M62295GP [RENESAS]
LCD Back-light Control IC; LCD背照式控制IC
| 型号： | M62295GP |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | LCD Back-light Control IC |
| 文件： | 总11页 (文件大小：169K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M62295GP
LCD Back-light Control IC
REJ03D0856-0201
Rev.2.01
Nov 14, 2007
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 16-pin SSOP package. This allows for
simplified peripheral circuit as well as compact and thin set design.
Features
•
•
•
•
Direct drive to n-ch/p-ch MOSFET
Fixed output duty: 45%
Output current (peak): ±300 mA
Light control
Pulse synchronous control
Output OFF period is adjusted synchronous with the OSC frequency. (1 kHz-200 kHz)
Light control available from 10% (Min.) up to 100% by the voltage applied from outside. (Adj2 terminal)
Protection functions
•
2 kinds of timer-latch time setting available by 3 triggers
(few seconds, several tens of seconds set by external capacitor)
Application
LCD Back-light control for Note P.C etc.
Block Diagram
VCC
15
P/C
14
RT CT1
11 12
CT2
13
VCC
5
Ref. volt
UVLO
ON/OFF
OSC.
Vref
+
−
1
G2
+
−
+
−
−
+
9
IN−
−
+
VCC
2.5 V
1.25 V
−
+
16
G1
0.25 V
Protection circuit
(Timer latch)
2
10
6
7
8
3
4
GND
FB
Cscp1 Cscp2 Iscp
N.C Adj2
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 1 of 10
M62295GP
Pin Arrangement
M62295GP
G2
GND
N.C
1
2
3
4
5
6
7
8
16 G1
VCC
15
14 P/C
13 CT2
12 CT1
11 RT
10 FB
Adj2
Vref
Cscp1
Cscp2
Iscp
9
IN−
N.C: No connection
Outline: PLSP0016JA-A (16P2E-A)
(Top view)
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 2 of 10
M62295GP
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Symbol
VCC
IOUT
Ratings
28
±50
±300
400
Unit
V
mA
mA
mW
°C
Conditions
Supply voltage
Output current
Continuous
Peak
Ta = 25°C
Power dissipation
Operating temperature
Storage temperature
Pd
Topr
Tstg
−20 to +85
−40 to +125
°C
Electrical Characteristics
(Ta = 25°C, VCC = 15 V, unless otherwise noted)
Limits
Block
Item
Symbol
VCC
ICC
Unit
V
mA
µA
V
Test Conditions
Min. Typ. Max.
All
Operating supply voltage range
Circuit current
Circuit current in power control state ICC (PC)
ON threshold voltage
OFF threshold voltage
Hysteresis
Input bias current
Open loop gain
Gain bandwidth product
Max. output voltage
Min. output voltage
Max. sink current
Max. source current
3.6
4.5
15
26
7.5
55
6
30
UVLO
VTH ON
VTH OFF
Vhys
IB
AV
GB
VFB+
VFB−
IFB+
IFB−
Vref
LINE
Iref (Max)
fOSC
fOSC (Max)
VRT
VAdj2 (Min)
Min Duty
VAdj2 (Max)
IAdj2
fOSC (CT2)
FB VTH (H)
FB VTH (L)
Iscp VTH (L)
ICSCP1
ICSCP2
CSCP1VTH
CSCP2VTH
Itimer-L
IP/C
3.27
3.43
3.36
70
3.59
V
35
140
mV
nA
dB
MHz
V
mV
mA
µA
V
mV
mA
kHz
kHz
V
V
%
V
nA
kHz
V
V
V
OP. Amp.
−500
−30
80
0.6
2.8
100
2
2.65
200
1
−50
2.40
−80
2.50
5
Ref. voltage Reference voltage
Line regulation
2.60
Max. load current
1
5
OSC.
Oscillating frequency
Max. oscillating frequency
RT terminal voltage
100
200
1.4
2.5
1.1
2.3
5
1.25
2.4
10
Light control Adj2 voltage at min. duty
Min. duty for light control
Adj2 voltage at 100% duty
Adj2 terminal current
15
VAdj2 = Vref
0.1
−100
0.2
−10
1
0.3
+100
Light control frequency
fOSC = 100 kHz
Protection
FB terminal H threshold volt.
FB terminal L threshold volt.
IscpL detection voltage.
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
2.35
0.2
1.1
−0.8
−0.8
2.35
1.1
1.2
1
2.5
0.25
1.25
−1.3
−1.3
2.5
1.25
2.2
2
2.65
0.3
1.4
−1.8
−1.8
2.65
1.4
3.2
4
µA
µA
V
V
mA
µA
V
P/C
VTH (ON)
Duty
0.4
42
0.7
45
1.0
48
Output
%
RT = 12.4 kΩ,
CT1 = 470 pF
Output low voltage
Output high voltage
VOL
VOH
0.05
13.5
0.4
V
V
13.0
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 3 of 10
M62295GP
Function Description
•
Output oscillation circuit and tooth-wave generating circuit for light control (RT, CT1, CT2)
RT (1.25 V) CT1 CT2
R1
Ro
CT1
CT2
FB
R2
Figure 1 Connections of RT, CT1, CT2
As shown in Figure 1, charge/discharge current for each oscillation circuit is set by connecting resistors to RT
terminal.
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. 0.25 V) and upper limit (approx. 1.25 V) by the charge current set at RT terminal.
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. 0.25 V) and upper
limit. (approx. 1.25 V)
Each charge current and oscillation frequency is decided by the formula shown below.
1.25
CT1 charge / Discharge current (ICT1 charge) =
Ro
1.25
Ro
1
CT2 charge / Discharge current (ICT2 charge) =
•
20
1
1
T
=
Output freq. (fOSC) =
2
CT1 •
CT2 •
ICT1 charge
1
Tooth-wave freq. (CT2OSC) =
1
ICT2 charge
Tooth-wave freq. (CT2OSC
Output freq. (fOSC
)
CT1
(divided ratio) =
)
CT2 • 10
1.25 V
0.8 V
0.7 V
CT1
0.25 V
T
G1
(POUT)
G2
(NOUT)
1.25 V
CT2
0.25 V
Figure 2 Waveform for CT1, CT2, and G1, G2
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 4 of 10
M62295GP
• ON/OFF control function (P/C)
VCC
P/C
Figure 3 Connection Example for P/C
ON/OFF control is available using P/C terminal. As shown in Figure 3, ON/OFF control is made by connecting P/C
terminal to VCC or GND or by making P/C terminal open.
P/C = VCC: IC in normal operation mode
P/C = GND & OPEN: IC operation at halt
•
Light control function (Adj2)
Figure 4 shows the connections of Adj2 terminal.
When the light control voltage is 2.4 V 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.
Figure 5 shows how the applied voltage to Adj2 terminal relates itself to light control.
The voltage range of Adj2 terminal available for light control is 0.1 V to 2.4 V.
When the voltage is 2.4 V or more, light control duty becomes minimum (10%), and when it is 0.1 V or less, light
control duty becomes 100%.
Minimum duty is available by connecting Adj2 terminal to Vref terminal.
Output waveform on above mentioned stage is shown in Figure 6 (a) to Figure 6 (c). Figure 6 (a) shows 100% light
controlled state, Figure 6 (b) middle state (50% light controlled), Figure 6 (c) minimum duty state.
Light control
voltage
R1
Light control
voltage
Adj2
Adj2
R2
(a) In the case of direct
applying to Adj2 terminal
(b) In the case of applying
to Adj2 terminal by the
division of resistors
Figure 4 Connections of Adj2 Terminal
100
80
60
40
20
10
2.4
2.0
0.1
1.0
1.4
Adj2 Terminal Voltage (V)
Figure 5 Adj2 Terminal Voltage-light Control Duty Characteristics
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 5 of 10
M62295GP
Formula for light control level by light control voltage
2.4 − VAdj2
+ ON Duty Min (%)
ON Duty = (100 − ON Duty Min) ×
2.4
VAdj2: Adj2 terminal voltage (V)
ON Duty Min = 10 (%)
G1 output
G2 output
CT2 waveform
Figure 6 (a) 100% Light Control
Figure 6 (b) 50% Light Control
Figure 6 (c) 10% Light Control
G1 output
G2 output
CT2 waveform
G1 output
G2 output
CT2 waveform
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 6 of 10
M62295GP
Protection function (timer-latch) (Cscp1, Cscp2, Iscp)
•
Cscp1
Cscp1
Cscp2
Cscp2
Figure 7 Connections of Cscp1, Cscp2
Application for timer-latch by detecting tube current and feedback 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: Terminal for capacitance for timer-latch set (few second)
2.5
Timer-L (Cscp1) = Cscp1 ×
1.3 × 10−6
Cscp2: Terminal for capacitance for timer-latch set (few millisecond)
1.25
Timer-L (Cscp2) = Cscp2 ×
1.3 × 10−6
BL tube current detection
Iscp
Figure 8 Connections of lscp Terminal
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 7 of 10
M62295GP
Detection of tube current
Detection of tube current is made by Iscp terminal.
Detection voltage for Iscp terminal is set 1.25 V.
After power is on, when Iscp voltage does not rise up to 1.25 V by timer-L (Cscp1) time, or when Iscp voltage
becomes 1.25 V or less after start-up, abnormality is detected to move on to the protection operation mode in
Figure 1.
If Iscp voltage is less than 1.25 V, light control is not made. (100%)
Detection of feedback voltage
Detection of feedback voltage is made by FB terminal.
When FB terminal voltage goes down to FB low detection voltage (0.25 V) 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
Figure 1.
Table 1
Protection Operation Mode at a Glance
Protection
Triggers for Protection Operation
Timer-latch Time
Operation Mode
Operation State
Ampout = "H" Ampout = "L"
IO = 0
2 s
10 ms
Normal start-up
Start-up in
IO = Max Operation stop after
10 ms
O
O
O
shortcircuited state
IO = 0
Operation stop
instantaneously
O
O
O
O
∆
Start-up in open state
Operation stop after
2 s.
O
O
O
Start-up in black
mode
OFF
ON
Operation stop after
2 s.
Normal start-up if
turn-on is made
within 2 s.
Shortcircuit while
in operation
IO = Max Operation stop
O
O
O
O
instantaneously
IO = 0
Operation stop
instantaneously
O
O
O
Open while in operation
Operation stop
instantaneously
Notes: 1. Timer-latch time refers to the time under Cscp = 1 µF, Cscp2 = 0.1 µF.
2. Amp. output is "H" when tube current Io equals to 0, "L" when it is at its minimum. Detection voltage is 2.5 V
("H" side), 0.25 V ("L" side).
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 8 of 10
M62295GP
BL Back-light Control Application Example
Ω
4 . 7 k
Ω
4 7 k
Ω
2 . 2 k
Ω
9 . 1 k
Ω
3 . 3 k
Ω
1 0 k
Ω
1 0 k
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 9 of 10
M62295GP
Package Dimensions
JEITA Package Code
P-LSSOP16-4.4x5-0.65
RENESAS Code
Previous Code
16P2E-A
MASS[Typ.]
0.06g
PLSP0016JA-A
9
16
NOTE)
1. DIMENSIONS "*1" AND "*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION "*3" DOES NOT
INCLUDE TRIM OFFSET.
F
1
8
Index mark
A2
A1
Dimension in Millimeters
Reference
Symbol
Min Nom Max
*2
D
D
E
4.9 5.0 5.1
4.3 4.4 4.5
1.15
A2
A
1.45
A1
bp
c
0
0.1 0.2
0.17 0.22 0.32
*3
bp
e
0.13 0.15
0°
0.2
10°
Detail F
y
HE
e
6.2 6.4 6.6
0.53 0.65 0.77
0.10
y
L
0.3 0.5 0.7
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 10 of 10
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