參數(shù)資料
型號(hào): MC33129P
廠商: MOTOROLA INC
元件分類: 穩(wěn)壓器
英文描述: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
中文描述: 1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDIP14
封裝: PLASTIC, DIP-14
文件頁(yè)數(shù): 11/16頁(yè)
文件大小: 347K
代理商: MC33129P
MC34129 MC33129
11
MOTOROLA ANALOG IC DEVICE DATA
Figure 20. External Duty Cycle Clamp
and Multi–Unit Synchronization
Figure 21. Bootstrap Startup
Figure 22. Discrete Step Reduction of Clamp Level
Figure 23. Adjustable Reduction of Clamp Level
The external 9.1 V zener is required when driving low threshold MOSFETs.
CSoft–Start
12
7
6
5
4
2.5V
OSC
R
S
Q
1.25V
13
14
9.1
V
8
9
10
11
1
2
3
Q2
Vin
+
+
+
Ipk(max) =
1.675 – (VF(D1) + VF(D2))
RS
275mV
R
S
Q
1.25V
8
9
10
11
1
2
3
Vin
Q1
RS
D1
D2
120
μ
A
+
+
+
275mV
R
S
Q
1.25V
8
9
10
11
1
2
3
Vin
Q1
RS
R1
R2
+
+
+
If:
1.25 V
R1 + R2
1.0 mA
Then: Ipk(max)
1.25
R2
R1
+ 1
– 0.275
RS
f =
1.44
(RA + 2RB)C
Dmax =
RB
5.0V
RA
RB
8
6
5
2
C
5.0k
4
R
Q
S
MC1455
3
7
6
5
4
2.5V
OSC
To Additional
MC34129’s
+
5.0k
5.0k
1
+
+
RA + 2RB
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MC33129 HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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MC34129P HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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