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MC33441 Electroluminescent Lamp Driver IC
The MC33441 is a DC-AC inverter integrated circuit for driving EL lamps. It can boost the supply voltage to the level required by EL lamps and also provide high voltage AC lamp excitation. It consists of an oscillator, a frequency divider, a coil driving circuit and a switched H-bridge network. The input supply voltage range is from 1.8V to 3.5V and is capable to supply a typical 140Vpp AC output voltage. The standby current of the device is typically 10nA which is ideal for low power portable products. Externally, one inductor and one resistor are needed to generate the desirable voltage charge and to fine tune the oscillator's frequency. This device is offered in 8-Pin TSSOP miniature package. The operating temperature is -20C to 70C.
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* * * * * *
Battery Operation 1.8V - 3.5V Typical Voltage Output 140Vpp Typical Standby Current 10nA Internal Oscillator with External Tuning Resistor Enable Control Pin with a 300K Internal Pull-Down Resistor 8-Pin TSSOP Package (Thickness = 1.05mm, Width = 4.5mm, Length = 3.1mm & Lead Pitch = 0.65mm)
TSSOP-8 DTB SUFFIX CASE 948J
PIN CONNECTIONS AND MARKING DIAGRAM
VDD 1 ENB 2 RT1 3 VSS 4 (Top View) A L Y W = Assembly Location = Wafer Lot = Year = Work Week M33 441 ALY W
8 EL1 7 EL2 6 FILTER 5 COIL
Types of Applications:
* Pagers, Cellular Phones, Portable CD Players/Minidisks * Databanks, Calculators
Simplified Block Diagram
VDD ENB RT1 VSS
1 2 OSC 3 4 FEL H-BRIDGE
8 7 6 5
EL1 EL2
ORDERING INFORMATION
FILTER COIL Device MC33441DTBR2 Package TSSOP-8 Shipping 2500 Units / Reel
FREQUENCY DIVIDER
FCOIL
COIL DRIVER
(c) Semiconductor Components Industries, LLC, 2000
1
April, 2000 - Rev. 1
Publication Order Number: MC33441/D
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Pin No. (TSSOP-8) Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2 Pin 1 Name COIL Filter VDD ENB VSS RT1 EL1 EL2 EL lamp driver output 1 EL lamp driver output 2 EL Filter Coil/Inductance input Analog/Power ground Internal oscillator's fine tuning resistance input Enable the whole device to operate Input voltage supply
REXT
VDD
ENB
VSS
RT1
1
2
3
4
OSC & FREQ. DIVIDER
FCOIL
FEL
PIN FUNCTION DESCRIPTION
Figure 1. Test Circuit
COIL DRIVER
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AND2 AND2 AND2
MC33441
2 H-BRIDGE MAIN SWITCH 5 Description 8 7 6 COIL FILTER EL1 EL2 EL LAMP Battery / VDD CFILTER INDUCTOR OPTIONAL
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DC ELECTRICAL CHARACTERISTICS (VDD = 2.65V, TA = 25C, Lamp Capacitance = 2.2nF, Coil = 1mH unless MAXIMUM RATINGS (TC = 25C, unless otherwise noted.)
otherwise noted.) EL Lamp Capacitance Range Coil Drive Clock Duty Cycle Coil Drive Frequency ( Fosc Divide by 4) Lamp Drive Frequency (Fosc Divide by 384) Clock Frequency (REXT = 125KW) Standby Current (VDD = 3.0 V, ENB = 0) Average Coil Current from Battery (1.8V < VDD 3.5 V) Peak Coil Current (1.8V < VDD 3.5 V) Output Voltage (1.8V < VDD 3.5 V) Supply Voltage Thermal Resistance, Junction-to-Air Power Dissipation Storage Temperature Range Operating Ambient Temperature Operating Junction Temperature Digital Input Voltage Range Power Supply Voltage Rating Characteristic
VEL2
VEL1
VEL
Figure 2. Output Waveform
LOGIC = 0 LOGIC = 1
TJ(max)
Symbol
RJA
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VDD Tstg PD TA
MC33441
3 -50 to +150 -20 to +70 DCCOIL Symbol ISTAND FCOIL 0.5 VDD ICOIL Max IVDD 178 300 150 Fosc VDD CEL 7.5 VEL FEL C/W Unit mW C C C V V Min 120 112 1.8 - - - - - - - 364.6 Typ 140 140 2.2 75 35 10 35 70 - Max 168 100 150 160 3.5 75 Typical Vpp = 140V (160V max) - - - - mA dc avg TIME TIME TIME Unit kHz kHz mA Hz nA nF % V V
MC33441
VDD = 2.65V Lamp Freq. = 365Hz EL Lamp = 2.2nF
X = 1ms/div, Y = 50V/div
Figure 3. Output Waveform vs. Time
OPERATING DESCRIPTION
General
The MC33441 is a DC-AC inverter integrated circuit for driving EL lamps. It can boost the supply voltage to the level required by EL lamps and also provide high voltage AC lamp excitation. It consists of an oscillator, a frequency divider, a coil driving circuit and a switched H-bridge network. The input supply voltage range is from 1.8V to 3.5V and is capable to supply a typical 140Vpp AC output voltage. The standby current of the device is typically 10nA which is ideal for low power portable products. Externally, one inductor and one resistor are needed to generate the desirable voltage charge and to fine tune the oscillator's frequency. This device is offered in 8-Pin TSSOP packages. The operating temperature is -20C to 70C.
Oscillator and Frequency Divider
F
OSC
+
1 6 R EXT C INT
Hz
+ 1.667 R
10 10 Hz
EXT
FCOIL = FOSC FEL = FOSC Coil Driver
B 384
B4
where CINT is about 10pF.
Two circuits are put together to form the oscillator. They are Vref and Ibias. The functionality of Vref block is to generate a zero temperature coefficient (TC) voltage reference which is about 1.27V. This 1.27V will then be used in Ibias circuit to provide current biasing to all of the internal circuits with the value equal to Vref divided by an internal resistor. Besides of that, an external resistor is also connected to this circuit block for setting the oscillator's frequency. The temperature coefficient is dominated by the value of that resistor. Therefore, if a low TC resistor is used, the oscillator frequency's TC can be kept low. The current mirrors with the induced current equal to the Vref divided by an external resistor are used to charge and discharge an internal capacitor to provide a 50% duty cycle clock signal. This original clock pulse will then be fed into the frequency divider which will generate two additional clock signals with different frequency and duty cycle to the coil-driver and the H-bridge circuits. The oscillator frequency is governed by the following equation:
The coil driver is basically a simplified boost converter. It takes a higher frequency clock signal from the frequency divider to turn on/off the main switch alternatively. When the main switch is on, current will flow through the coil to ground. Once the switch is being turned off, the energy stored in the coil will be released to the external capacitor (EL lamp) through an internal diode. According to the frequency of the clock signals between the coil driver and the H-bridge, the external capacitor (EL lamp) will be charging to the desirable level. Current limit circuit (typical 70mA & max. 150mA) is implemented in this device. Since the current through the coil will increase corresponding to the input voltage, if the input voltage is high and the inductance of the coil is small, the coil can be saturated. The current limit feature is used to avoid this happen. The main switch is parallel to a much smaller switch which has their collector and their base connected together. However, the emitter of the smaller switch is tied to a sensing resistor while the emitter of the main switch is connected to ground. The coil current will split into two according to the sizing ratio between the main and the smaller switch. The current through the smaller switch will also flow through the sensing resistor and generates a voltage. If the voltage across this sensing resistor is above the pre-set value, then both switches
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MC33441
will be turned off and the energy will release to the EL lamp. And, those switches will remain off until the next clock cycle.
H-Bridge Network
To achieve the 140V peak-to-peak voltage, H-bridge network is used to charge and discharge the EL lamp. The switching frequency of the bridge network is controlled by a clock signal from the divider with its frequency much lower than the one to the coil-driver. Moreover, to reduce the current consumption, the biasing current to the two low-side switches of the H-bridge is not activated until the coil-driver circuit needed to release the energy to the EL lamp. Then, the biasing circuit will be on and be ready before the main switch in the coil-driver really starts to turn off.
External Components
Moreover, if a low TC resistor is used, the oscillator frequency's TC can be kept low. The filter capacitor is to provide a smooth and more stable output waveform for the EL lamp. The value of this capacitor depends on the input voltage and the coil's inductance value. Equations below can be used to estimate filter capacitor's value at different input voltage.
Best Case Approximation for the Filter Capacitor: C FILTER
+ 0.026
(V
in
* VSW)
2
(L
F
2
OSC
)
Worst Case Approximation for the Filter Capacitor: C FILTER
+ 0.085
(V
in
* VSW)
2
(L
F
2
OSC
)
System designer will base on the application to decide the size and the type of the EL lamp to be used. The external resistance (REXT) at RT1 pin determines the excitation frequency (FEL) for the lamp. The relationship between REXT and the frequency is:
FEL = FOSC
where VIN is the input voltage, VSW is voltage across the switch when it is on, L is the coil's value and FOSC is the clock frequency. Measurement below is recorded with the condition: coil = 1mH, EL lamp = 2.2nF and at room temperature.
Table 1: Reference for CFILTER
B 384
By substitute the equation of FOSC from Oscillator & Frequency Divider.
F EL
+
4.341 10 7 Hz R EXT
so R EXT
+ 4.341 F
EL
10 7 W
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1.8V 2.0V 2.5V 3.0V 100K-130KW 100K-130KW 100K-130KW 100K-130KW 5n-10nF 10n-22nF 10n-22nF 22nF-33nF
VDD
REXT
CFILTER
MC33441
TYPICAL OPERATING CHARACTERISTICS
300 250 OSC. FREQ. (KHz) 200 150 100 50 0 50K VDD = 2.65V Coil = 1mH EL lamp = 2.2nF LAMP FREQ. (Hz) 700 600 500 400 300 200 100 75K 100K REXT (OHM) 150K 200K 0 50K 75K 100K REXT (OHM) 150K 200K VDD = 2.65V Coil = 1mH EL lamp = 2.2nF
Figure 4. Oscillator Frequency vs. REXT
Figure 5. Lamp Frequency vs. REXT
25 20 15 10
30 25 20
I (mA)
I (mA) VDD = 2.65V Lamp Freq. = 365Hz EL lamp = 2.2nF 0.82 1 COIL INDUCTANCE (mH) 1.33 1.47
15 10
5 0 0.56
5 0 1.8
Coil = 1mH Lamp Freq. = 365Hz EL Lamp = 2.2nF 2 2.65 VDD (V) 3 3.5
Figure 6. Current Consumption vs. Coil Inductance
Figure 7. Current Consumption vs. VDD
138 136 134 132 VOUT (V) 130 128 126 124 122 120 50K 75K 100K REXT (OHM) VDD = 2.65V Coil = 1mH EL Lamp = 2.2nF 150K 200K VOUT (V)
150 145 140 135 130 125 120 115 110 0.56 VDD = 2.65V Lamp Freq. = 365Hz EL Lamp = 2.2nF 0.82 1 COIL INDUCTANCE (mH) 1.33 1.47
Figure 8. Output Voltage vs. REXT
Figure 9. Output Voltage vs. Coil Inductance
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MC33441
APPLICATION INFORMATION
EL Lamp Selection
EL lamps are a laminate which exhibit a capacitance on the order of 2.5nF to 3.5nF per square inch. The light will emit as the high voltage is applied across the electrodes of this capacitance. The color of the emitted light is determined by the type of chemical used and the frequency of the excitation voltage. On the other hand, the lamp brightness increases approximately the square of the applied voltage and nearly linear to the excitation frequency. Once a lamp has been selected, the operating frequency and the essential voltage for the optimum performance is determined. Then, the driver circuit can begin to design.
Inductor Selection (L1)
The inductor must have a saturation current rating equal to or bigger than the peak coil current which is 150mA.
Filter Capacitor Selection (C2)
See Table 1 for the estimated value of the filter capacitors based on the input voltage supply. Since the maximum voltage of the filter capacitor can reach 70V or even 80V, capacitor with high voltage rating will be required.
Resistor Selection (R1)
Use a 1mH/0.15A inductor for MC33441. Higher inductor values can be used to reduce the peak transient coil current from the battery supply. As the value of the inductor (L1), increases, the resistor (R1) value may need to increase correspondingly to provide optimum performance. While a lower inductor values lead to smaller physical size, it will generate a higher peak coil current. A lower resistor (R1) value should be used when a lower inductance coil is being used.
Since the fundamental frequency of the oscillator is set by the external resistor (R1), the temperature coefficient of the frequency is dominated by the value of this resistor. A low temperature coefficient (TC) resistor is suggested to use for keeping the variation of oscillator's frequency low against the operation temperature range. (See Page 4, Fig. 3 & Fig. 4)
R1
+ REXT + 4.341 F
EL
10 7 W
Layout
The MC33441 is high output voltage operation make PC board layout critical to minimize ground bounce and noise. Locate input bypass capacitor, filter capacitor and oscillator's resistor as close to the device pins as possible.
L1 1mH U1 C1 0.1F BATTERY PB1 ENABLE R1 130K 1 2 3 4 VDD ENB RT1 VSS MC33441 EL1 EL2 FILTER COIL (TSSOP-8) 8 7 6 5 C2 27nF/100V EL-LAMP
Figure 10. MC33441 Demo Board Schematic
COMPONENT SUPPLIER
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Tech-Wave Industrial Co., Ltd. Coils Electronics Co., Ltd. Part# CC-0012 EL-Lamp: 14.5mm x 47mm Color: Yellow-Green Inductor: 1mH / 0.15A (886)-2-22692827 (852)-2341-5539 Part# CRCH664- 102K-831015
Supplier
Part Number
Description
Phone
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MC33441
Figure 11. MC33441 PC Board - Top View
Figure 12. MC33441 Component Placement Guide - Component Side
Figure 13. MC33441 PC Board - Bottom View
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MC33441
PACKAGE DIMENSIONS
TSSOP-8 DTB SUFFIX CASE 948J-01 ISSUE O
8x
K REF 0.10 (0.004)
M
0.15 (0.006) T U
S
TU
S
V
S
K
2X
L/2
J J1 L
PIN 1 IDENT. 1 4
B -U-
SECTION N-N N 0.25 (0.010)
0.15 (0.006) T U
S
A -V- N F DETAIL E C
M
0.10 (0.004) -T- SEATING
PLANE
D
G H
SEE DETAIL E
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EE CC EE CC
8
K1
5
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH. PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5. DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7. DIMENSION A AND B ARE TO BE DETERMINED AT DATUM PLANE -W-. DIM A B C D F G H J J1 K K1 L M MILLIMETERS MIN MAX 2.90 3.10 4.30 4.50 --- 1.20 0.05 0.15 0.50 0.75 0.65 BSC 0.50 0.60 0.09 0.20 0.09 0.16 0.19 0.30 0.19 0.25 6.40 BSC 0_ 8_ INCHES MIN MAX 0.114 0.122 0.169 0.177 --- 0.047 0.002 0.006 0.020 0.030 0.026 BSC 0.020 0.024 0.004 0.008 0.004 0.006 0.007 0.012 0.007 0.010 0.252 BSC 0_ 8_
-W-
MC33441
Notes
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MC33441
Notes
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MC33441
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PUBLICATION ORDERING INFORMATION
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MC33441/D

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