欢迎访问ic37.com |
会员登录 免费注册
发布采购

CS2843A 参数 Datasheet PDF下载

CS2843A图片预览
型号: CS2843A
PDF下载: 下载PDF文件 查看货源
内容描述: 离线电流模式PWM控制电路欠压锁定 [Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout]
分类和应用:
文件页数/大小: 6 页 / 158 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
 浏览型号CS2843A的Datasheet PDF文件第2页浏览型号CS2843A的Datasheet PDF文件第3页浏览型号CS2843A的Datasheet PDF文件第4页浏览型号CS2843A的Datasheet PDF文件第5页浏览型号CS2843A的Datasheet PDF文件第6页  
CS2842A/3843A SERIES
CS2842A/CS3842A
CS2843A/CS3843A
Off-Line Current Mode PWM Control
Circuit with Undervoltage Lockout
Description
The CS284XA, CS384XA provides all
the necessary features to implement
off-line fixed frequency current-mode
control with a minimum number of
external components.
The CS384XA family incorporates a
new precision temperature-controlled
oscillator with an internally trimmed
discharge current to minimize varia-
tions in frequency. A precision duty-
cycle clamp eliminates the need for an
external oscillator when a 50% duty-
cycle is used. Duty-cycles greater than
50% are also possible. On board logic
ensures that V
REF
is stabilized before
the output stage is enabled. Ion
implant resistors provide tighter con-
trol of undervoltage lockout.
Other features include low start-up
current, pulse-by-pulse current limit-
ing, and a high-current totem pole out-
put for driving capacitive loads, such
as the gate of power MOSFET. The out-
put is LOW in the off state, consistent
with N-channel devices.
The CS384XA series of current-mode
control ICs are available in 8 and14
lead packages for surface mount (SO)
applications as well as 8 lead PDIP
packages.
Features
s
Optimized for Off-line
Control
s
Internally Trimmed
Temperature
Compensated Oscillator
s
Maximum Duty-cycle
Clamp
s
V
REF
stabilized before
Output Stage is Enabled
s
Low Start-up Current
s
Pulse-by-pulse Current
Limiting
s
Improved Undervoltage
Lockout
s
Double Pulse Suppression
s
1% Trimmed Bandgap
Reference
s
High Current Totem Pole
Output
Absolute Maximum Ratings
Supply Voltage (I
CC
<30mA).........................................................................Self Limiting
Supply Voltage (Low Impedance Source) .................................................................30V
Output Current..............................................................................................................±1A
Output Energy (Capacitive Load) ................................................................................5µJ
Analog Inputs (V
FB
, Sense) ...........................................................................-0.3V to 5.5V
Error Amp Output Sink Current .............................................................................10mA
Lead Temperature Soldering
Wave Solder (through hole styles only) ..........10 sec. max, 260°C peak
Reflow (SMD styles only) ...........60 sec. max above 183°C, 230°C peak
Block Diagram
V
CC
34V
Gnd
16V/10V
(8.4V/7.6V)
2.50V
OSC
Output
Enable
NOR
V
OUT
+
V
FB
Error
Amplifier
COMP
Sense
( ) Indicates CS-2843A/3843A
V
C
R
1 V
2 R
S
R
Current
Sensing
Comparator
PWM
Latch
Undervoltage
Lock-out Circuit
Set/
5V
Reset Reference
Internal
Bias
V
REF
V
CC
Pwr
Package Options
8 Lead PDIP & SO Narrow
COMP
V
FB
Sense
OSC
1
2
3
4
8
7
6
5
V
REF
V
CC
V
OUT
Gnd
14 Lead SO Narrow
COMP
1
NC
2
V
FB
3
NC
4
Pwr Gnd
14
13
12
11
10
9
8
V
REF
NC
V
CC
V
CC
Pwr
V
OUT
Pwr Gnd
Gnd
Oscillator
Sense
5
NC
6
OSC
7
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 10/23/98
1
A
®
Company