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參數(shù)資料
| 型號(hào)： | MC33025P |
| 廠商： | MOTOROLA INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | High Speed Double-Ended PWM Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 10/20頁(yè) |
| 文件大小： | 516K |
| 代理商： | MC33025P |
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MC34025 MC33025
10
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION
Pin No.
Function
Description
DIP/SOIC
1
Error Amp
Inverting
Input
This pin is usually used for feedback from the output of the power supply.
2
Error Amp
Noninverting
Input
This pin is used to provide a reference in which an error signal can be produced on the output of the
error amp. Usually this is connected to Vref, however an external reference can also
be used.
3
Error Amp
Output
This pin is provided for compensating the error amp for poles and zeros encountered in the power
supply system, mostly the output LC filter.
4
Clock
This is a bidirectional pin used for synchronization.
5
RT
CT
The value of RT sets the charge current through timing Capacitor, CT.
In conjunction with RT, the timing Capacitor sets the switching frequency. Because this part is a
push–pull output, each output runs at one–half the frequency set at this pin.
6
7
Ramp Input
For voltage mode operation this pin is connected to CT. For current mode operation this pin is
connected through a filter to the current sensing element.
8
Soft–Start
A capacitor at this pin sets the Soft–Start time.
9
Current
Limit/Shutdown
This pin has two functions. First, it provides cycle–by–cycle current limiting. Second, if the
current is excessive, this pin will reinitiate a Soft–Start cycle.
10
Ground
This pin is the ground for the control circuitry.
11
Output A
This is a high current totem pole output.
12
Power Ground
This is a separate power ground return that is connected back to the power source. It is used to
reduce the effects of switching transient noise on the control circuitry.
13
VC
This is a separate power source connection for the outputs that is connected back to the power source
input. With a separate power source connection, it can reduce the effects of switching transient noise
on the control circuitry.
14
Output B
This is a high current totem pole output.
15
VCC
Vref
This pin is the positive supply of the control IC.
16
This is a 5.1 V reference. It is usually connected to the noninverting input of the error amplifier.
Output Voltage
Feedback Input
2
1
3
7
6
5
4
1.25 V
Oscillator
Vref
CT
Figure 21. Voltage Mode Operation
In voltage mode operation, the control range on the output of the Error
Amplifier from 0% to 90% duty cycle is from 2.25 V to 4.05 V.
Output Voltage
Feedback Input
2
1
3
7
6
5
4
1.25 V
Oscillator
Vref
CT
From Current
Sense Element
Figure 22. Current Mode Operation
In current mode control, an RC filter should be placed at the ramp input to filter
the leading edge spike caused by turn–on of a power MOSFET.
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