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參數(shù)資料
| 型號(hào)： | TC33163EOETR |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 3.4 A SWITCHING REGULATOR, 55 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | WIDE, SOIC-16 |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | TC33163EOETR |
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11
TC33163
TC33163-1 5/16/00
Power Switching Regulators
Figure 10. Design Equations
The Following Converter Characteristics must be chosen:
VIN
– Nominal operating input voltage.
VOUT
– Desired output voltage.
IOUT
– Desired output current.
IL
– Desired peak-to-peak output ripple current. For maximum output current it is suggested thatIL be chosen to be less than 10% of
the average inductor current IL(AVG). This will help prevent IPK(SWITCH) from reaching the current limit threshold set by RSC. If the
design goal is to use a minimum inductance value, let IL = 2(IL(AVG)). This will proportionally reduce converter output current capability
– Maximum output switch frequency.
VRIPPLE(PP)
– Desired peak-to-peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will
directly affect line and load regulation. Capacitor CO should be low equivalent series resistance (ESR) electrolytic designed for
switching regulator applications.
NOTES:
1. VSAT – Saturation voltage of the output switch, refer to Figures 17 and 18.
2. VF – Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5V.
3. The calculated tON/tOFF must not exceed the minimum guaranteed oscillator charge to discharge ratio of 8, at the minimum
operating input voltage.
Calculation
Step-Down
Step-Up
Voltage-Inverting
tON
tOFF
(Notes 1, 2, 3)
VOUT + VF
VIN – VSAT – VOUT
tON
IOUT
IL(AVG)
IPK(SWITCH)
L
VRIPPLE(PP)
1
8 CO
VOUT
(
+
(ESR)2
CT
tOFF
tON
tOFF
tON
+ 1
32.143 10-6
2
IL(AVG) +
I
L
tON
VIN – VSAT – VOUT
I
L
(
I
L
2
(
VREF R2
R1
+ 1
(
VREF R2
R1
+ 1
(
VREF R2
R1
+ 1
(
2
IL(AVG) +
I
L
2
IL(AVG) +
I
L
32.143 10-6
32.143 10-6
VOUT + VF – VIN
VIN – VSAT
VOUT I + VF
VIN – VSAT
(
tOFF
tON
tOFF
tON
+ 1
(
tOFF
tON
tOFF
tON
+ 1
IOUT
(
tOFF
tON
+ 1
IOUT
(
tOFF
tON
+ 1
RSC
0.25
IPK(SWITCH)
0.25
IPK(SWITCH)
0.25
IPK(SWITCH)
tON
VIN – VSAT
I
L
(
tON
VIN – VSAT
I
L
(
CO
tON IOUT
≈
CO
tON IOUT
≈
I
CT, OSCILLATOR TIMING CAPACITOR (nF)
0.1
1.0
10
Figure 11. Output Switch On-Off Time
Versus Oscillator Timing Capacitor
Figure 12. Oscillator Frequency Change
Versus Temperature
2.0
–55
–25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (°C)
f
OSC
,OSCILLATOR
FREQUENCY
CHANGE
(%)
0
1
2
3
4
5
VCC = 15V
CT = 620pF
VCC = 15V
TA = 25°C
1) tON, RDT = ∞
2) tON, RDT = 20k
3) tON, tOFF, RDT = 10k
4) tOFF, RDT = 20k
5) tOFF, RDT = ∞
–2.0
–4.0
–6.0
1.0
10
100
t O
N
,t
O
FF
,OUTPUT
SWITCH
ON-OFF
TIME
(
s)
TYPICAL CHARACTERISTICS
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