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UC2827-2

更新时间： 2024-11-29 22:41:51
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德州仪器 - TI 控制器
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15页 279K
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Buck Current/Voltage Fed Push-Pull PWM Controllers

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UC2827-2 数据手册

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UC1827-1, UC1827-2  
UC2827-1, UC2827-2  
UC3827-1, UC3827-2  
www.ti.com  
SLUS365A–APRIL 1999–REVISED AUGUST 2005  
BUCK CURRENT/VOLTAGE FED PUSH-PULL  
PWM CONTROLLERS  
FEATURES  
DESCRIPTION  
•
Ideal for Multiple Output and/or High  
Voltage Output Voltage Converters  
The UC3827 family of controller devices provides an  
integrated control solution for cascaded buck and  
push-pull converters. These converters are known as  
current fed or voltage fed push-pull converters and  
are ideally suited for multiple output and/or high  
voltage output applications. In both current fed and  
voltage fed modes, the push-pull switches are driven  
at 50% nominal duty cycles and at one half the  
switching frequency of the buck stage. In the current  
fed mode, the two switches are driven with a speci-  
fied over-lap period to prevent ringing and voltage  
stress on the devices. In the voltage fed mode, the  
two switches are driven with a specified gap time  
between the switches to prevent shorting the trans-  
former across the energy storage capacitor and to  
prohibit excessive currents flowing through the de-  
vices.  
•
•
Up to 500 kHz Operation  
High Voltage, High Current Floating  
Driver for Buck Converter Stage  
•
•
•
UC3827-1 Current Fed Controller has  
Push-Pull Drivers with Overlapping  
Conduction Periods  
UC3827-2 Voltage Fed Controller has  
Push-Pull Drivers with Nonoverlapping  
Conduction Periods  
Average Current Mode, Peak Current  
Mode or Voltage Mode with Input  
Voltage Feedforward Control for Buck  
Power Stage  
•
•
Wide Bandwidth, Low Offset,  
Differential Current Sense Amplifier  
The converter's output voltage is regulated by pulse  
width modulation of the buck switch. The UC3827  
contains complete protection and PWM control func-  
tions for the buck converter. Easy control of the  
floating switch is accomplished by the floating drive  
circuitry. The gate drive waveform is level shifted to  
Precise Short Circuit Current Control  
support an input voltage up to 72 VDC  
.
BLOCK DIAGRAM  
VEAOCEA+ CEAO RAMP  
10  
12  
6
5
Voltage Error  
Amplifier  
14  
16  
13  
7
VEA+  
VEA−  
CEA−  
CSAO  
CSA+  
CSA−  
SS  
0.7 V PWM Comparator  
Current Error  
Amplifier  
R
D
Flying  
Driver  
1
2
3
V+  
+3 V  
ILIM Comparator  
8
S
Q
BUCK  
SRC  
9
Current Sense  
Amplifier  
SS  
INHBT  
UV  
4
OSC  
19  
18  
17  
15  
23  
21 PGND  
SYNC  
CT  
OSC  
Q
DELAY  
T
500 kHz  
MAX  
Push/Pull  
Drivers  
RT  
Q
REF  
24 PUSH  
22 PULL  
VCC  
REF  
&
UVLO  
UVLO  
DELAY  
11  
GND  
20  
DELAY  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 1999–2005, Texas Instruments Incorporated  
1234567...15

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UC2827-2 替代型号

型号 品牌 替代类型 描述 数据表
UC3827-2 TI

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