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參數(shù)資料
| 型號： | MC33025PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 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： | LEAD FREE, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 482K |
| 代理商： | MC33025PG |
MC34025, MC33025
http://onsemi.com
10
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 V
ref
, 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
R
T
The value of R
T
sets the charge current through timing Capacitor, C
T
.
6
C
T
In conjunction with R
T
, the timing Capacitor sets the switching frequency. Because this part is a
pushpull output, each output runs at onehalf the frequency set at this pin.
7
Ramp Input
For voltage mode operation this pin is connected to C
T
. For current mode operation this pin is
connected through a filter to the current sensing element.
8
SoftStart
A capacitor at this pin sets the SoftStart time.
9
Current
Limit/Shutdown
This pin has two functions. First, it provides cyclebycycle current limiting. Second, if the current is
excessive, this pin will reinitiate a SoftStart 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
V
C
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
V
CC
This pin is the positive supply of the control IC.
16
V
ref
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
V
ref
C
T
Figure 22. 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
V
ref
C
T
From Current
Sense Element
Figure 23. 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 turnon of
a power MOSFET.
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