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參數(shù)資料
| 型號(hào)： | MC34268STT3 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 通用總線功能 |
| 英文描述： | SCSI-2 Active Terminator Regulator |
| 中文描述： | BUS TERMINATOR SUPPORT CIRCUIT, PDSO4 |
| 封裝： | SOT-223, 4 PIN |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 115K |
| 代理商： | MC34268STT3 |
MC34268
http://onsemi.com
3
Figure 3. Typical SCSI Application
1N5819
To SCSI Bus
MC34268
SCSI
Regulator
110
10
10
5.0V
Vin
VO
Gnd
CO
Figure 3 is a circuit of a typical SCSI terminator
application. The MC34268 is designed specifically to
provide 2.85 V required to drive a SCSI–2 bus. The output
current capability of the regulator is in excess of 800 mA;
enough to drive standard SCSI–2, fast SCSI–2, and some
wide SCSI–2 applications. The typical dropout voltage is
less than 1.0 V, allowing the IC to regulate to input voltages
less than 4.0 V. Internal protective features include current
and thermal limiting.
The MC34268 requires an external 10
μ
F capacitor with
an ESR of less than 10
for stability over temperature.
With economical electrolytic capacitors, cold temperature
operation can pose a stability problem. As temperature
decreases, the capacitance also decreases and the ESR
increases, which could cause the circuit to oscillate.
Tantalum capacitors may be a better choice if small size is
a requirement. Also, the capacitance and ESR of a tantalum
capacitor is more stable over temperature.
,
θ
J
Figure 4. SOP–8 Thermal Resistance versus
P.C.B. Copper Length
0
10
20
30
40
L, LENGTH OF COPPER (mm
Figure 5. DPAK Thermal Resistance
versus P.C.B. Copper Length
0
10
20
30
40
50
60
L, LENGTH OF COPPER FLAGS (mm
°
,
θ
J
°
70
90
80
70
60
50
40
180
160
120
80
40
0
L
ééé
9.0 mm
éé
éé
2.0 oz
L
P.C. Board Heatsink Example
ééééé
ééééé
ééééé
ééééé
Copper
P.C. Board Heatsink Example
ORDERING INFORMATION
Device
Package
Shipping Information
MC34268D
MC34268DR2
MC34268DT
MC34268DTRK
MC34268STT3
SO–8
SO–8
DPAK
DPAK
SOT–223
98 Units / Rail
2500 Units / Tape & Reel
75 Units / Rail
2500 Units / Tape & Reel
4000 Units / Tape & Reel
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