UC2845D

更新时间： 2024-02-20 01:55:47

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数	文件大小	规格书
11页	100K
描述
CURRENTMODE PWM CONTROLLER

阅读下载

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

UC2845D 技术参数

生命周期：	Obsolete	包装说明：	DFP, FL14,.25
Reach Compliance Code：	unknown	风险等级：	5.84
控制模式：	CURRENT-MODE	JESD-30 代码：	R-XDFP-F14
端子数量：	14	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电流：	0.2 A
封装主体材料：	CERAMIC	封装代码：	DFP
封装等效代码：	FL14,.25	封装形状：	RECTANGULAR
封装形式：	FLATPACK	认证状态：	Not Qualified
子类别：	Switching Regulator or Controllers	表面贴装：	YES
最大切换频率：	500 kHz	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子形式：	FLAT
端子节距：	1.27 mm	端子位置：	DUAL
Base Number Matches：	1

UC2845D 数据手册

UC2842/3/4/5

UC3842/3/4/5

CURRENT MODE PWM CONTROLLER

OPTIMIZED FOR OFF-LINE AND DC TO DC

CONVERTERS

LOW START-UP CURRENT (< 1 mA)

AUTOMATIC FEED FORWARD COMPENSA-

TION

PULSE-BY-PULSECURRENT LIMITING

ENHANCED LOAD RESPONSE CHARAC-

TERISTICS

UNDER-VOLTAGELOCKOUTWITHHYSTER-

ESIS

DOUBLE PULSE SUPPRESSION

HIGH CURRENT TOTEM POLE OUTPUT

INTERNALLY TRIMMED BANDGAP REFER-

ENCE

SO14

Minidip

logicto insure latchedoperation,a PWM compara-

torwhichalsoprovidescurrentlimitcontrol,andato-

tem pole output stage designed to source or sink

high peak current. The output stage, suitable for

drivingN-ChannelMOSFETs,islow intheoff-state.

500 KHz OPERATION

LOW R ERRORAMP

Differencesbetweenmembersof this familyarethe

under-voltage lockout thresholds and maximum

duty cycle ranges. The UC3842 and UC3844 have

UVLO thresholds of 16V (on) and 10V (off), ideally

suited off-line applications The corresponding

thresholds for the UC3843 and UC3845 are 8.5 V

and 7.9 V. The UC3842 and UC3843 can operate

to duty cycles approaching 100%. A range of the

zero to < 50 % is obtained by the UC3844 and

UC3845by theadditionof aninternaltoggleflip flop

which blanksthe outputoff every otherclock cycle.

DESCRIPTION

TheUC3842/3/4/5family ofcontrolICsprovidesthe

necessary features to implement off-line or DC to

DC fixed frequency current mode controlschemes

witha minimalexternalpartscount.Internallyimple-

mentedcircuitsincludeundervoltagelockoutfeatur-

ing start-up current less than 1 mA, a precisionref-

erencetrimmed foraccuracyat theerroramp input,

BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845)

1/11

October 1998

12 3 4 5 6 7...11

下载PDF

与UC2845D相关器件

型号	品牌	描述	获取价格	数据表
UC2845D013TR	STMICROELECTRONICS	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, SO-14	获取价格
UC2845D8	TI	Current Mode PWM Controller	获取价格
UC2845D8	ROCHESTER	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, GREEN, PLASTIC, MS-012AA, SOIC-	获取价格
UC2845D-8	ROCHESTER	1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO8, GREEN, PLASTIC, MS-012AA, SOIC-	获取价格
UC2845D8G4	TI	CURRENT MODE PWM CONTROLLER	获取价格
UC2845D8TR	TI	Current Mode PWM Controller	获取价格