L5991 datasheet(3/19 Pages) STMICROELECTRONICS

Part #	L5991

Description	PRIMARY CONTROLLER WITH STANDBY

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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ELECTRICAL CHARACTERISTICS (VCC = 15V; Tj = 0 to 105

°C; RT = 13.3kΩ (*) CT = 1nF;

unless otherwise specified.)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

REFERENCE SECTION

VREF

Output Voltage

Tj =25

°C; IO = 1mA

4.925

5.0

5.075

V

Line Regulation

VCC = 12 to 20V; Tj =25

°C

2.0

10

mV

Load Regulation

IO = 1 to 10mA; Tj =25

°C

2.0

10

mV

TS

Temperature Stability

0.4

mV/

°C

Total Variation

Line, Load, Temperature

4.80

5.0

5.130

V

IOS

Short Circuit Current

Vref = 0V

30

150

mA

Power Down/UVLO

VCC = 6V; Isink = 0.5mA

0.2

0.5

V

OSCILLATOR SECTION

Initial Accuracy

pin 15 = Vref;

Tj =25

°C

Vcomp = 4.5V

95

100

105

kHz

pin 15 = Vref; VCC = 12 to 20V

Vcomp = 4.5V

93

100

107

kHz

pin 15 = Vref; VCC = 12 to 20V

Vcomp =2V

46.5

50

53.5

kHz

Duty Cycle

pin 3 = 0,7V, pin 15 = VREF

pin 3 = 0.7V, pin 15 = OPEN

0

%

pin 3 = 3.2V, pin 15 = VREF

pin 3 = 3.2V, pin 15 = OPEN

47

93

%

Duty Cycle Accuracy

pin 3 = 2.79V, pin 15 = OPEN

75

80

85

%

Oscillator Ramp Peak

2.8

3.0

3.2

V

Oscillator Ramp Valley

0.75

0.9

1.05

V

ERROR AMPLIFIER SECTION

Input Bias Current

VFB to GND

0.2

3.0

µA

VI

Input Voltage

VCOMP =VFB

2.42

2.5

2.58

V

GOPL

Open Loop Gain

VCOMP = 2 to 4V

60

90

dB

SVR

Supply Voltage Rejection

VCC = 12 to 20V

85

dB

VOL

Output Low Voltage

Isink = 2mA

1.1

V

VOH

Output High Voltage

Isource = 0.5mA, VFB = 2.3V

5

6

V

IO

Output Source Current

VCOMP > 4V, VFB = 2.3V

0.5

1.3

2.5

mA

Output Sink Current

VCOMP = 1.1V, VFB = 2.7V

2

6

mA

Unit Gain Bandwidth

1.7

4

MHz

SR

Slew Rate

8

V/

µs

PWM CURRENT SENSE SECTION

Ib

Input Bias Current

Isen =0

3

15

µA

IS

Maximum Input Signal

VCOMP = 5V

0.92

1.0

1.08

V

Delay to Output

70

100

ns

Gain

2.85

3

3.15

V/V

Vt

Fault Threshold Voltage

1.1

1.2

1.3

V

SOFT START SECTION

ISSC

SS Charge Current

Tj =25

°C

142026

µA

ISSD

SS Discharge Current

VSS = 0.6V Tj =25

°C

5

10

15

µA

VSSSAT

SS Saturation Voltage

DC = 0%

0.6

V

VSSCLAMP

SS Clamp Voltage

7

V

LEADING EDGE BLANKING

Internal Masking Time

100

ns

OUTPUT SECTION

VOL

Output Low Voltage

IO = 250mA

1.0

V

VOH

Output High Voltage

IO = 20mA; VCC = 12V

10

10.5

V

IO = 200mA; VCC = 12V

9

10

V

VOUT CLAMP

Output Clamp Voltage

IO = 5mA; VCC = 20V

13

V

Collector Leakage

VCC = 20V VC = 24V

2

20

µA

(*) RT =RA//RB,RA =RB = 27k

Ω, see Fig. 22.

L5991 - L5991A

3/23

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