没有合适的资源?快使用搜索试试~ 我知道了~
TI-UC3827-1.pdf
需积分: 8 0 下载量 6 浏览量
2022-10-28
20:30:53
上传
评论 5
收藏 818KB PDF 举报
温馨提示
试读
16页
TI-UC3827-1.pdf
资源推荐
资源详情
资源评论
R
D
QS
20
DELAY
23
GND
11
VCC
REF
15
RT
17
CT
18
SYNC
19
CSA−
9
CSA+
8
SS
4
CSAO
7
CEA−
13
VEA−
16
VEA+
14
22
24
3
2
1
RAMPCEA+
12
CEAOVEAO
10
PULL
PGND
PUSH
SRC
BUCK
V+
DELAY
DELAY
T
Q
Q
REF
&
UVLO
SS
INHBT
UV
OSC
500 kHz
MAX
6 5
21
Current Sense
Amplifier
ILIM Comparator
+3 V
Current Error
Amplifier
PWM Comparator0.7 V
Flying
Driver
Push/Pull
Drivers
OSC
UVLO
Voltage Error
Amplifier
+
UC2827-1, UC2827-2
UC3827-1, UC3827-2
www.ti.com
SLUS365D –APRIL 1999– REVISED APRIL 2011
BUCK CURRENT/VOLTAGE FED PUSH-PULL
PWM CONTROLLERS
Check for Samples: UC2827-1, UC2827-2, UC3827-1, UC3827-2
1
FEATURES
DESCRIPTION
• Ideal for Multiple Output and/or High
The UC3827 family of controller devices provides an
Voltage Output Voltage Converters
integrated control solution for cascaded buck and
• Up to 500 kHz Operation
push-pull converters. These converters are known as
• High Voltage, High Current Floating
current fed or voltage fed push-pull converters and
Driver for Buck Converter Stage
are ideally suited for multiple output and/or high
voltage output applications. In both current fed and
• UC3827-1 Current Fed Controller has
voltage fed modes, the push-pull switches are driven
Push-Pull Drivers with Overlapping
at 50% nominal duty cycles and at one half the
Conduction Periods
switching frequency of the buck stage. In the current
• UC3827-2 Voltage Fed Controller has
fed mode, the two switches are driven with a
Push-Pull Drivers with Nonoverlapping
specified over-lap period to prevent ringing and
Conduction Periods
voltage stress on the devices. In the voltage fed
mode, the two switches are driven with a specified
• Average Current Mode, Peak Current
gap time between the switches to prevent shorting
Mode or Voltage Mode with Input
the transformer across the energy storage capacitor
Voltage Feedforward Control for Buck
and to prohibit excessive currents flowing through the
Power Stage
devices.
• Wide Bandwidth, Low Offset,
The converter's output voltage is regulated by pulse
Differential Current Sense Amplifier
width modulation of the buck switch. The UC3827
• Precise Short Circuit Current Control
contains complete protection and PWM control
functions 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
support an input voltage up to 72 V
DC
.
BLOCK DIAGRAM
1
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.
Copyright © 1999–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
UC2827-1, UC2827-2
UC3827-1, UC3827-2
SLUS365D –APRIL 1999– REVISED APRIL 2011
www.ti.com
DESCRIPTION (CONTINUED)
The UC3827 can be set up in traditional voltage mode control using input voltage feedforward technique or in
current mode control. Using current mode control prevents potential core saturation of the push-pull transformer
due to mismatches in timing and in component tolerances. With average current mode control, precise control of
the inductor current feeding the push-pull stage is possible without the noise sensitivity associated with peak
current mode control. The UC3827 average current mode loop can also be connected in parallel with the voltage
regulation loop to assist only in fault conditions.
Other valuable features of the UC3827 include bidirectional synchronization capability, user programmable
overlap time (UC3827-1), user programmable gap time (UC3827-2), a high bandwidth differential current sense
amplifier, and soft start circuitry.
ORDERING INFORMATION
(1)
PACKAGES
T
A
= T
J
PUSH-PULL TOPOLOGY
SOIC-24 PDIP-24 PLCC-28
Current Fed UC2827DW-1 UC2827N-1 -
-40°C to 85°C
Voltage Fed UC2827DW-2 UC2827N-2 -
Current Fed UC3827DW-1 UC3827N-1 UC3827Q-1
0°C to 70°C
Voltage Fed UC3827DW-2 UC3827N-2 -
(1) The DW and Q packages are also available taped and reeled. Add a TR suffix to the device type (i.e., UC2827DWTR-1).
THERMAL INFORMATION
UC2827-1, UC2827-1,
UC2827-2, UC2827-2,
UC3827-1, UC3827-1,
THERMAL METRIC UNITS
UC3827-2 UC3827-2
N J
24 PINS 24 PINS
θ
JA
Junction-to-ambient thermal resistance
(1)
60 70 to 80
°C/W
θ
JCtop
Junction-to-case (top) thermal resistance
(2)
30 28
(1) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
(2) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific
JEDEC-standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
THERMAL INFORMATION
UC2827-1, UC2827-1,
UC2827-2, UC2827-2,
UC3827-1, UC3827-1,
THERMAL METRIC UNITS
UC3827-2 UC3827-2
DW
(1)
QLCC
28 PINS 28 PINS
θ
JA
Junction-to-ambient thermal resistance
(2)
71 to 83 40 to 65
°C/W
θ
JCtop
Junction-to-case (top) thermal resistance
(3)
24 30
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as
specified in JESD51-7, in an environment described in JESD51-2a.
(3) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific
JEDEC-standard test exists, but a close description can be found in the ANSI SEMI standard G30-88.
2 Copyright © 1999–2011, Texas Instruments Incorporated
UC2827-1, UC2827-2
UC3827-1, UC3827-2
www.ti.com
SLUS365D –APRIL 1999– REVISED APRIL 2011
ABSOLUTE MAXIMUM RATINGS
(1)
UC2827-1
UC2827-2
UNITS
UC3827-1
UC3827-2
Supply voltage, VCC 20
CEAO, CEA+, CEA-, CSAO, CSA+, CSA-, CT, DELAY, PUSH, PULL,
–0.3 to 5
RAMP, RT, SS, SYNC, VEA+, VEAO,
V
Input voltage range
V+ and BUCK 90
SRC 90-VCC
I/O continuous ±250 mA
BUCK driver
I/O peak ±1 A
I/O continuous ±200 mA
PUSH/PULL driver
I/O peak ±0.8 A
Storage temperature –65 to 150
Junction temperature –55 to 150 °C
Lead temperature (soldering, 10 sec) 300
(1) Voltages are referenced to ground. Currents are positive into, negative out of the specified terminal. Consult Packaging section of
databook for thermal limitations and considerations of packages.
ELECTRICAL CHARACTERISTICS
Unless otherwise spsecified, V
VCC
= 15 V, V
V+
= 14.3 V, C
CT
= 340 pF, R
RT
= 10 kΩ, R
DELAY
= 24.3 kΩ, V
SRC
= V
GND
= V
BUCK
=
V
PUSH
= V
PULL
outputs no load, T
J
= T
A
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY
VCC UVLO, Turn-on 8.3 8.8 9.5 V
Hysteresis 0.9 1.2 1.5 V
I
VCC
Supply current start V
VCC
= 8 V 1000 µA
I
VCC
Supply current run 32 45 mA
I
V+
buck high 0.2 1 2 mA
VOLTAGE ERROR AMPLIFIER
IB 0.5 3 µA
VIO 10 mV
AVOL 80 95 dB
GBW
(1)
Gain bandwidth 1 4 MHz
V
OL
Low-level output voltage I
VEAO
= 0 µA (No load) 0.3 0.5 V
V
OH
High-level output voltage I
VEAO
= 0 µA (No load) 2.85 3 3.20 V
CURRENT SENSE AMPLIFIER
IB –1 –5 µA
VIO 5 mV
AVOL 80 110 dB
GBW
(1)
Gain bandwidth 15 29 MHz
V
OL
Low-level output voltage I
CEAO
= 0 µA (No load) 0.25 0.5 V
V
OH
High-level output voltage I
CEAO
= 0 µA (No load) 3 3.3 V
CMRR Common mode range
(1)
-0.3 2 V
(1) Ensured by design. Not production tested.
Copyright © 1999–2011, Texas Instruments Incorporated 3
剩余15页未读,继续阅读
资源评论
不觉明了
- 粉丝: 3211
- 资源: 5589
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
最新资源
- tensorflow-rocm-2.10.1.540-cp310-cp310-manylinux2014-x86-64.whl
- tensorflow-rocm-2.10.1.540-cp37-cp37m-manylinux2014-x86-64.whl
- tensorflow-2.9.1-cp37-cp37m-win-amd64.whl
- stream.x86.zh-cn.datstream.x86.zh-cn.datstream.x86.zh-cn.dat
- 员工考勤系统.docx
- stream.x64.zh-cn.datstream.x64.zh-cn.datstream.x64.zh-cn.dat
- stream.x86.x-none.datstream.x86.x-none.dat
- 使用JAVA调用GDAL实现KMZ和KML文件解析源代码
- 企业级网络设计与配置实战案例
- Elasticsearch实战
资源上传下载、课程学习等过程中有任何疑问或建议,欢迎提出宝贵意见哦~我们会及时处理!
点击此处反馈
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功