Output
Driver
IMP525
Q
Q
6
VB
8
Lamp Drive
Oscillator
REL-OSC
525_01.eps
© 2000 IMP, Inc.
408-432-9100/www.impweb.com
7
IMP525
Pin Configuration
SO/MicroSO
VDD
RSW-OSC
CS
1
2
3
4
8
7
6
5
REL-OSC
IMP525
V
A
VB
LX
GND
525_02.eps
Ordering Information
Part Number
IMP525EMA
IMP525ESA
IMP525/D*
Input Voltage
Regulated Output Voltage Temperature Range
Pins-Package
8-MicroSO
8-SO
0.9V to 2.5V
0.9V to 2.5V
0.9V to 2.5V
0.9V to 2.5V
YES
YES
YES
YES
–40°C to +85°C
–40°C to +85°C
25°C
Dice
IMP525/D1**
25°C
Dice
* Disable pad not active
** Disable pad active
Add /T to ordering part number for Tape and Reel.
Absolute Maximum Ratings
Supply Voltage, VDD, VRSW-OSC and VREL-OSC . . –0.5V to +3.5V
Note: All voltages are referenced to GND.
Storage Temperature Range . . . . . . . . . . . . . . . . – 65°C to +150°C
Power Dissipation (SO package) . . . . . . . . . . . . 400mW
Power Dissipation (MicroSO package) . . . . . . . 300mW
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 = 1.5V, RSW = 1MΩ, REL = 1.0MΩ, and TA = 25°C.
Parameter
Symbol Conditions
Min
TypMax
Units
ON-resistance of MOS Switch
RDS(ON)
I = 50mA
15
2.5
65
Ω
V
Operating Voltage
0.9
52
Output Voltage at CS
VCS
VCS
VDD = 1.5V, See Figure 1, Table 1
VDD = 0.9V, See Figure 1, Table 2
VDD = 1.5V, See Figure 1
Disable = HIGH
58
50
V
Output Voltage at CS
V
Output Voltage Peak-to-Peak
Quiescent VDD Supply Current, Disabled
(Disable pin available on die only)
Quiescent VDD Supply Current, Disabled
VA-VB
IQDIS
104
112
70
124
2.0
VP-P
nA
IQDIS
RSW-OSC = GND
1.0
µA
VDD = 1.5V
Input Current at VDD Pin
IDD
IIN
VDD = 0.9V to 1.5V
1.5
32
mA
mA
Hz
kHz
%
Input Current: IDD Plus Inductor Current
VA-B Output Drive Frequency
Boost Converter Switching Frequency
Switching Duty Cycle
VDD = 1.5V
23
500
26
fEL
VDD = 1.5V, See Figure 1, Table 1
VDD = 1.5V, See Figure 1, Table 1
VDD = 1.5V, See Figure 1
fSW
DSW
VDISL
87.5
Disable Input LOW Voltage
GND
0.2
V
(Disable pin available on die only)
Disable Input HIGH Voltage
VDISH
VDD-0.5V
VDD
V
(Disable pin available on die only)
ꢀ
© 2000 IMP, Inc.
8
408-432-9100/www.impweb.com
IMP525
Typical Characteristics
Boost Converter
EL Lamp Drive Frequency
Switching Frequency
2400
2000
1600
1200
800
400
0
150
125
100
75
V
= 1.5V
= 25°C
V
= 1.5V
= 25°C
DD
DD
T
T
A
A
50
25
0
0
0.5
1.0
1.5
(MΩ)
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
R
R
(MΩ)
525_10.eps
525_08.eps
SW
EL
Boost Converter
Switching Period
EL Lamp Drive Period
8
7
6
5
4
3
2
1
0
100
75
50
25
0
V
= 1.5V
= 25°C
V
= 1.5V
= 25°C
DD
DD
T
T
A
A
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0
0.5
1.0
1.5
R (MΩ)
SW
2.0
2.5
3.0
R
(MΩ)
525_07.eps
525_09.eps
EL
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
9
IMP525
Pin Descriptions
Pin Number
Name
VDD
Function
1
Positive voltage supply for the IMP525. Inductor L may be connected here or to a
separate supply.
2
3
RSW-OSC
CS
Switch-mode resistor pin. Switching frequency is determined by external resistor RSW,
connected between pin 2 and VDD
.
Boost converter storage capacitor. The voltage across the EL lamp is equal to twice the
voltage at CS.
4
5
6
LX
GND
VB
Connection to flyback inductance, L.
Ground pin.
EL lamp drive. The lamp is connected to a high-voltage bridge circuit with VB providing
the complementary connection to V .
A
7
8
V
EL lamp drive. (See above)
A
REL-OSC
The EL lamp oscillator frequency-setting pin. The frequency is controlled by resistor REL
,
connected from pin 8 to VDD
.
Disable Pad
DIS
Available only in die form. Setting DIS HIGH disables the chip.
External Components
External Component
Diode
Description and Selection Guide
A fast reverse recovery diode, with BV > 100, such as a 1N4148.
Capacitor CS
The high voltage capacitor that stores the inductive energy transferred through the
catch diode. A 100 volt capacitor between 10nF and 100nF is recommended.
Resistor REL
Resistor RSW
The EL lamp oscillator frequency-setting resistor. REL is connected between pin 8 and VDD,
providing a 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 1MΩ resistor between the REL-OSC pin and the VDD supply results in a lamp
frequency around 500Hz.
Switching Oscillator frequency-setting resistor. RSW 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.
Capacitor CSW
Inductor L
This is an optional noise-suppression capacitor connected from ground to the RSW-OSC pin.
A 100pF capacitor is recommended.
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 the switch opens, the inductor potential will forward-bias the diode
and the current will pass through to the storage capacitor CS, charging it to a high voltage.
As the value of the inductor is increased, the switching frequency set by RSW should also 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.
A small electrolytic capacitor (10µF, 16V), normally present across the inductor supply VIN,
will likely eliminate the need for CSW
.
ꢀ
10
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
IMP525
Application Information
Test Circuit
Figure 1 shows the IMP525 configured to drive an EL lamp,
represented as a 3nF capacitor.
ON = VDD
OFF = 0V
REL
1
2
3
4
VDD
RSW-OSC
CS
REL-OSC
8
7
6
5
RSW
L
V
A
3nF
D
VB
1N4148
+
LX
GND
VDD
–
0.1µF
100V
CSW
*
0.1µF1
CS
IMP525
0.1nF
Note:
525_03.eps
1. Larger values may be required depending upon supply impedance.
* Optional
Figure 1. Test Circuit
Table 1. VIN = 1.5V
Component
Connections
VDD, RSW-OSC
VDD, REL-OSC
Value
1MΩ
1MΩ
330µH2
0.1µF/100V
1N4148
0.1nF
Description
RSW
REL
L
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
2
VDD, LX
CS
D
CS, GND
LX, CS
Boost converter storage capacitor
Switching diode
CSW
RSW-OSC, GND
Noise-suppression capacitor
Notes. 2. Murata LQH4N331K04 (8.2Ω max. DCR)
Table 2. VIN = 0.9V
Component
Connections
VDD, RSW-OSC
VDD, REL-OSC
Value
1.0MΩ
Description
RSW
REL
L
Boost converter oscillator bias resistor
EL lamp driver oscillator bias resistor
Boost converter inductor
2.62MΩ
680µH3
0.1µF/100V
1N4148
0.1nF
3
VDD, LX
CS
D
CS, GND
LX, CS
Boost converter storage capacitor
Switching diode
CSW
RSW-OSC, GND
Noise-suppression capacitor
Notes. 3. Coilcraft DS1608C-684 (2.2Ω max. DCR)
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
11
IMP525
Enable/Disable Operation
Figure 2 shows how the IMP525 can be enabled via a logic gate that
connects RSW to VDD, and disabled by connecting it to ground.
The IMP525 can also be disabled using a pad on the die. The
Disable function pin is not available in packaged parts.
Disable PAD Connection
(Available only with dice)
Enable/Disable Table
IMP525 State
RSW Connection
IMP525 State
HIGH (VDD
)
Disabled
Enabled
VDD
Ground
Enabled
Disabled
LOW (Ground)
CMOS
Gate
ON = VDD
OFF = 0V
REL
1
2
3
4
VDD
REL-OSC
8
RSW
L1
RSW-OSC
CS
V
7
6
5
A
EL lamp
D
VB
1N4148
+
VDD
–
LX
GND
IMP525
0.1µF
100V
CSW*
0.1nF
0.1µF2
CS
Note:
1. Murata part # LQH4N331K04 (DC resistance < 8.2 Ω)
2. Larger values may be required depending upon supply impedance.
525_04.eps
* Optional
Figure 2. Enable/Disable Operation
High Voltages Present
The IMP525 generates high voltages and caution should
be exercised.
Inductor Manufacturers
Manufacturer
Toko
Series
USA Phone Number
(847) 297-0070
D52FU
Coilcraft
DS1608, DO1608, DT1608
(847) 639-6400
River Electronics FLC32
(310) 320-7488
Murata
LQH4N
(800) 831-9172
ꢀ
© 2000 IMP, Inc.
12
408-432-9100/www.impweb.com
IMP525
MicroSO (8-Pin)
Package Dimensions
a
Inches
Millimeters
Min
Max
Min
Max
MicroSO (8-Pin)
A
–––––
0.0020
0.0295
0.0098
0.0051
0.1142
0.0433
0.0059
0.0374
0.0157
0.0091
0.1220
––––
0.050
0.75
0.25
0.13
2.90
1.10
0.15
0.95
0.40
0.23
3.10
A1
A2
b
E1 E
C
D
e
0.0256 BSC
0.193 BSC
0.65 BSC
4.90 BSC
L
E
D
E1
L
0.1142
0.1220
0.0276
6°
2.90
0.40
0°
3.10
0.70
6°
C
A2
A
0.0157
a
0°
SO (8-Pin)
0.10mm
0.004in
e
MicroSO (8-Pin).eps
A
A1
B
C
e
0.053
0.004
0.013
0.007
0.069
0.010
0.020
0.010
1.35
0.10
0.33
0.19
1.75
0.25
0.51
0.25
A1
b
0.050
1.27
E
H
L
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
5.00
SO (8-Pin)
D
0°– 8°
L
N
H
E
C
D
A
e
SO (8-Pin).eps
B
A1
© 2000 IMP, Inc.
Electroluminescent Lamp Driver
13
IMP525
IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: 408-432-9100
Fax: 408-434-0335
e-mail: info@impinc.com
http://www.impweb.com
©
2000 IMP, Inc.
Printed in USA
Publication #: 2002
Revision:
Issue Date:
Type:
B
The IMP logo is a registered trademark of IMP, Inc.
07/11/00
Product
All other company and product names are trademarks of their respective owners.
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