AS2845D-8 datasheet(4/20 Pages) ETC

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AS2842/3/4/5

Current Mode Controller

ASTEC Semiconductor

Electrical Characteristics

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, 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

5 V Regulator

Output Voltage

VREG

TJ = 25

° C, IREG = 1 mA

4.95

5.00

5.05

Line Regulation

PSRR

≤ VCC ≤ 25 V

Load Regulation

≤ IREG ≤ 20 mA

Temperature Stability1

TCREG

0.2

0.4

mV/

°C

Total Output Variation

Line, load, temperature

4.85

5.15

Long-term Stability

Over 1,000 hrs at 25

° C5

Output Noise Voltage

VNOISE

10 Hz

≤ f ≤ 100 kHz, TJ = 25° C50

µV

Short Circuit Current

ISC

100

180

2.5 V Internal Reference

Nominal Voltage

VFB

T = 25

° C; IREG = 1 mA

2.475

2.500

2.525

Line Regulation

PSRR

12 V

≤ VCC ≤ 25 V

Load Regulation

≤ IREG ≤ 20 mA

Temperature Stability

TCVFB

0.1

0.2

mV/

°C

Total Output Variation1

Line, load, temperature

2.450

2.500

2.550

Long-term Stability

Over 1,000 hrs at 125

° C

Oscillator

Initial Accuracy

fOSC

TJ = 25

° C

475257

kHz

Voltage Stability

12 V

≤ VCC ≤ 25 V

0.2

Temperature Stability

TCf

TMIN

≤ TJ≤ TMAX

Amplitude

fOSC

VRT/CT peak-to-peak

1.6

Upper Trip Point

2.9

Lower Trip Point

1.3

Sync Threshold

VSYNC

400

600

800

Discharge Current

7.5

8.7

9.5

Duty Cycle Limit

RT = 680

Ω, CT = 5.3 nF, TJ = 25° C

465052

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