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參數(shù)資料
| 型號(hào)： | STA802M |
| 廠商： | SANKEN ELECTRIC CO LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2-Output Separate Excitation Switching Type |
| 中文描述： | 0.5 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, PZIP10 |
| 封裝： | PLASTIC, ZIP-10 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 82K |
| 代理商： | STA802M |
112
I
Selecting External Components
1. Inductors L
1
and L
2
(1) Suitable for switching regulators
Do not use a coil as a noise filter because it generates excess heat.
(2) Appropriate inductance
A low inductance may cause abnormal oscillation, or cause the overcurrent protection circuit to malfunction in the rated current range.
(3) Satisfying the rated current
Exceeding the rated current may generate an extremely high current to flow due to magnetic saturation.
2. Capacitors C
1
, C
2
, and C
3
(1) Satisfy the breakdown voltage and allowable ripple current
Exceeding the ratings of these capacitors or using them without derating may shorten their service lives and also cause abnormal oscillation.
(2) Low impedance (C
2
, and C
3
)
A low-impedance model is recommended for C
2
and C
3
to reduce the ripple voltage and stabilize switching. For stable operation throughout
the input voltage range, however, the DC equivalent series resistance (ESR) of C
2
and C
3
should be 0.1 ohm or less.
3. Capacitors C
4
and C
5
(1) C
4
and C
5
are soft-start capacitors.
I
Selecting Ch2 Output Voltage
When the V
O2
C
ont
terminal voltage is set to 0.5V or less, the output voltage changes to the values shown below. To switch the potential at the V
O2
C
ont
terminal, drive the open collector of the transistor. No external voltage can be applied to the terminal. Leave the terminal open when not in use
because the terminal is already pulled up in the IC. When using terminal no. 9, short it to terminal no. 10.
( ): STA802M
I
Soft Start ON/OFF Circuit
Terminal nos. 3 and 8 are soft start terminals. Connect a capacitor to the terminal to permit a soft start. Output can be turned on and off by using
the soft start terminals. Set the soft start terminal voltage to V
SSL
(0.15V) or less to stop the output. To switch the potential at the soft start terminals,
drive the open collector of the transistor. Since the discharge currents from C
4
and C
5
flow to the ON/OFF control transistor, limit the current for
protection. The SS terminal is pulled up to the power supply in the IC and no external voltage can be applied to the terminal.
9pin
10pin
STA801M
STA802M
OPEN
Low
OPEN
Low
9V
12.1V
9.1V
12.1V
11.5V
15.5V
11.7V
15.7V
STA800M
V
O2
Cont
1
9
10
7
V
O2
9V (9.1V)
12.1V (12.1V)
+
STA800M
V
O2
Cont
1
10
7
V
O2
11.5V (11.7V)
15.5V (15.7V)
+
STA800M
S.S.
C
4
, C
5
3 or 8
+
STA800M
Soft start
Soft start +V
O
ON/OFF
S.S.
C
4
, C
5
3 or 8
+
V
O2
Cont terminal
(1 pin)
V
O2
sensing
terminal
V
O2
output voltage
Low : 0.5V or less
G
STA801M/802M
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