AS3843NT 查看數據表（PDF） - Astec Semiconductor => Silicon Link

零件编号

产品描述 (功能)

生产厂家

AS3843NT

Current Mode Controller

Astec Semiconductor => Silicon Link 

AS384x

Current Mode Controller

Electrical Characteristics (contÕd)

Electrical characteristics are guaranteed over full junction temperature range (0 to 105¡C). Ambient temperature must be derated

based on power dissipation and package thermal characteristics. The conditions are: VCC = 15 V, RT = 10 k½, and CT = 3.3 nF, unless

otherwise stated. To override UVLO, VCC should be raised above 17 V prior to test.

Parameter

Symbol Test Condition

Min.

Typ.

Max. Unit

PWM

Maximum Duty Cycle

Minimum Duty Cycle

Maximum Duty Cycle

Minimum Duty Cycle

Supply Current

Dmax

Dmin

Dmax

Dmin

3842/3

3842/3

3844/5

3844/5

94

97

100

%

0

%

49

49.5

50

%

0

%

Start-up Current

ICC

3842/4, VFB = VSENSE = 0 V, VCC = 14 V

0.5

1.0

mA

3843/5, VFB = VSENSE = 0 V, VCC = 7 V

0.3

0.5

mA

Operating Supply Current

ICC

9

17

mA

VCC Zener Voltage

VZ

ICC = 25 mA

30

V

Notes:

1. This parameter is not 100% tested in production.

2. Parameter measured at trip point of PWM latch.

3. Transfer gain is the relationship between current sense input and corresponding error amplifier output at the PWM latch trip point

and is mathematically expressed as follows:

A=

∆ I COMP

∆VSENSE

;

Ð

0.2

≤ VSENSE ≤

0.8 V

4. At the over-temperature threshold, TOT, the oscillator is disabled. The 5 V reference and the PWM stages, including the PWM latch,

remain powered.

ASTEC Semiconductor

6

Share Link: