MC44605_06 datasheet(5/20 Pages) ONSEMI

No de pièce	MC44605

Description	High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications

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MC44605

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ELECTRICAL CHARACTERISTICS (VCC and VC = 12 V, Rref = 10 kW, CT = 2.2 nF, for typical values TA = 25°C, for

min/max values TA = −25° to +85°C unless otherwise noted.) (Note 5)

Characteristic

Pin #

Symbol

Min

Typ

Max

Unit

REFERENCE SECTION

Reference Output Voltage (VCC = 10 V to 15 V)

16

Vref

2.4

2.5

2.6

V

Reference Current Range (Iref = Vref/Rref, R = 5.0 k to 25 kW)

16

Iref

−500

−

−100

mA

Reference Voltage Over Iref Range

DVref

−40

−

40

mV

DEMAGNETIZATION DETECTION SECTION (Note 6)

Demagnetization Detect Input

Demagnetization Comparator Threshold (Vpin9 Decreasing)

Propagation Delay (Input to Output, Low to High)

Input Bias Current (Vdemag = 65 mV)

8

Vdemag−th

tPLH(In/Out)

Idemag−lb

50

−

−0.5

65

0.5

−

80

−

mV

ms

mA

Minimum Off−Time when the pin 8 is grounded

TDEM−GND

1.5

3.0

4.5

ms

Negative Clamp Level (Idemag = −2.0 mA)

CLVL−neg

−0.50

−0.38

−0.25

V

Positive Clamp Level (Idemag = +2.0 mA)

CLVL−pos

0.50

0.72

0.85

V

SOFT−START SECTION (Note 7)

Ratio Charge Current/Iref (TA = −25° to +85°C)

Iss−ch/Iref

0.37

−

0.43

−

Discharge Current (Vsoft−start = 1.0 V)

Idischarge

1.5

5.0

−

mA

Clamp Level

VSS−CLVL

2.2

2.4

2.6

V

Circuit Inhibition Threshold (Note 8)

VSSinhi

30

−

150

mV

VCS Soft−Start Clamp Level (Rsoft−start = 5 kW)

VCSsoft−start

0.45

0.5

0.55

V

OVERVOLTAGE SECTION

Propagation Delay (VCC > 18.1 V to Vout Low)

TPHL(In/Out)

1.0

−

4.0

ms

Protection Level on VCC (TA = −25° to +85°C)

VCC prot

15.9

−

18.1

V

EHT OVP SECTION (Note 9)

Negative Clamp Level (Isynch−in = −2.0 mA)

NEG−SYN

C

−0.65

−0.5

−0.35

V

EHT OVP Input Threshold

Vref

7.0

7.4

7.8

V

EHT OVP Input Bias Current (VEHT OVP(pin 9) = 0 V)

9

IEHTOVP

−5.0

−

0

mA

WINDING SHORT CIRCUIT DETECTION SECTION

WSCD Threshold with Ipin15 = 200 mA

Vshift

70

100

120

mV

MPL & OHD SECTION

MPL Parameter (Note 10)

ΓMPL

0.185

0.240

0.295

V−1

MPL Comparator Threshold (Note 11)

VMPL−th

2.4

2.5

2.6

V

OHD Parameter (Note 12)

ΓOHD

1.15

1.50

1.85

V−1

OHD Comparator Threshold (Note 13)

VOHD−th

2.4

2.5

2.6

V

5. Adjust VCC above the startup threshold before setting to 12 V. Low duty cycle pulse techniques are used during test to maintain junction

temperature as close to ambient as possible.

6. This function can be inhibited by connecting pin 8 to GND. In this case, there is a minimum off−time equal to TDEM−GND.

7. The MC44605 can be shut down by connecting soft−start pin (pin 11) to GND.

8. The circuit is shutdown if the soft−start pin voltage is lower than this level.

9. This function can be inhibited by connecting pin 9 to GND. In this case, the synchronization block is inhibited too and the MC44605 works

in free mode.

10. This parameter is defined in the MPL §. This parameter is obtained by measuring the MPL pin average current and dividing this result by the

corresponding squared VCS, the measured frequency value and the CT value deducted from the measured frequency value.

Measurement conditions: VFeedback(pin 14) = 2.3 V, Vsoft−start(pin 11) = 0.5 V and pins 7, 8, and 9 connected to GND (the working frequency

is typically equal to 18 kHz − Rref = 10 kW "1%, CT = 2.2 nF).

11. The MPL comparator output is DisMPL.

12. This parameter is defined in the OHD §. This parameter is obtained by measuring the OHD pin average current and dividing this result by

the corresponding squared VCS value and multiplying it by the Rref value.

Measurement conditions: VFeedback(pin 14) = 2.3 V, Vsoft−start(pin 11) = 0.5 V and pins 7, 8, and 9 connected to GND (the working frequency

is typically equal to 18 kHz − Rref = 10 kW "1%, CT = 2.2 nF).

13. The OHD comparator output is DisOHD.

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