UC3845BD1R2 datasheet(3/20 Pages) ONSEMI

Part #	UC3845BD1R2

Description	HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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Manufacturer	ONSEMI [ON Semiconductor]

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UC3844B, UC3845B, UC2844B, UC2845B

http://onsemi.com

3

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Total Power Supply and Zener Current

(ICC + IZ)

30

mA

Output Current, Source or Sink (Note 1)

IO

1.0

A

Output Energy (Capacitive Load per Cycle)

W

5.0

mJ

Current Sense and Voltage Feedback Inputs

Vin

− 0.3 to + 5.5

V

Error Amp Output Sink Current

IO

10

mA

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

PD

RqJA

PD

RqJA

PD

RqJA

862

145

702

178

1.25

100

mW

°C/W

mW

°C/W

W

°C/W

Operating Junction Temperature

TJ

+150

°C

Operating Ambient Temperature

UC3844B, UC3845B

UC2844B, UC2845B

TA

0 to + 70

− 25 to + 85

°C

Storage Temperature Range

Tstg

− 65 to +150

°C

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit

values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,

damage may occur and reliability may be affected.

1. Maximum package power dissipation limits must be observed.

ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 2], 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 3], unless otherwise noted.)

UC284XB

UC384XB, XBV

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

V

Line Regulation (VCC = 12 V to 25 V)

Regline

−

2.0

20

−

2.0

20

mV

Load Regulation (IO = 1.0 mA to 20 mA)

Regload

−

3.0

25

−

3.0

25

mV

Temperature Stability

TS

−

0.2

−

0.2

−

mV/

°C

Total Output Variation over Line, Load, and Temperature

Vref

4.9

−

5.1

4.82

−

5.18

V

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

Vn

−

50

−

50

−

mV

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

S

−

5.0

−

5.0

−

mV

Output Short Circuit Current

ISC

−30

−85

−180

−30

−85

−180

mA

OSCILLATOR SECTION

Frequency

TJ = 25°C

TA = Tlow to Thigh

TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)

fOSC

49

48

225

52

−

250

55

56

275

49

48

225

52

−

250

55

56

275

kHz

Frequency Change with Voltage (VCC = 12 V to 25 V)

DfOSC/DV

−

0.2

1.0

−

0.2

1.0

%

Frequency Change with Temperature (TA = Tlow to Thigh)

DfOSC/DT

−

1.0

−

0.5

−

%

Oscillator Voltage Swing (Peak−to−Peak)

VOSC

−

1.6

−

1.6

−

V

Discharge Current (VOSC = 2.0 V)

TJ = 25°C

TA = Tlow to Thigh (UC284XB, UC384XB)

TA = Tlow to Thigh (UC384XBV)

Idischg

7.8

7.5

−

8.3

−

8.8

−

7.8

7.6

7.2

8.3

−

8.8

mA

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

3. 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 UC3844BV, UC3845BV

= +105

°C for UC3844BV, UC3845BV

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