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PDF IMP522 Data sheet ( Hoja de datos )
| Número de pieza | IMP522 | |
| Descripción | Dual EL Lamp Driver | |
| Fabricantes | IMP Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IMP522 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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IMP522
POWER MANAGEMENT
ADVANCE PRODUCT INFORMATION
Dual EL Lamp Driver
The IMP522 is a dual-output, high-voltage electroluminescent (EL) lamp
driver. Either or both EL lamp driver outputs can be turned ON with the
LMPSEL select pin. One EL lamp is connected between VA and VAB and
the other is connected between VB and VAB. VAB is a common pin for both
lamps. With an input supply voltage between 2.0V and 6.5V, the typical
regulated lamp drive voltage is 220V peak-to-peak.
The device uses a single inductor and a minimum number of passive
components: a storage capacitor, a fast recovery diode and two resistors
to set the PWM and EL drive frequencies. These can be independently
set to optimize brightness and minimize power consumption. RSW is
connected between the RSW-OSC pin and the supply pin VDD to set the
frequency for the internal 4.0Ω switching MOSFET. The switch duty cycle
is 88%. The EL lamp driver frequency is set by REL connected between the
REL-OSC pin and the VDD pin.
Designed to minimize battery current drain, the IMP522 draws 2mA maxi-
mum. A power-saving shutdown mode reduces current to 2µA maximum.
The IMP522 is available in a compact 10-pin MicroSO package and in die form.
Block Diagram
Key Features
N Drive two EL lamps independently
N Digital LMPSEL pin
— Activate either or both EL output drivers
N 220VP-P typical AC output voltage drives
30nF EL lamps
N Wide operating voltage range: 2V to 6.5V
N Low current consumption: 2mA maximum
N Disable mode extends battery life
— Disable current 2µA maximum
N Compact 10-pin MicroSO package
N High-voltage, low-cost CMOS process
Applications
N Cellular phones
N PDAs/Handheld computers
N Toys/Consumer electronics
N Safety Illumination
N LCD modules
N Remote controls
LX (4)
(2) RSW-OSC
Switch
Oscillator
Regulation
Control
CS (3)
(1) VDD
(9) LMPSEL
VREF
Select
A Lamp
Three-Level Detector Select
B Lamp
VDD
Dual
Bridge
Driver
VA (8)
VAB (7)
(10) REL-OSC
(6) GND
© 2001 IMP, Inc.
Lamp
Drive
Oscillator
408-432-9100/www.impweb.com
VB (5)
522_01.eps
1
1 page  
IMP522
Application Information
Power Sequencing
To power up the chip, the RSW-OSC pin is connected to VDD through
the external RSW resistor. The voltage on the pin will charge up to
VDD/2. An internal threshold detector circuit monitors the pin
voltage and when it exceeds the threshold range (0.2V to 0.9V) it
powers up the oscillator and internal bias modules. This starts a
delay counter which is one half of the EL oscillator period, after
which power to the high voltage internal modules is applied. The
IMP522 is then operating fully.
To power down the chip, RSW is driven to ground via a switch or
logic gate. When the voltage on the driver side of the resistor falls
below VDD/2, there will be no input bias current into the RSW-OSC
pin. This immediately powers down the internal high-voltage
circuits, which effectively shuts the lamp off. At this point the
oscillator and bias modules still draw quiescent current, but oscil-
lations have ceased. As the RSW-OSC pin voltage falls below 0.1, the
oscillator and bias modules are also fully powered down.
IN (Pulse)
ILX
VLX
Figure 1. Driver Waveforms
522_03.eps
Power Saving Disable Mode
The IMP522 can be powered up and down with RSW-OSC. In
normal operation, this resistor on the RSW-OSC pin is connected to
VDD or another voltage source. To power down (disable) the
IMP522, RSW is connected to ground.
When disabled, the IMP522 quiescent current drops to typically 20nA.
In die form, an extra pin ENABLE is available (contact factory).
Connecting this pad to VDD disables the chip. The ENABLE signal
can be driven by a microcontroller.
Oscillator Frequency Adjustment
The EL lamp drive and PWM boost converter oscillation frequen-
cies can be programmed independently.
The RSW resistor, connected between the RSW-OSC pin and VDD,
determines the Inductor Switching (or PWM-) frequency. For the
recommended nominal resistor value of 910kΩ, the frequency is
61kHz. For other resistor values, the frequency is inversely pro-
portional to the resistor value. Increasing the resistance will lower
the frequency.
The REL resistor, connected between the REL-OSC pin and VDD,
determines the EL lamp drive frequency. For the recommended
nominal resistor value of 2.7MΩ, the frequency is 250Hz. For
other resistor values, the frequency is inversely proportional to
the resistor value: increasing the resistance will lower the fre-
quency.
Oscillator
EL Lamp Drive
Inductor Switch (PWM)
Nominal
Resistor
REL = 2.7MΩ
RSW = 910kΩ
Nominal
Frequency
250Hz
61kHz
522_t03.eps
© 2001 IMP, Inc.
Electroluminescent Lamp Drivers
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet IMP522.PDF ] | |
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