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參數資料
| 型號： | MC33025PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩壓器 |
| 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： | 1/20頁 |
| 文件大小： | 482K |
| 代理商： | MC33025PG |
Semiconductor Components Industries, LLC, 2005
October, 2005 Rev. 7
1
Publication Order Number:
MC34025/D
MC34025, MC33025
High Speed DoubleEnded
PWM Controller
The MC34025 series are high speed, fixed frequency, doubleended
pulse width modulator controllers optimized for high frequency
operation. They are specifically designed for OffLine and
DCtoDC converter applications offering the designer a cost
effective solution with minimal external components. These
integrated circuits feature an oscillator, a temperature compensated
reference, a wide bandwidth error amplifier, a high speed current
sensing comparator, steering flipflop, and dual high current totem
pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cyclebycycle
current limiting, and a latch for single pulse metering.
The flexibility of this series allows it to be easily configured for
either current mode or voltage mode control.
Features
50 ns Propagation Delay to Outputs
Dual High Current Totem Pole Outputs
Wide Bandwidth Error Amplifier
FullyLatched Logic with Double Pulse Suppression
Latching PWM for CycleByCycle Current Limiting
SoftStart Control with Latched Overcurrent Reset
Input Undervoltage Lockout with Hysteresis
Low Startup Current (500 A Typ)
Internally Trimmed Reference with Undervoltage Lockout
45% Maximum Duty Cycle (Externally Adjustable)
Precision Trimmed Oscillator
Voltage or Current Mode Operation to 1.0 MHz
Functionally Similar to the UC3825
PbFree Packages are Available*
Figure 1. Simplified Application
Error
Amp
Oscillator
4
16
V
ref
Clock
5
6
7
R
T
C
T
3
Ramp
Error Amp
Output
Noninverting
2
Inverting
Input 1
8
SoftStart
SoftStart
Latching
PWM and
Steering
Flip Flop
Ground
10
9
Current
Limit/
Shutdown
Output B
14
V
C
13
V
CC
15
UVLO
5.1V
Reference
11
Input
Power
Ground
12
Output A
This device contains 227 active transistors.
PDIP16
P SUFFIX
CASE 648
1
16
SO16WB
DW SUFFIX
CASE 751G
1
16
MARKING
DIAGRAMS
PIN CONNECTIONS
1
16
MC3x025P
AWLYYWWG
11
5
2
1
Error Amp
Noninverting Input
Error Amp Output
Current Limit/
Shutdown
Ground
Output A
Power Ground
V
C
Output B
V
CC
V
ref
9
10
12
13
14
15
16
8
7
6
4
3
(Top View)
SoftStart
Ramp
C
T
R
T
Clock
Error Amp
Inverting Input
http://onsemi.com
*For additional information on our PbFree strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
16
1
MC3x025DW
AWLYYWWG
x
A
WL
YY
WW
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbFree Package
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
ORDERING INFORMATION
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