UC3844BDG datasheet(4/19 Pages) ONSEMI

Part #	UC3844BDG

Description	High Performance Current Mode Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

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UC3844B, UC3845B, UC2844B, UC2845B

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ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 11], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max

values TA is the operating ambient temperature range that applies [Note 12], unless otherwise noted.)

UC284xB

UC384xB, xBV, NCV384xBV

Characteristic

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

PWM SECTION

Duty Cycle

Maximum (UC284XB, UC384XB)

Maximum (UC384XBV)

Minimum

DC(max)

DC(min)

47

−

48

−

50

−

0

47

46

−

48

−

50

0

%

TOTAL DEVICE

Power Supply Current

Startup (VCC = 6.5 V for UCX845B,

Startup (VCC = 14 V for UCX844B, BV)

Operating (Note 11)

ICC

−

0.3

12

0.5

17

−

0.3

12

0.5

17

mA

Power Supply Zener Voltage (ICC = 25 mA)

VZ

30

36

−

30

36

−

V

11. Adjust VCC above the Startup threshold before setting to 15 V.

12.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

Tlow =0°C for UC3844B, UC3845B

Thigh =+ 70°C for UC3844B, UC3845B

= − 25°C for UC2844B, UC2845B

= + 85°C for UC2844B, UC2845B

= − 40°C for UC384xBV, NCV384xBV

= +105°C for UC3844BV, UC3845BV

=+125°C for NCV384xBV

0.8

2.0

5.0

8.0

20

50

80

1.0 M

500 k

200 k

100 k

50 k

20 k

10 k

fOSC, OSCILLATOR FREQUENCY (kHz)

Figure 2. Timing Resistor

versus Oscillator Frequency

Figure 3. Output Deadtime

versus Oscillator Frequency

1.0 M

100 k

10 k

fOSC, OSCILLATOR FREQUENCY (kHz)

50

1.CT = 10 nF

2.CT = 5.0 nF

3.CT = 2.0 nF

4.CT = 1.0 nF

5.CT = 500 pF

6.CT = 200 pF

7.CT = 100 pF

55

60

65

70

75

20 k

50 k

200 k

500 k

2

3

7

5

6

NOTE: Output switches at

1/2 the oscillator frequency

VCC = 15 V

TA = 25°C

0.5

ms/DIV

2.55 V

2.5 V

2.45 V

VCC = 15 V

AV = -1.0

TA = 25°C

VCC = 15 V

AV = -1.0

TA = 25°C

1.0

ms/DIV

2.5 V

3.0 V

2.0 V

Figure 4. Error Amp Small Signal

Transient Response

Figure 5. Error Amp Large Signal

Transient Response

1

4

For RT u 5Kf X 1.72

RTCT

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