UC2844BVDR2G View Datasheet(PDF) - ON Semiconductor

Part Name

Description

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UC2844BVDR2G

High Performance Current Mode Controllers

ON Semiconductor 

UC3844B, UC3845B, UC2844B, UC2845B

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1)

Total Power Supply and Zener Current

Output Current, Source or Sink (Note 2)

Output Energy (Capacitive Load per Cycle)

VCC, VC

(ICC + IZ)

IO

W

36

V

30

mA

1.0

A

5.0

mJ

Current Sense and Voltage Feedback Inputs

Error Amp Output Sink Current

Power Dissipation and Thermal Characteristics

D Suffix, Plastic Package, SOIC−14 Case 751A

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction−to−Air

D1 Suffix, Plastic Package, SOIC−8 Case 751

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction−to−Air

N Suffix, Plastic Package, Case 626

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction−to−Air

Operating Junction Temperature

Operating Ambient Temperature

UC3844B, UC3845B

UC2844B, UC2845B

UC3844BV, UC3845BV

Vin

IO

PD

RqJA

PD

RqJA

PD

RqJA

TJ

TA

− 0.3 to + 5.5

V

10

mA

862

145

702

178

1.25

100

+150

0 to +70

−25 to +85

−40 to +105

mW

°C/W

mW

°C/W

W

°C/W

°C

°C

Storage Temperature Range

Tstg

− 65 to +150

°C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. The voltage is clamped by a zener diode (see page 9 Under Voltage Lockout section). Therefore this voltage may be exceeded as long as

the total power supply and zener current is not exceeded.

2. Maximum package power dissipation limits must be observed.

3. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JEDEC Standard

JESD22-A114B, Machine Model Method 200 V per JEDEC Standard JESD22-A115-A

4. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78

ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 5], 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 6], unless otherwise noted.)

UC284xB

UC384xB, xBV, NCV384xBV

Characteristic

Symbol Min Typ Max Min

Typ

Max Unit

REFERENCE SECTION

Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)

Vref

4.95 5.0 5.05

4.9

5.0

5.1

Line Regulation (VCC = 12 V to 25 V)

Regline

−

2.0

20

−

2.0

20

Load Regulation (IO = 1.0 mA to 20 mA)

Regload

−

3.0

25

−

3.0

25

Temperature Stability

TS

−

0.2

−

−

0.2

−

Total Output Variation over Line, Load, & Temperature

Vref

4.9

−

5.1

4.82

−

5.18

Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)

Vn

−

50

−

−

50

−

Long Term Stability (TA = 125°C for 1000 Hours)

S

−

5.0

−

−

5.0

−

Output Short Circuit Current

ISC

− 30 − 85 −180 − 30

− 85

−180

OSCILLATOR SECTION

Frequency

TJ = 25°C

TA = Tlow to Thigh

TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)

fOSC

49

52

55

49

52

55

48

−

56

48

−

56

225 250 275

225

250

275

Frequency Change with Voltage (VCC = 12 V to 25 V) DfOSC/DV −

0.2 1.0

−

0.2

1.0

Frequency Change w/ Temperature (TA = Tlow to Thigh) DfOSC/DT −

1.0

−

−

0.5

−

Oscillator Voltage Swing (Peak−to−Peak)

VOSC

−

1.6

−

−

1.6

−

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

6. 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

= − 25°C for UC2844B, UC2845B

Thigh = + 70°C for UC3844B, UC3845B

= + 85°C for UC2844B, UC2845B

= − 40°C for UC384xBV, NCV384xBV

=+105°C for UC3844BV, UC3845BV

= +125°C for NCV384xBV

V

mV

mV

mV/°C

V

mV

mV

mA

kHz

%

%

V

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