UC2843 datasheet(4/8 Pages) TI | Current Mode PWM Controller

4 page

PARAMETER

TEST CONDITION

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Output Section

Output Low Level

ISINK = 20mA

0.1

0.4

0.1

0.4

ISINK = 200mA

1.5

2.2

1.5

2.2

Output High Level

ISOURCE = 20mA

13.5

ISOURCE = 200mA

13.5

Rise Time

TJ = 25°C, CL = 1nF (Note 2)

150

Fall Time

TJ = 25°C, CL = 1nF (Note 2)

150

Under-voltage Lockout Section

Start Threshold

X842/4

14.5

17.5

X843/5

7.8

8.4

9.0

7.8

8.4

9.0

Min. Operating Voltage

After Turn On

X842/4

8.5

11.5

X843/5

7.0

7.6

8.2

7.0

7.6

8.2

PWM Section

Maximum Duty Cycle

X842/3

100

X844/5

Minimum Duty Cycle

Total Standby Current

Start-Up Current

0.5

Operating Supply Current

VPIN 2 = VPIN 3 = 0V

VCC Zener Voltage

ICC = 25mA

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

Note 3: Parameter measured at trip point of latch with VPIN 2 = 0.

Note 4: Gain defined as:

∆ VPIN 1

∆ VPIN 3

; 0

≤ VPIN 3 ≤ 0.8V.

Note 5: Adjust VCC above the start threshold before setting at 15V.

Note 6: Output frequency equals oscillator frequency for the UC1842 and UC1843.

Output frequency is one half oscillator frequency for the UC1844 and UC1845.

UC1842/3/4/5

UC2842/3/4/5

UC3842/3/4/5

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for −55°C ≤ TA ≤ 125°C for the

UC184X;

−40°C≤ TA ≤ 85°C for the UC284X; 0°C ≤ TA ≤ 70°C for the 384X; VCC =

15V (Note 5); RT = 10k; CT =3.3nF, TA=TJ.

ERROR AMP CONFIGURATION

Error Amp can Source or Sink up to 0.5mA

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