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參數(shù)資料
| 型號(hào)： | LA3246 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 音頻放大器 |
| 英文描述： | Stereo Preamplifier for Compact Double Cassette Playback-only Use |
| 中文描述： | 立體聲放大器的緊湊型雙卡式播放，僅使用 |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 441K |
| 代理商： | LA3246 |
.
Control circuit
The control circuit for each CONT pin is configured as shown below. When a voltage more than a given value is applied,
the level on the pin is fixed by clamp diode D1.
Description
.
Switching level V
SW
of the control circuit is fixed by voltage V13 which is 1/2 of the voltage on pin 13.
V
SW
= 1/2 V13
.
Clamp voltage V
CLP
at the time a voltage is applied to the CONT pin
V
CLP
= 1/2
×
V13 + V
D
1 + V
BE
1
= 1/2
×
V13 + 0.6 (0.3) + 0.6
where 0.9 V is for pin 9.
= 1/2
×
V13 + (0.9 or 1.2)
.
The maximum voltage at which the CONT pin is brought to GND level is fixed by the level at which the Q2 is completely
turned OFF.
This level is:
1/2
×
V13 – V
BE
2 = 1/2
×
V13 – 0.6 [V]
1.2 V is for pins 6, 15.
Switching is performed at a level less than this.
.
To turn ON/OFF
When turning ON:
.
V
CONT
min = R
×
I
B
max + Operation finish voltage.
I
B
= 4 μA
Operation finish voltage
Pins 6, 15 : = 1/2
×
V13
Pin 9 :
= 1/2
×
V13 + V
BE
= 1/2
×
V13 + 0.6 [V]
.
V
CONT
max = R
×
I
B
max + Clamp voltage
R is restricted by I
B
max.
When the supply voltage is fixed, clamp voltage V
CLP
is fixed. When resistor R is fixed based on a balance with capacitor C,
resistor R is restricted by V
CONT
max. as shown below.
V
CONT
max – V
CLP
R
I
B
max = 100 μA
^
The minimum value of resistor R is fixed by this equation.
Example
Assuming V
CC
= 10 V, V
CONT
max = 10 V, Rmin is 50 k
.
Therefore, R = 100 k
presents no problem.
When turning OFF:
Bring the level on the CONT pin to a level less than:
1/2
×
V13 – V
BE
2 = 1/2
×
V13 – 0.6 [V]
Unit (resistance:
, capacitance: F)
Control pin
Current route
at clamp mode
Note: For D1, a Schottky diode is used for pin 9
and a silicon diode is used for pins 6, 15.
To turn ON the control circuit to finish the
operation, I
B
is required. Control voltage
V
OUT
is obtained with I
B
of 4 μA min.
LA3246
No.2651-7/13
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