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BA9756FS Datasheet(PDF) 2 Page - Rohm

No. de pieza BA9756FS
Descripción Electrónicos  High-voltage control circuit for CRT displays
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BA9756FS Datasheet(HTML) 2 Page - Rohm

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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)
VCC2
(Power VCC)
ERROUT
(error amplifier output)
N.C.
VCC1
(signal VCC)
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 VCC 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 (VCC)
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
µs (Typ. at 90kHz).
11
12
14
VCC2
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
Ω 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.


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