MC34129D Freescale Semiconductor, MC34129D Datasheet - Page 11

• Manufacturer Part Number: MC34129D
• Description: IC CTLR CURRENT MODE 14-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC34129D

• Applications: Telecommunications
• Current - Supply: 2.5mA
• Voltage - Supply: 4 V ~ 12 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q1707365A

MOTOROLA ANALOG IC DEVICE DATA
f =
Figure 22. Discrete Step Reduction of Clamp Level
R A
R B
(R A + 2R B )C
6
5
C
2
275mV
R
S
1.44
Q
8
1
Figure 20. External Duty Cycle Clamp
5.0V
I pk(max) =
5.0k
5.0k
5.0k
+
and Multi–Unit Synchronization
+
–
+
–
+
–
1.675 – (V F(D1) + V F(D2) )
MC1455
4
D max =
R
S
Q
R S
R A + 2R B
R B
1.25V
Freescale Semiconductor, Inc.
+
–
3
7
For More Information On This Product,
6
5
4
To Additional
MC34129’s
1
2
3
8
9
10
11
D1
Go to: www.freescale.com
120 A
2.5V
MC34129 MC33129
D2
OSC
V in
Q1
R S
+
–
C Soft–Start
If:
Figure 23. Adjustable Reduction of Clamp Level
12
4
7
6
5
R1 + R2
The external 9.1 V zener is required when driving low threshold MOSFETs.
1.25 V
275mV
R
S
2.5V
Q
OSC
– +
1.0 mA
+
Figure 21. Bootstrap Startup
+
–
Then: I pk(max)
R
S
Q
– +
+
–
– +
1.25V
+
–
R2
R1
1.25
– +
1.25V
+ 1
+
–
R S
– 0.275
11
1
2
3
8
9
10
R1
11
13
14
9.1
V
10
8
9
1
2
3
R2
+
V in
Q2
Q1
R S
11
V in