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Электронный компонент: BA9756

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BA9756FS
Multimedia ICs
High-voltage control circuit for CRT
displays
BA9756FS
The BA9756FS is LSIs that control CRT anode voltage in multi-scan monitors and similar devices, using
a chopper-type voltage control circuit. The internal sawtooth wave generator circuit uses automatic gain control
(AGC) to enable coverage of a wide range from 30kHz to over 150kHz. The BA9756FS is equipped with an internal
high-precision voltage source featuring an output voltage precision of 0.7%.
!Applications
CRT displays, HDTVs, others
!Features
1) Internal chopper-type voltage
control circuit.
2) Internal buffer circuit enables direct
drive of Power MOSFET for output
drive.
3) Internal high-precision voltage
source offers output voltage
precision of 0.7%.
!Block diagram
M / M
GND
9.0V
REF
V
CC
1
V
CC
2
Buffer
+
+
+
SAW GEN.
20
1
19
2
18
3
17
4
16
5
15
6
14
7
13
8
12
9
11
10
!Absolute maximum ratings
(Ta=25C)
Parameter
Symbol
Limits
Unit
V
CC
1
V
CC
2
Pd
Topr
Tstg
- 25~+80
Power supply voltage 1
Power supply voltage 2
Power dissipation
Operating temperature
Storage temperature
*
1
*
1 When mounted on a 70mm
70mm
1.6mm glass epoxy board.
Reduced by 7.5mW for each increase in Ta of 1C over 25C.
18
20
750
- 55~+125
V
V
C
C
mW
!Recommended operating conditions
(Ta=25C)
Parameter
Symbol
Unit
Max.
Typ.
Min.
V
CC
1
V
CC
2
11
11
-
-
V
V
17
17
Power supply voltage 1
Power supply voltage 2
BA9756FS
Multimedia ICs
!Pin descriptions
11
12
13
15
19
14
16
17
20
*
1 N.C. pin processing
In order to boost the thermal effect of the IC, we recommend connecting this to the GND or to an adjacent pin.
*
2
GND
(Power GND)
This may be shared with the signal GND, but make sure sufficiently stable grounding
is provided.
See
*
1
.
A decoupling capacitor should be positioned in the vicinity of this pin.
N.C.
DTC IN
(dead time
control input)
ERRREF
(error amplifier input)
PWMOUT
(PWM output)
V
CC
2
(Power V
CC
)
ERROUT
(error amplifier output)
N.C.
V
CC
1
(signal V
CC
)
This is the input pin for the reference voltage.
This is the output pin for the error amplifier.
See
*
1
.
18
N.C.
See
*
1
.
A decoupling capacitor should be positioned in the vicinity of this pin.
If a voltage of less than GND or higher than V
CC
is applied because of external back
electromotive force, a protective diode should be inserted (
*
2
).
If the protector circuit and thermal shutdown circuit are tripped, output is fixed at high (V
CC
)
level.
The voltage input to this pin enables restriction of the PWM output duty.
The duty control is between 0V and 9V, and approximately 0% to 100% is enabled. At 0V,
however, restrictions apply.
The minimum pulse width for the PWM is 0.85
s (Typ. at 90kHz).
11
12
14
V
CC
2
TO FET gate
+
Pin No.
Pin name
Function
1
2
3
5
9
4
6
7
8
10
ERRIN
(error amplifier + input)
This is the recovery voltage input pin.
Capacitance should be determined taking into consideration the linearity at the minimum
oscillation frequency, and the response time when the frequency changes.
See
*
1
.
This is the output pin for optimized sawtooth waves, based on the maximum oscillation
frequency.
fMax120kHz C = 1000pF fMax100kHz C = 1200pF
fMax 80kHz C = 1500pF fMax 60kHz C = 2000pF
N.C.
N.C.
N.C.
AGC
(constant for AGC)
SAWOUT
(constant for
sawtooth wave)
MMCR
(delay constant for
monostable multivibrator)
HDIN
(Hd pulse input)
VREF9
(Ref 9V output)
GND
(Signal GND)
See
*
1
.
See
*
1
.
A charging resistance of 4.7k
or higher should be used.
The threshold level is 4.5V.
The threshold level is approximately 2.1V.
An output deviation of 0.7% is assured through trimming.
This may be shared with the power GND, but make sure sufficiently stable grounding
is provided.
BA9756FS
Multimedia ICs
!Input / output circuits
1
2
6
7
4
ERRIN
V
CC
AGC
MMCR
HDIN
SAW OUT
V
CC
V
CC
V
CC
V
CC
Fig.1
Fig.3
Fig.4
Fig.2
BA9756FS
Multimedia ICs
8
12
11
VREG9
PGND
PWMOUT
V
CC
2
V
CC
1
16
20
19
10
ERROUT
ERRREF
GND
DTC
15
14
V
CC
V
CC
V
CC
Fig.5
Fig.7
Fig.8
Fig.9
Fig.6
BA9756FS
Multimedia ICs
!Electrical characteristics
(unless otherwise noted, Ta=25C, Vcc=15V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Conditions
Test Circuit
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
Fig.10
<Hd input pin>
Input high level voltage
Input low level voltage
Input high level current
Input low level current
<Monostable multivibrator>
Delay time
<SAW GEN>
Output high level
Output low level
Output level f characteristic
<Reference voltage supply>
Output voltage
Max. output current
Output voltage thermal
characteristics
Thermal shutdown
V
IH
V
IL
I
IH
I
IL
T
dl
H
OS
L
OS
f
SAW
V
REF9
I
rmax9
T
REF9
T
dow
3.0
-
-
-
1.80
8.0
0
150
8.937
10
-
100
-
-
360
0
2.15
9.0
0.15
200
9.0
-
0.1
-
V
V
A
A
s
V
V
kHz
V
mA
%
deg
V
IN
= 15V
R = 10k
,C = 220pF
-1dB drop from 30kHz
Guaranteed design parameter
at Ta = 25
0
C, 25
75
C
Guaranteed design parameter
V
CC
1.5
530
-1
2.50
10.0
0.35
-
9.063
-
0.3
-
-
-
-
-
-
-
-
--
BA9756FS
Multimedia ICs
!Measurement circuits
20
1
19
2
18
3
17
4
16
5
15
Vs15
SW15
SW12
1
1
2
Is12
2
6
14
7
13
8
12
9
11
10
M / M
9.0V
ref
Buffer
V
CC
GND
SAW GEN.
V
A
6V
1
SW4
1
1
1
2
SW7
SW6
Vs6
SW8
V
CC
220
2
3
2
1500p
Is8
+
2
1
10k
220p
SG7
A
V
+
Fig.10
Vs1
Vs19
2
SWa
1
1
1
2
1
1
2
2
2
50
100k
SW1
SW16
50
SWb
100k
5k
SWc
19
16
1
V
V
A
Fig.11
100k
50
SG1
15
10
6.8k
5.6k
+
+
19
16
1
V
CC
Fig.12
BA9756FS
Multimedia ICs
!Measurement conditions
(unless otherwise noted, Ta=25C, Vcc=15V)
Parameter
Symbol
Circuit current
<Error amplifier>
Input bias current
Input offset voltage
Output low level voltage
Output high level voltage
Open voltage gain
Max. output current
<PWM amplifier>
Output high level voltage
Output low level voltage
Rise time
Fall time
Min. pulse width
<HD input pin>
Input high level voltage
Input low level voltage
Input high level current
Input low level current
<Monostable multivibrator>
Delay time
<SAW GEN>
Output high level
Output low level
<Reference voltage supply>
Output voltage
Max. output current
Output voltage thermal
characteristic
Thermal shutdown
I
CC
IB
V
IO
V
OL
V
OH
AV
I
OM
V
OH
V
OL
Tr
Td
TMin
V
IH
V
IL
I
IH
I
IL
T
dl
H
OS
L
OS
fsaw
V
REF9
I
rmax9
T
REF9
T
dow
-
1
1
1
1
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
3
3
3
3
2
1
3
3
3
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
-
1
2
2
2
-
2
-
-
-
-
-
-
-
-
-
-
-
-
-
1
2
1
1
-
1
-
-
-
-
-
-
-
-
-
-
-
-
-
Vs1 = 6V, IB = - V
IN
10
5
Vs1 = 6V, V
IO
= (V12 6)
10
2
Vs1 = 5V, Vs13 = 6V
Vs1 = 7V, Vs13 = 6V
SG1: f = 1kHz,V
IN
= 10mV
P-P
Vs1 = 7V, Vs13 = 6V
Vs3 = 6V,Vs11 = 5V, Is9 = - 100mA
Vs3 = 6V,Vs11 = 7V, Is9 = 100mA
SG5: f = 90kHz
SG5: f = 90kHz
SG5: f = 90kHz
SG5: f = 90kHz
SG5: f = 90kHz
-
-
SG5: f = 90kHz, Vs4 = 9V
SG5: f = 90kHz
SG5: f = 90kHz
SG5: f = 30kHz
-
Is = 10mA
Ta = 0C
75 C
Ta = 75C
Switch position
Conditions
SW1 SW3 SW4 SW5 SW6 SW9 SW11
-
1
1
1
1
-
2
-
-
-
-
-
-
-
-
-
-
-
-
SW12 SWa SWb
-
1
2
1
1
-
1
-
-
-
-
-
-
-
-
-
-
-
-
SWc
*
1 The pin 12 output amplitude should be set to V
O
. AV = 20log (V
O
/ V
IN
) [dB]
*
2 For the method by which the output waveform is determined, refer to Fig. 14.
*
3 An input frequency should be measured that produces a level of -1dB for a high output level (H
OS
) for the sawtooth waveform at an input frequency of
30kHz.
*
4 The temperature is measured at the point where the temperature is raised to above Ta = 75C and the output level of pin 9 is high.
*
1
*
2
*
2
*
2
*
2
*
2
*
2
*
2
*
2
*
3
*
4
Output level f
characteristic
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
BA9756FS
Multimedia ICs
!Application example
+
+
+
10
Buffer
GND
N.C.
220
F
220pF
10k
Hd in
N.C.
N.C.
N.C.
N.C.
N.C.
V
CC
M / M
REF
9.0V
SAW GEN.
11
9
12
8
13
7
14
6
15
5
16
4
17
3
18
2
19
1
20
+
15V
+ B
1500pF
1
F
+
+
+
+
HRC
Hd pulse
FBT
15V
Anode Voltage
Note: N.C. pin processing
In order to boost the thermal effect of the IC, we recommend connecting this to the GND or to an adjacent pin.
Fig.13
BA9756FS
Multimedia ICs
Input / output waveforms
3.0V
SG5
(Hd IN)
(SAW OUT)
(PWM OUT)
1.5V
100%
90%
50%
10%
0%
Tr
H
OS
L
OS
TMin.
Tdl
Td
Fig.14
!External dimensions
(Units: mm)
BA9756FS
SSOP-A20
11
10
20
1
0.11
7.8 0.3
5.4 0.2
8.7 0.2
0.15 0.1
0.36 0.1
0.8
1.8 0.1
0.3Min.
0.15