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Standard ICs
EL driver for portable sets
BA3899F
The BA3899F is an IC developed for EL drive applications. It uses a more compact interface than transformer systems, and is ideal for use in thin sets.
*Applications notebooks and other portable devices Pagers, electronic *Features 1) Drive oscillation frequency can be set using external capacitance.
2) Equipped with standby control pin.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Maximum applied voltage Symbol VCC Pd Topr Tstg VST Limits 8.0 450 - 10 ~ + 60 - 55 ~ + 125 8.0 Unit V mW C C V
Reduced by 4.5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC Min. 1.0 Typ. 5.0 Max. 7.0 Unit V
*Block diagram
SW1 8 SW2 7 VCC 6 STBY 5
STBY RSW2
OSC1
OSC2
1 GND
2 N.C.
3 C1
4 C2
1
Standard ICs
BA3899F
*Pin descriptions
Pin No. 1 2 Pin name GND N.C. I/O I -- Pin voltage -- --
VCC
Internal equivalent circuit -- -- GND pin
Function
--
1k
3
C1
I/O
--
C1
OSC1 oscillator circuit; external capacitor pin
GND
VCC
200
4
C2
I/O
--
C2
OSC2 oscillator circuit; external capacitor pin
GND
1k STBY
50k
Standby control pin (HIGH state: standby cancelled) When applying resistance, etc. to the STBY pin, be careful not to exceed the threshold values.
5
STBY
I
0
200k GND
6
VCC
I
--
--
VCC input pin
VCC 50k
7
SW2
O
--
SW2 switching output pin
X1 X20 500 GND SW2
VCC
8
SW1
O
--
X1
X5
SW1
SW1 switching output pin
GND
2
Standard ICs
BA3899F
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5.0V, C1 = 0.033F, C2 = 1500pF)
Parameter Supply current C1 pin oscillation frequency C2 pin oscillation frequency SW1 Source current Sink current Source current Pull-down resistance Symbol ICC fSW1 fSW2 ISW1SO ISW1SI ISW2SO RSW2 VSTON VSTOFF IQ (ST) Min. 3.0 75 17 100 - 40 3.2 400 1.0 -- -- Typ. 4.6 95 23 140 -- 4.4 500 -- -- 0 Max. 6.2 120 29 180 -- 6.1 600 -- 0.3 2.0 Unit mA Hz kHz A A mA V V A Conditions When used as stand-alone unit -- -- VC1 = 1.0V, VC2 = 0.05V, VSW1 = 0V VC1 = 0.05V, VC2 = 0.05V, VSW1 = 1.0V VC1 = 0.05V, VC2 = 0.05V, VSW2 = 0V Vst = 0.35V, VSW2 = 0.3V -- -- --
SW2
Standby pin control Operating voltage condition Non-operating Quiescent current in standby state
*Measurement circuit
fSW1 Counter VSW1
A
fSW2 Counter VSW2 VCC
A A
VSTBY
ISW1
ISW2
IQ
8
7
6
5
STBY RSW2
OSC1
OSC2
1
2
3
4
VC1
0.033F 1% VC2
1500pF 1%
Fig.1
3
Standard ICs
BA3899F
*Application example
D1 ROHM: 1SS376 L1 1.5mH (TOKO: D73LC) Q2 Q1 SANYO: 2SC3645T ROHM: 2SC4061KP
8
+
EL 16000pF
R1
2k
2.2F 100k VCC = 5V
SW1
7
SW2
6
VCC
5
STBY
STBY
RSW2
RX 300k OSC1 OSC2
1
GND
2
N.C.
3
C1
4
C2
C1 8200pF 10%
C2 1500pF 10%
Fig. 2
Because of the characteristics of the EL element, continuous application of particularly high DC power supply voltage can shorten the lifetime of the
element. To avoid this, we recommend inserting a switch in the power supply line.
4
Standard ICs
D1 ROHM: 1SS376 L1 1mH (TOKO: 43FS) or (TDK: NL453232) Q2 Q1 SANYO: 2SC3143K5 ROHM: 2SC4061KP 8 SW1 7 SW2 6 VCC 5 STBY
+
BA3899F
EL 5000pF
R1
4.7k
2.2F
VCC = 1.5V
VSTBY = 1.5V Hi: act STBY RSW2
OSC1
OSC2
1
GND
2
N.C.
3
C1
4
C2
C1 0.033F 10%
C2 1500pF 10%
Fig. 3
5
Standard ICs
notes *Operation output (1) EL drive As shown in Figure 4, the EL drive output consists of charging (rise in voltage caused by switching) and discharging waveforms. The switching frequency is determined by fSW2 and the charging and discharging timing by fSW1.
BA3899F
(4) Q1, Q2, and D1 The VO (Max.) shown in Figure 4 is applied to the output VO, so if using any transistor other than that recommended, caution is required concerning the pressure withstand value. Also, Q2 must have characteristics which allow it to keep pace with the switching speed of fSW2.
tSW1 (fSW1)
VO (Max.)
t1 Charge
t2 Discharge
Fig.4
(2) Setting fSW1 The oscillation frequency is determined by charging and discharging of the external capacitance of the C1 pin. The value for C1 should be set based on the following equation.
(5) RX (resistor for adjusting light volume) With a configuration like that shown in Figure 5, the volume of light can be adjusted. However, RX should be set so that IX satisfies the following condition.
C1 =
1
VC1 x ( 1 + 1 ) I2 I1 1 = (3.14E - 6) x fSW1
x
1 fSW1
Ix ( =
Vx - 0.2V ) < 40A Rx
(VCC = 5V)
If IX > 40A, LSI dispersion, temperature fluctuation, and other elements can cause oscillation of the C2 pin to stop. Be sure the above condition is satisfied.
C2 4 Rx Vx Ix 1500pF
The recommended setting range for fSW1 is 40Hz to 800Hz. However, the VO (Max.) shown in Figure 4 is determined by fSW1, so caution is required concerning the pressure withstand values of Q1, Q2, and D1. (3) fSW2 fSW2 is the switching pressure rise frequency, and is determined by the external capacitance of the C2 pin. This value (1500pF) is determined by the inductance value and the Q2 transistor capability. When changing this value, the drive capability of Q2 must be taken into consideration in order to avoid the possibility of malfunction.
Fig.5
6
Standard ICs
BA3899F
*Electrical characteristic curves
10 QUIESCENT CURRENT: ICC (mA) 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10
0 1 2 3 4 5 6 7 8
OSCILLATION FREQUENCY: fSW (Hz)
C1 = 0.033F C2 = 1500pF VST = 5V Rx = 75C
fSW1
75C
10k
- 25C 25C C1 = 0.033F C2 = 1500pF Rx =
1k
- 25C 25C
fSW2
100
75C - 25C 25C
INPUT VOLTAGE: VCC (V)
INPUT VOLTAGE: VCC (V)
Fig. 6 Supply current (when used as stand-alone unit) vs. power supply voltage
Fig. 7 Oscillation frequency of C1 and C2 pins vs. power supply voltage
250 SW1 SOURCE CURRENT: ISWISO (A) SW1 SINK CURRENT: ISW1SI (%) 75C 200 25C - 25C 100
3.0 VC1 = 0V VSW1 = 1.0V VST = 5V 2.0
150
75C
25C 1.0 - 25C 10 0 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE: VCC (V)
50 VC1 = 1.0V VSW1 = 0V 0 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE: VCC (V)
Fig. 8 SW1 sink current vs. power supply voltage
Fig. 9 SW1 source current vs. power supply voltage
SW2 PULL-DOWN RESISTANCE: RSW2 ()
10 SW2 SOURCE CURRENT: ISW2SO (mA) 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 25C
1000 900 800 700 600 500 400 300 200 100 0
VC1 = 1.0V VSW1 = 0V VST = 5V 75C
VCC = 5V VSW2 = 0.2V VST = 0V
75C
- 25C
25C
- 25C
8
9
10
0
1
2
3
4
5
6
7
8
9
10
INPUT VOLTAGE: VCC (V)
INPUT VOLTAGE: VCC (V)
Fig. 10 SW2 source current vs. power supply voltage
Fig. 11 SW2 pull-down resistance vs. power supply voltage
7
Standard ICs
BA3899F
*External dimensions (Units: mm)
5.0 0.2 8 6.2 0.3 4.4 0.2 5
1.5 0.1
1
4
0.11
1.27
0.4 0.1
0.3Min. 0.15
SOP8
8
0.15 0.1

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