STR-X6759N datasheet(6/11 Pages) ALLEGRO

Part #	STR-X6759N

Description	Off-Line Quasi-Resonant Switching Regulators

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Off-Line Quasi-Resonant Switching Regulators

STR-X6759N

6

ELECTRICAL CHARACTERISTICS

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

ELECTRICAL CHARACTERISTICS for Controller (MIC)1

, valid at TA = 25°C, VCC = 20 V, unless otherwise specified

Power Supply Start-up Operation

Operation Start Voltage

VCC(ON)

VCC = 0→20 V

16.3

18.2

19.9

V

Operation Stop Voltage

VCC(OFF)

VCC = 20→8.8 V

8.8

9.7

10.6

V

Circuit Current In Operation

ICC(ON)

––6

mA

Circuit Current In Non-Operation

ICC(OFF)

VCC = 15 V

–

100

μA

Oscillation Frequency

fosc

19

22

25

kHz

Soft Start Operation Stop Voltage

VSSOLP(SS) VSS/OLP increasing

1.1

1.2

1.4

V

Soft Start Operation Charging Current

ISSOLP(SS) VSS/OLP = 0 V

–710

–550

–390

μA

Normal Operation

Bottom-Skip Operation Threshold Voltage 1

VOCPBD(BS1)

–0.720

–0.665

–0.605

V

Bottom-Skip Operation Threshold Voltage 2

VOCPBD(BS2)

–0.485

–0.435

–0.385

V

Overcurrent Detection Threshold Voltage

VOCPBD(LIM) VOCP/BD falling

–0.995

–0.940

–0.895

V

OCP/BD Terminal Outflow Current

IOCPBD

VOCP/BD = –0.95 V

–250

–100

–40

μA

Quasi-Resonant Operation Threshold Voltage 1

VOCPBD(TH1) VOCP/BD falling

0.28

0.40

0.52

V

Quasi-Resonant Operation Threshold Voltage 2

VOCPBD(TH2) VOCP/BD rising

0.67

0.80

0.93

V

FB Terminal Threshold Voltage

VFB(OFF)

VFB rising

1.32

1.45

1.58

V

FB Terminal Inflow Current (Normal Operation)

IFB(ON)

VFB = 1.6 V

600

1000

1400

μA

Standby Operation

Standby Operation Start Voltage

VCC(S)

VCC = 0→15 V, VFB = 1.6 V

10.3

11.2

12.1

V

Standby Operation Start Voltage Interval

VCC(SK)

VCC(SK) = VCC(S) – VCC(OFF)

1.10

1.35

1.65

V

Standby Non-Operation Circuit Current

ICC(S)

VCC = 10.2 V, VFB = 1.6 V

–20

56

μA

FB Terminal Inflow Current, Standby Operation

IFB(S)

VCC = 10.2 V, VFB = 1.6 V

–4

14

μA

FB Terminal Threshold Voltage, Standby Operation

VFB(S)

VCC = 15 V, VFB rising

0.55

1.10

1.50

V

Minimum On Time

tON(MIN)

0.65

1.05

1.45

μs

Protection Operation

Maximum On Time

tON(MAX)

27.5

32.5

39.0

μs

Overload Protection Operation Threshold Voltage

VSSOLP(OLP)

4.0

4.9

5.8

V

Overload Protection Operation Charging Current

ISSOLP(OLP) VSS/OLP = 2.5 V

–16

–11

–6

μA

Overvoltage Protection Operation Voltage

VCC(OVP)

VCC = 0→30 V

25.5

27.7

29.9

V

Latch Circuit Holding Current2

ICC(H)

VCC(OFF)– 0.3 V

–

45

140

μA

Latch Circuit Release Voltage2

VCC(La.OFF) VCC = 30→6 V, OVP operating

6.0

7.2

8.5

V

ELECTRICAL CHARACTERISTICS for MOSFET

, valid at TA = 25°C, unless otherwise specified

Drain-to-Source Breakdown Voltage

VDSS

IDSS = 300 μA

650

–

V

Drain Leakage Current

IDSS

VDSSS = 650 V

–

300

μA

On Resistance

RDS(on)

IDS = 3.5 A

–

0.385

Ω

Switching Time

tf

–

600

ns

Thermal Resistance

Rθch-F

Channel to internal frame

–

0.99

°C/W

1

Current polarity with respect to the IC: positive current indicates current sink at the terminal named, negative current indicates source at the

terminal named.

2

The latch circuit means a circuit operated OVP and OLP.

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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