6

ASTEC Semiconductor

AS384x

Current Mode Controller

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: V

otherwise stated. To override UVLO, V

Parameter

Symbol

Test Condition

Min.

Typ.

Max.

Unit

PWM

Maximum Duty Cycle

D

max

3842/3

94

97

100

%

Minimum Duty Cycle

D

min

3842/3

0

%

Maximum Duty Cycle

D

max

3844/5

49

49.5

50

%

Minimum Duty Cycle

D

min

3844/5

0

%

Supply Current

Start-up Current

I

CC

3842/4, V

0.5

1.0

mA

3843/5, V

0.3

0.5

mA

Operating Supply Current

I

CC

9

17

mA

V

V

Z

I

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:

4. At the over-temperature threshold, T

remain powered.

=

Ð

A

I

V

V

COMP

SENSE

≤

≤

∆

∆

;

0.2

V

0.8

SENSE