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
P/C
RT
CT1
CT2
15
14
11
12
13
VCC
Vref
5
Ref. volt
UVLO
ON/OFF
OSC.
+
−
−
+
2.5 V
Light control circuit
−
+
9
+
−
+
−
Latch
IN−
1 G2
1.25 V
VCC
−
+
0.25 V
2
10
GND
FB
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 1 of 10
16 G1
Protection circuit
(Timer latch)
6
7
Cscp1 Cscp2
8
3
4
Iscp
N.C
Adj2
M62295GP
Pin Arrangement
M62295GP
G2
1
16 G1
GND
2
15 VCC
N.C
3
14 P/C
Adj2
4
13 CT2
Vref
5
12 CT1
Cscp1
6
11 RT
Cscp2
7
10 FB
Iscp
8
9 IN−
(Top view)
N.C: No connection
Outline: PLSP0016JA-A (16P2E-A)
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 2 of 10
M62295GP
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item
Symbol
Ratings
28
Unit
V
Conditions
Supply voltage
VCC
Output current
IOUT
±50
±300
mA
mA
Continuous
Peak
Power dissipation
Operating temperature
Pd
Topr
400
−20 to +85
mW
°C
Ta = 25°C
Storage temperature
Tstg
−40 to +125
°C
Electrical Characteristics
(Ta = 25°C, VCC = 15 V, unless otherwise noted)
Limits
Block
All
Item
Symbol
Min.
3.6
Typ.
Max.
26
Unit
Operating supply voltage range
VCC
Circuit current
Circuit current in power control state
ICC
ICC (PC)
4.5
15
6
30
7.5
55
mA
µA
ON threshold voltage
OFF threshold voltage
VTH ON
VTH OFF
3.27
3.43
3.36
3.59
V
V
Hysteresis
Input bias current
Vhys
IB
35
−500
70
−30
140
mV
nA
Open loop gain
Gain bandwidth product
AV
GB
80
0.6
dB
MHz
Max. output voltage
Min. output voltage
VFB+
VFB−
2.65
2.8
100
200
V
mV
Max. sink current
Max. source current
IFB+
IFB−
1
−50
2
−80
mA
µA
Reference voltage
Line regulation
Vref
LINE
2.40
2.50
5
2.60
V
mV
Max. load current
Oscillating frequency
Iref (Max)
fOSC
1
5
100
mA
kHz
Max. oscillating frequency
RT terminal voltage
fOSC (Max)
VRT
1.1
1.25
200
1.4
kHz
V
Adj2 voltage at min. duty
Min. duty for light control
VAdj2 (Min)
Min Duty
2.3
5
2.4
10
2.5
15
V
%
Adj2 voltage at 100% duty
Adj2 terminal current
VAdj2 (Max)
IAdj2
0.1
−100
0.2
−10
0.3
+100
V
nA
Light control frequency
FB terminal H threshold volt.
fOSC (CT2)
FB VTH (H)
2.35
1
2.5
2.65
kHz
V
FB terminal L threshold volt.
IscpL detection voltage.
FB VTH (L)
Iscp VTH (L)
0.2
1.1
0.25
1.25
0.3
1.4
V
V
Cscp1 charge current
ICSCP1
−0.8
−1.3
−1.8
µA
Cscp2 charge current
ICSCP2
−0.8
−1.3
−1.8
µA
Cscp1 detection voltage
CSCP1VTH
2.35
2.5
2.65
V
Cscp2 detection voltage
Circuit current at timer-latch
CSCP2VTH
Itimer-L
1.1
1.2
1.25
2.2
1.4
3.2
V
mA
P/C
P/C terminal flow-in current
P/C threshold voltage
IP/C
VTH (ON)
1
0.4
2
0.7
4
1.0
µA
V
Output
Output duty
Duty
42
45
48
%
Output low voltage
Output high voltage
VOL
VOH
13.0
0.05
13.5
0.4
V
V
UVLO
OP. Amp.
Ref. voltage
OSC.
Light control
Protection
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 3 of 10
Test Conditions
V
VAdj2 = Vref
fOSC = 100 kHz
RT = 12.4 kΩ,
CT1 = 470 pF
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
FB
CT1
CT2
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.
CT1 charge / Discharge current (ICT1 charge) =
1.25
Ro
CT2 charge / Discharge current (ICT2 charge) =
1.25
Ro
Output freq. (fOSC) =
1
T
1
20
1
=
CT1 •
2
ICT1 charge
1
Tooth-wave freq. (CT2OSC) =
CT2 •
Tooth-wave freq. (CT2OSC)
Output freq. (fOSC)
•
1
ICT2 charge
(divided ratio) =
CT1
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
R2
Adj2
(b) In the case of applying
to Adj2 terminal by the
division of resistors
(a) In the case of direct
applying to Adj2 terminal
Light Control Duty (%)
Figure 4 Connections of Adj2 Terminal
100
80
60
40
20
10
0.1
1.0 1.4
2.0 2.4
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
ON Duty = (100 − ON Duty Min) ×
2.4 − VAdj2 + 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
G1 output
G2 output
CT2 waveform
Figure 6 (b) 50% Light Control
G1 output
G2 output
CT2 waveform
Figure 6 (c) 10% Light Control
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 6 of 10
M62295GP
1.3µA
1.3µA
• Protection function (timer-latch) (Cscp1, Cscp2, Iscp)
Cscp1
Cscp2
Cscp1
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)
Timer-L (Cscp1) = Cscp1 ×
2.5
1.3 × 10−6
Cscp2: Terminal for capacitance for timer-latch set (few millisecond)
Timer-L (Cscp2) = Cscp2 ×
1.25
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
Operation State
Normal start-up
Start-up in
shortcircuited state
IO = Max
IO = 0
Start-up in open state
Start-up in black
mode
OFF
ON
Shortcircuit while
in operation
Protection
Operation Mode
IO = Max
IO = 0
Open while in operation
Operation stop after
10 ms
Operation stop
instantaneously
Triggers for Protection Operation
Ampout = "H"
Ampout = "L"
IO = 0
Timer-latch Time
2s
O
O
O
O
O
Operation stop after
2 s.
Operation stop after
2 s.
O
O
O
O
Normal start-up if
turn-on is made
within 2 s.
Operation stop
instantaneously
∆
O
Operation stop
instantaneously
Operation stop
instantaneously
O
O
10 ms
O
O
O
O
O
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
47 µF
CT1
9.1 kΩ
RT
33 kΩ
0.1 µF
Vref
FB
1.5 µF
2.2 kΩ
2.2 kΩ
0.1 µF
Cscp1
Iscp
G2
G1
IN−
120 kΩ
0.1 µF
0.022 µF
Cscp2
M62295GP
Adj2
0.1 µF
GND
P/C
VCC
CT2
4700 pF
470 pF
10 kΩ
VIN
10 kΩ
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 9 of 10
3.3 kΩ
47 kΩ
0.022 µF
0.022 µF
470 kΩ
120 kΩ
Piezo
transformer
2.2 MΩ
4.7 kΩ
47 kΩ
220 Ω
BL tube
M62295GP
BL Back-light Control Application Example
M62295GP
Package Dimensions
JEITA Package Code
P-LSSOP16-4.4x5-0.65
RENESAS Code
PLSP0016JA-A
MASS[Typ.]
0.06g
9
E
16
NOTE)
1. DIMENSIONS "*1" AND "*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION "*3" DOES NOT
INCLUDE TRIM OFFSET.
*1
HE
Previous Code
16P2E-A
F
1
8
Index mark
c
A2
A1
Reference
Symbol
*2
A
L
D
*3
e
bp
y
Detail F
D
E
A2
A
A1
bp
c
HE
e
y
L
REJ03D0856-0201 Rev.2.01 Nov 14, 2007
Page 10 of 10
Dimension in Millimeters
Min
4.9
4.3
Nom Max
5.0 5.1
4.4 4.5
1.15
1.45
0
0.1 0.2
0.17 0.22 0.32
0.13 0.15 0.2
0°
10°
6.2 6.4 6.6
0.53 0.65 0.77
0.10
0.3 0.5 0.7
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