UC3842A

更新时间： 2024-02-13 13:47:35

品牌	Logo	应用领域
美高森美 - MICROSEMI		控制器
页数	文件大小	规格书
8页	229K
描述
CURRENT MODE PWM CONTROLLER

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技术参数
数据手册

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UC3842A 技术参数

生命周期：	Obsolete	Reach Compliance Code：	unknown
风险等级：	5.83	Is Samacsys：	N
控制模式：	CURRENT-MODE	JESD-30 代码：	R-XDFP-F14
端子数量：	14	最高工作温度：	70 °C
最低工作温度：		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：	COMMERCIAL	端子形式：	FLAT
端子节距：	1.27 mm	端子位置：	DUAL
Base Number Matches：	1

UC3842A 数据手册

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

UC184xA/284xA/384xA

C U R R E N T M O D E P W M C O N T R O L L E R

P R O D U C T I O N D A T A S H E E T

ELECTRICAL CHARACTERISTICS (Con't.)

UC184xA/284xA

Min. Typ. Max. Min. Typ. Max.

UC384xA

Parameter

Symbol

Test Conditions

Units

Under-Voltage Lockout Section

Start Threshold

x842A/4A

x843A/5A

x842A/4A

x843A/5A

7.8 8.4 9.0 7.8 8.4 9.0

10 11 8.5 10 11.5

7.0 7.6 8.2 7.0 7.6 8.2

17 14.5 16 17.5

Min. Operation Voltage After Turn-On

PWM Section

Maximum Duty Cycle

x842A/3A

x844A/5A

96 100 94

96 100

Minimum Duty Cycle

Total Standby Section

Start-Up Current

0.3 0.5

Operating Supply Current

Zener Voltage

I_CC

V_Z

I_CC= 25mA

Notes: 2. These parameters, although guaranteed, are not 100% tested in

production.

7. "Temperature stability, sometimes referred to as average temperature

coefficient, is described by the equation:

3. Parameter measured at trip point of latch with V_VFB= 0.

V_REF(max.) - V_REF(min.)

Temp Stability =

∆ V_COMP

T_J(max.) - T (min.)

4. Gain defined as: A_VOL

; 0 ≤ V_ISENSE≤ 0.8V.

∆ V_ISENSE

V_REF(max.) & V_REF(min.) are the maximum & minimum reference

voltage measured over the appropriate temperature range. Note that

the extremes in voltage do not necessarily occur at the extremes in

temperature."

5. Adjust V_CCabove the start threshold before setting at 15V.

6. Output frequency equals oscillator frequency for the UC1842A

and UC1843A. Output frequency is one half oscillator frequency

for the UC1844A and UC1845A.

BLOCK DIAGRAM

V_CC

34V

UVLO

V_REF

5.0V

50mA

Ref

S / R

Hysteresis

6V (1842A/4A)

0.8V (1843A/5A)

GROUND

UVLO

16V (1842A/4A)

8.4V (1843A/5A)

Internal

Bias

2.5V

V_C

V_REF

Good Logic

R_T/C_T

Oscillator

***

OUTPUT

Error Amp

V_FB

PWM

Latch

POWER GROUND

Current Sense

Comparator

COMP

CURRENT SENSE

- V_CCand V_Care internally connected for 8 pin packages.

- POWER GROUND and GROUND are internally connected for 8 pin packages.

- Toggle flip flop used only in x844A and x845A series.

***

Rev. 1.2 12/95

1 2 345 6 7 8

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