BA9755S Ver la hoja de datos (PDF) - ROHM Semiconductor
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BA9755S Datasheet PDF : 10 Pages
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Multimedia ICs
BA9755S
•Pin descriptions
Pin No.
1
2
3
4
5
6
7
Pin name
GND
PWMOUT
PVCC
HDIN
MMCR
SAWOUT
AGC
Function
Ground
This is the common ground for the small signal system and the power system, and so requires
a stable ground suitable for common impedance.
PWM wave output
Output is fixed at the low level when the protector circuit or thermal shutdown circuit is activated.
Power supply for the power system. Place a decoupling capacitor in proximity to this pin.
HD pulse input. The input signal should be shorter than the rise time (µs).
Internal mono-multi time constant setting.
Shifts the phase of the serrated wave. Use a charge resistance higher than 4.7kΩ.
Serrated wave output. Adjust maximum capacity by changing maximum oscillation frequency.
fMax. 120kHz→C = 1000p, fMax. 100kHz→C = 1200p
fMax. 80kHz→C = 1500p, fMax. 60kHz→C = 2000p
AGC time constant setting.
Set capacity according to the linearity of the minimum oscillation frequency and the response
time during frequency change.
8
ERRIN Input of the error amplifiers feedback voltage.
9
ERRREF Input of the error amplifiers feedback voltage.
When this voltage is given a time constant, the IC soft-starts when the power is turned on.
10 ERROUT Output of the error detection voltage.
Setting the time constant for the protector output suppression time and input of the beam
11 PON DET protectors reference voltage. This stops the protectors until the system stabilizes. The latch
can be unlocked by raising the voltage of this pin above 4.5V.
12
ABLIN
Beam protector input. When the protector is activated, the latch locks and PWM output is fixed
at the low level.
13
XRAYIN
X-ray protector input. When the protector is activated, the latch locks and PWM output is fixed
at the low level.
14
XREF Input of the X-ray protector's reference voltage.
Reference voltage output (6V). Output variation is guaranteed to be 1% or less (with trimming).
15
VREG6 This circuit is completely separate from the 9V system. Output is stopped when the thermal
shutdown circuit is activated. Use a 47µF bypass capacitor.
Reference voltage output (9V). Output variation is guaranteed to be 1% or less (with trimming).
16
VREG9 This circuit is completely separate from the 6V system. Output is stopped when the thermal
shutdown circuit is activated. Use a 10µF bypass capacitor.
17
PROTOUT
Protector output.
Output changes to the high level when the protector circuit or thermal shutdown circuit is activated.
18
VCC
Power supply for the signal system.
Place a decoupling capacitor in proximity to this pin.
3
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