UC3845BDR2G datasheet(3/19 Pages) ONSEMI

Part #	UC3845BDR2G

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 7], 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 8], unless otherwise noted.)

UC284xB

UC384xB, xBV,

NCV384xBV

Characteristic

Symbol

Min

Typ

Max

Min

Typ

Max

Unit

OSCILLATOR SECTION

Discharge Current (VOSC = 2.0 V)

TJ = 25°C

TA = Tlow to Thigh (UC284XB, UC384XB)

(UC384XBV)

Idischg

7.8

7.5

−

8.3

−

8.8

−

7.8

7.6

7.2

8.3

−

8.8

mA

ERROR AMPLIFIER SECTION

Voltage Feedback Input (VO = 2.5 V)

VFB

2.45

2.5

2.55

2.42

2.5

2.58

V

Input Bias Current (VFB = 5.0 V)

IIB

−

− 0.1

−1.0

−

− 0.1

− 2.0

mA

Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)

AVOL

65

90

−

65

90

−

dB

Unity Gain Bandwidth (TJ = 25°C)

BW

0.7

1.0

−

0.7

1.0

−

MHz

Power Supply Rejection Ratio (VCC = 12 V to 25 V)

PSRR

60

70

−

60

70

−

dB

Output Current − Sink (VO = 1.1 V, VFB = 2.7 V)

Output Current − Source (VO = 5.0 V, VFB = 2.3 V)

ISink

ISource

2.0

− 0.5

12

−1.0

−

2.0

− 0.5

12

−1.0

−

mA

Output Voltage Swing

High State (RL = 15 k to ground, VFB = 2.3 V)

Low State (RL = 15 k to Vref, VFB = 2.7 V)

(UC284XB, UC384XB)

(UC384XBV)

VOH

VOL

5.0

−

6.2

0.8

−

1.1

−

5.0

−

6.2

0.8

−

1.1

1.2

V

CURRENT SENSE SECTION

Current Sense Input Voltage Gain (Notes 9 & 10)

(UC284XB, UC384XB)

(UC384XBV)

AV

2.85

−

3.0

−

3.15

−

2.85

3.0

3.15

3.25

V/V

Maximum Current Sense Input Threshold (Note 9)

(UC284XB, UC384XB)

(UC384XBV)

Vth

0.9

−

1.0

−

1.1

−

0.9

0.85

1.0

1.1

V

Power Supply Rejection Ratio (VCC = 12 V to 25 V) (Note 9)

PSRR

−

70

−

70

−

dB

Input Bias Current

IIB

−

− 2.0

−10

−

− 2.0

−10

mA

Propagation Delay (Current Sense Input to Output)

tPLH(In/Out)

−

150

300

−

150

300

ns

OUTPUT SECTION

Output Voltage

Low State (ISink = 20 mA)

(ISink = 200 mA, UC284XB, UC384XB)

(ISink = 200 mA, UC384XBV)

High State (ISource = 20 mA, UC284XB, UC384XB)

(ISource = 20 mA, UC384XBV)

(ISource = 200 mA)

VOL

VOH

−

13

−

12

0.1

1.6

−

13.5

−

13.4

0.4

2.2

−

13

12.9

12

0.1

1.6

13.5

−

13.4

0.4

2.2

2.3

−

V

Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA) VOL(UVLO)

−

0.1

1.1

−

0.1

1.1

V

Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)

tr

−

50

150

−

50

150

ns

Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)

tf

−

50

150

−

50

150

ns

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold

UCX844B, BV

UCX845B, BV

Vth

15

7.8

16

8.4

17

9.0

14.5

7.8

16

8.4

17.5

9.0

V

Minimum Operating Voltage After Turn−On

UCX844B, BV

UCX845B, BV

VCC(min)

9.0

7.0

10

7.6

11

8.2

8.5

7.0

10

7.6

11.5

8.2

V

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

8. 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

9. This parameter is measured at the latch trip point with VFB = 0 V.

10.Comparator gain is defined as: AV = DV Output/Compensation

DV Current Sense Input

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