AS2844 datasheet(6/20 Pages) ETC

6 / 20 page

AS2842/3/4/5

Current Mode Controller

ASTEC Semiconductor

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, TOT, the oscillator is disabled. The 5 V reference and the PWM stages, including the PWM

latch, remain powered.

Electrical Characteristics (cont’d)

Electrical characteristics are guaranteed over full junction temperature range (-40 to 105

° C ). Ambient temperature must be derated based

on power dissipation and package thermal characteristics. The conditions are: VCC = 15 V, RT = 10 k

Ω,andCT=3.3nF,unlessotherwisestated.

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

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

COMP

SENSE

=−

≤

∆

;

0.2

0.8

SENSE

PWM

Maximum Duty Cycle

Dmax

2842/3

100

Minimum Duty Cycle

Dmin

2842/3

Maximum Duty Cycle

Dmax

2844/5

49.5

Minimum Duty Cycle

Dmin

2844/5

Supply Current

Start-up Current

ICC

2842/4, VFB = VSENSE = 0 V, VCC = 14 V

0.5

1.0

2843/5, VFB = VSENSE = 0 V, VCC = 7 V

0.3

0.5

Operating Supply Current

ICC

917

VCC Zener Voltage

ICC = 25 mA

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