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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 121K |
| 代理商： | TC33063AEOATR |
TC33063A
4
TC33063A -1 5/9/00
DC/DC Converter Control Circuits
Figure 2. External Current Boost Connections for IC Peak Greater than 1.5A
2a. External NPN Switch
2b. External NPN Saturated Switch (See Note Below)
1
2
6
RSC
VIN
VOUT
8
7
1
R
2
6
RSC
VIN
VOUT
R
0 for
Constant VIN
8
7
NOTE: If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (
≤ 300mA)
and high driver currents (.30mA), it may take up to 2.0
sec to come out of saturation. This condition will shorten the off time at
frequencies .30kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the
output switch cannot saturate. If a non–Darlington configuration is used, the following output drive condition is recommended.
Figure 3. Step-Down Converter
S
R
Q
Q2
Q1
1N5819
L
220
H
CT
COUT
VOUT
5.0V/500mA
VOUT
Comparator
+
–
1.25V
Reference
Regulator
1
2
3
4
470
F
6
5
RSC
0.33
VIN
25V
R2
3.6k
R1
1.2k
VCC
+
8
7
470pF
IPK
Oscillator
100
F
100
F
Optional Filter
+
1.0
H
Test
Conditions
Results
Line Regulation
VIN = 15V to 25V, IOUT = 500mA
12mV =
±0.12%
Load Regulation
VIN = 25V, IOUT = 50mA to 500mA
3.0mV =
±0.03%
Output Ripple
VIN = 25V, IOUT = 500mA
120mVpp
Short Circuit Current
VIN = 25V, RL = 0.1
1.1A
Efficiency
VIN = 25V, IOUT = 0.1
83.7%
Output Ripple With Optional Filter
VIN = 25V, IOUT = 500mA
40mVpp
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