M62295 [MITSUBISHI]
LCD BACK-LIGHT CONTROL IC; LCD背照式控制IC
| 型号： | M62295 |
| 厂家： | 
Mitsubishi Group |
| 描述： | LCD BACK-LIGHT CONTROL IC |
| 文件： | 总7页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MITSUBISHI(Standard Linear ICs)
M62295GP
LCD BACK-LIGHT CONTROL IC
DESCRIPTION
M62295GP is a semiconductor integrated circuit designed for PC
back- light control, which employs 2 output totempole output circuit
specifically suitable for inverter drive with piezo device.
Such necessary functions as light control, protection circuit are
housed in 16pin SSOP package. This allows for simplified peripheral
circuit as well as compact and thin set design.
PIN CONFIGURATION (TOP VIEW)
G2 1
16
15
14
13
12
11
10
9
G1
GND 2
Vcc
P/C
CT2
CT1
RT
N.C
3
FEATURES
• Direct drive to n-ch/ p-ch MOSFET
Adj2 4
Vref 5
• Fixed output duty: 45%
• Output current (peak) : ± 300mA
Cscp1 6
Cscp2 7
Iscp 8
• Light control
• Pulse synchronous control
FB
Output OFF period is adjusted synchronous with the OSC
frequency (1kHz-200kHz).
IN -
• Light control available from 10%(MIN.) up to 100% by the
voltage applied from outside (Adj2 terminal).
• Protection functions
Outline 16P2E-A
N.C : NO CONNECTION
• 2 kinds of timer-latch time setting available by 3 triggers
(few seconds, several tens of seconds set by external capacitor)
APPLICATION
• CLD Back-light contorol for Note P.C etc.
BLOCK DIAGRAM
P/C
14
RT
11
CT1
12
CT2
13
Vcc
15
VCC
Ref. volt.
ON/OFF
5
9
UVLO
OSC.
Vref
1
G2
VCC
2.5V
IN -
1.25V
Protection
Circuit
16
0.25V
(Timer Latch)
G1
2
10
6
7
8
3
4
GND FB
Cscp1 Cscp2 Iscp
N.C
Adj2
( 1 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted)
Symbol
Vcc
Parameter
Conditions
Ratings
Unit
Supply voltage
28
± 50
V
Continuous
Peak
mA
mA
mW
°C
IOUT
Output current
± 300
Ta=25°C
400
Pd
Power dissipation
Operating temperature
Storage temperature
Topr
Tstg
-20 ~ +85
-40 ~ +125
°C
ELECTRICAL CHARACTERISTICS (Ta=25°C, Vcc=15V, unless otherwise noted)
Limits
Symbol
Parameter
Test conditions
Unit
Min.
3.6
Typ.
Max.
26
Operating supply voltage range
Circuit current
Circuit current
in power control state
ON threshold voltage
OFF threshold voltage
Hysterisis
Vcc
V
mA
µA
Icc
6
30
7.5
4.5
Icc(PC)
VTH ON
VTH OFF
Vhys
15
55
3.27
V
V
3.43
3.36
70
3.59
35
mV
nA
140
IB
Input bias current
Open loop gain
-500
-30
80
AV
dB
MHz
V
GB
Gain bandwidth product
Max. output voltage
Min. output voltage
Max. sink current
Max. source current
0.6
2.8
100
2
VFB+
2.65
VFB-
mV
mA
200
IFB+
1
IFB-
-50
2.40
-80
2.50
5
µA
V
VREF
2.60
Reference voltage
Line regulation
LINE
mV
mA
KHz
KHz
V
Iref(Max)
fosc
1
5
Max. load current
100
Oscillating frequency
Max. oscillating frequency
RT termina voltage
fosc(Max)
VRT
200
1.4
1.1
2.3
5
1.25
2.4
10
VAdj2(Min)
Min Duty
VAdj2(Max)
IAdj2
Adj2 voltage at min. duty
Min. duty for light control
Adj2 voltage at 100% duty
Adj2 terminal current
V
2.5
VAdj2=Vref
15
%
0.1
-100
V
0.2
-10
1
0.3
nA
KHz
V
+100
fosc(CT2)
fosc = 100KHz
Light control frequency
FB terminal H threshold volt.
FB terminal L threshold volt.
IscpL detection voltage.
2.35
0.2
FB VTH(H)
FB VTH(L)
Iscp VTH(L)
2.5
0.25
1.25
2.65
0.3
V
1.1
V
1.4
( 2 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
ELECTRICAL CHARACTERISTICS (Ta=25°C, Vcc=15V, unless otherwise noted)
Limits
Typ.
-1.3
-1.3
2.5
Parameter
Test conditions
Unit
Symbol
Min.
-0.8
-0.8
2.35
1.1
1.2
1
Max.
-1.8
-1.8
2.65
1.4
3.2
4
ICSCP1
ICSCP2
CSCP1VTH
CSCP2VTH
Itimer-L
IP/C
CSCP1 charge current
CSCP2 charge current
CSCP1 detection voltage
CSCP2 detection voltage
Circuit current at timer-latch
P/C terminal flow-in current
P/C threshold voltage
Output duty
µA
µA
V
V
1.25
2.2
mA
µA
V
2
P/C
VTH(ON)
Duty
0.4
42
0.7
1.0
48
%
V
RT=12.4KW, CT1= 470pF
45
VOL
Output Low voltage
0.05
13.5
0.4
VOH
Output High voltage
V
13.0
( 3 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
Function description
• Output oscillation circuit and tooth-wave generating circuit for light control (RT, CT1, CT2)
As shown in Fig.1, charge/discharge current
for each oscillation circuit is set by connecting
resistors to RT terminal.
RT (1.25V)
CT1
CT2
RT terminal is connected to FB terminal by
resistor to control the frequency for light control.
CT1 is the terminal for connecting capacitor for
output oscillation circuit, generating triangular-
wave oscillating between lower limit (approx. 0.25V)
and upper limit (approx. 1.25V) by the charge
current set at RT terminal.
CT1
CT2
Ro
FB
CT2 is the terminal for connecting capacitor for
tooth-wave for light control, into which one twentieth
of charge current of CT1 terminal flows generating
tooth-wave oscillating between lower limit (approx.
0.25V) and upper limit (approx. 1.25V).
Fig.1 Connections of RT,CT1, CT2
Each charge current and oscillation frequency is
decided by the formula shown below.
1.25V
1.25
Ro
0.8V
0.7V
CT1 charge/ discharge current
=
CT1
(ICT1charge)
T
0.25V
1.25
Ro
1
20
CT2 charge/ discharge current
(ICT2charge)
G1
(POUT)
=
*
1
1
Output freq. (Fosc) =
=
G2
(NOUT)
2
T
CT1 *
ICT1charge
1.25V
0.25V
1
1
ICT2charge
CT2
Tooth - wave freq. (CT2osc) =
Tooth - wave freq. (CT2osc)
CT2 *
CT1
CT2 * 10
Fig.2 Waveform for CT1, CT2, and G1, G2
(divided ratio) =
Output freq. (Fosc)
• ON/OFF control function (P/C)
ON/OFF control is available using P/C terminal.
As shown in Fig.3, ON/OFF control is made by
connecting P/C terminal to Vcc or GND or by making
P/C terminal open.
Vcc
P/C
P/C = Vcc : IC in normal operation mode
P/C = GND&OPEN : IC operation at halt
Fig.3 Connection example for P/C
( 4 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
• Light control function (Adj2)
Fig.4 shows the connections of Adj2 terminal.
When the light control voltage is 2.4V or more,
divided voltage by the resistors is applied. Light
control is decided by the OSC. frequency of CT2
and the applied voltage to Adj2 terminal.
Fig.5 shows how the applied voltage to Adj2
terminal relates itself to light control.
Light control
voltage
R1
Light control
voltage
Adj2
Adj2
R2
The voltage range of Adj2 terminal available for
light control is 0.1V to 2.4V.
When the voltage is 2.4V or more, light control
duty becomes minimum(10%), and when it is
0.1V or less, light control duty becomes 100%.
Minimum duty is available by connecting Adj2
terminal to Vref terminal.
(b). In the case of applying
to Adj2 terminal by the
division of resistors
(a). In the case of direct
applying to Adj2 terminal
Fig.4 Connections of Adj2 terminal
Output waveform on above mentioned stage is
shown in Fig.6(a) to Fig.6(c). Fig6(a) shows
100% light controlled state, Fig.6(b) middle state
(50% light controlled), Fig6(c) minimum duty
state.
100
80
60
40
Formula for light control level by light control voltage
20
10
2.4 - VAdj2
ONDuty = (100 - ONDutyMin) *
+ONDutyMin (%)
2.4
0.1
1.0 1.4
2.0 2.4
Adj2 terminal voltage (V)
VAdj2 : Adj2 terminal voltage (V)
ONDutyMin = 10 (%)
Fig.5 Adj2 terminal voltage-
light control duty characteristics
G1 output
G2 output
CT2 wave form
Fig.6(a) 100% light control
G1 output
G2 output
CT2 wave form
Fig.6(a) 50% light control
G1 output
G2 output
CT2 wave form
Fig.6(a) 10% light control
( 5 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
• Protection function (timer-latch) (Cscp1, Cscp2, Iscp)
Application for timer-latch by detecting tube current
and feecback voltage is available by using Iscp,
Cscp1, Cscp2 terminal.
Two kinds of setting for timer-latch time is available
by the setting of Cscp1, Cscp2. Each timer-latch
time is set by the formula below.
Cscp1
Cscp1
Cscp2
Cscp2
Cscp1 :
Terminal for capacitance for timer-latch set (few sec.)
2.5
1.3 * 10
Timer-L (Cscp1) = Cscp1 *
-6
Cscp2 :
Terminal for capacitance for timer-latch set (few msec.)
Fig.7 Connections of Cscp1, Cscp2
1.25
1.3 * 10
Timer-L (Cscp2) = Cscp2 *
-6
Detection of tube current
Detection of tube current is made by Iscp terminal.
Detection voltage for Iscp terminal is set 1.25V.
After power is on, when Iscp voltage does not rise
up to 1.25V by timer-L(Cscp1) time, or when Iscp
voltage becomes 1.25V or less after start-up,
abnormality is detected to move on to the protection
operation mode in Fig.1.
BL tube current detection
Iscp
If Iscp voltage is less than 1.25V, light control is
not made(100%).
Detection of feedback voltage
Detection of feedback voltage is made by FB
terminal.
Fig.8 Connections of Iscp terminal
When FB terminal voltage goes down to FB low
detection voltage (0.25V) or less, or when it rise up
to FB terminal high detection voltage or more,
abnormality is detected to move on to the protection
operation mode in Fig.1.
Triggers for protection operation
Protection
operation mode
Timer-latch time
Operation state
Normal start-up
2sec
10msec
Ampout="H" Ampout="L"
Io=0
Io=Max
Operation stop after 10ms
Operation stop instantaneously
Operation stop after 2sec.
Operation stop after 2sec.
Start-up in
shortcircuited state
Io=0
Start-up in open state
OFF
Start-up in black
mode
Normal start-up if turn-on
is made within 2sec.
ON
Io=Max
Io=0
Operation stop instantaneously
Operation stop instantaneously
Operation stop instantaneously
Shortcircuit while
in operation
Open while in operation
Table 1. Protection operation mode at a glance
Note 1. Timer-latch time refers to the time under Cscp=1uF, Cscp2=0.1uF.
2. Amp. output is "H" when tube current I equals to 0, "L" when it is at
0
its minimum. Detection voltage is 2.5V("H" side), 0.25V("L" side).
( 6 / 7 )
MITSUBISHI(Standard Linear ICs)
M62295GP
PC BACK- LIGHT CONTROL IC
( 7 / 7 )
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