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參數(shù)資料
| 型號(hào)： | TC33063AEOATR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.35 A SWITCHING REGULATOR, 42 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 121K |
| 代理商： | TC33063AEOATR |
7
TC33063A
DC/DC Converter Control Circuits
TC33063A -1 5/9/00
Converter
Inductance (
H)
Turns/Wire
Step-Up
170
38 Turns of #22 AWG
Step-Down
220
48 Turns of #22 AWG
Voltage-Inverting
88
28 Turns of #22 AWG
All inductors are wound on Magnetic Inc. 55117 toroidal core.
Inductor Data
Design Formula Table
Calculations
Step-Up
Step-Down
Voltage-Inverting
tON / tOFF
VOUT + VF – VIN(min)
VOUT + VF
I VOUT I + VF
VIN(min) – VSAT
VIN(min) – VSAT – VOUT
VIN – VSAT
(tON + tOFF)1
1
ff
f
tOFF
tON + tOFF
tON
+ 1
tON
+ 1
tON
+ 1
tOFF
tON
(tON + tOFF) – tOFF
CT
4.0 x 10
–5 t
ON
4.0 x 10
–5 t
ON
4.0 x 10
–5 t
ON
IPK(SWITCH)
2I OUT(max)
(
tON
+ 1
)
2I OUT(max)
(
tON
+ 1
)
tOFF
RSC
0.3/IPK(SWITCH)
L(min)
(VIN(min) – VSAT)tON(max) (VIN(min) – VSAT – VOUT)tON(max) (VIN(min) – VSAT)tON(max)
IPK(SWITCH)
IPK(SWITCH
IPK(SWITCH)
CO
9
IOUTtON
IPK(SWITCH)(tON + tOFF)
9
IOUTtON
VRIPPLE(pp)
8VRIPPLE(pp)
VRIPPLE(pp)
VSAT = Saturation voltage of the output switch.
VF = Forward voltage drop of the output rectifier.
The following power supply characteristics must be chosen:
VIN – Nominal input voltage.
VOUT – Desired output voltage, IVOUTI = 1.25
(1 + R2 )
IOUT – Desired output current.
R1
fMIN – Minimum desired output switching frequency at the selected values of VIN and IO .
VRIPPLE(pp) – Desired peak–to–peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its
equivalent series V(pp) – resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the
line and load regulation.
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