參數(shù)資料
型號: 33063AP
廠商: Motorola, Inc.
英文描述: DC-to-DC CONVERTER CONTROL CIRCUITS
中文描述: 型DC - DC變換器控制電路
文件頁數(shù): 5/12頁
文件大?。?/td> 200K
代理商: 33063AP
MC34063A MC33063A
5
MOTOROLA ANALOG IC DEVICE DATA
170
μ
H
L
8
180
7
Rsc
0.22
6
Vin
12 V
100
+
5
R1
2.2 k
R2
47 k
S
Q
R
Q2
Q1
Ipk
Osc
CT
VCC
+
Comp.
1.25 V
Ref
Reg
1
2
3
4
1N5819
CT
1500
pF
330
CO
+
Vout
28 V/175 mA
Vout
1.0
μ
H
+
100
Optional Filter
Figure 7. Step–Up Converter
Test
Conditions
Results
Line Regulation
Vin = 8.0 V to 16 V, IO = 175 mA
Vin = 12 V, IO = 75 mA to 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
30 mV =
±
0.05%
Load Regulation
10 mV =
±
0.017%
Output Ripple
400 mVpp
Efficiency
87.7%
Output Ripple With Optional Filter
40 mVpp
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 5)
8
7
6
Rsc
Vin
1
2
Vout
R
R
constant Vin
0 for
NOTE:
5.If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (
300 mA) and high driver currents
(
30 mA), it may take up to 2.0
μ
s to come out of saturation. This condition will shorten the off time at frequencies
30 kHz, 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.
8
7
6
Rsc
Vin
1
2
Vout
Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
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