MC44605_06 datasheet(4/20 Pages) ONSEMI | High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications

4 page

MC44605

http://onsemi.com

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 4)

Characteristic

Pin #

Symbol

Min

Typ

Max

Unit

ERROR AMPLIFIER SECTION

Voltage Feedback Input (VE/A out = 2.5 V)

VFB

2.4

2.5

2.6

Input Bias Current (VFB = 2.5 V)

IFB−ib

−2.0

−0.6

−

Open Loop Voltage Gain (VE/A out = 2.0 V to 4.0 V)

AVOL

−

Unity Gain Bandwidth

TJ = 25°C

TA = −25° to +85°C

−

5.5

MHz

Voltage Feedback Input Line Regulation (VCC = 10 V to 15 V)

VFBline−reg

−10

−

Output Current

Sink (VE/A out = 1.5 V, VFB = 2.7 V)

TA = −25° to +85°C

Source (VE/A out = 5.0 V, VFB = 2.3 V)

TA = −25° to +85°C

ISink

ISource

2.0

−2.0

−

−0.2

Output Voltage Swing

High State (IE/A out (source) = 0.5 mA, VFB = 2.3 V)

Low State (IE/A out (sink) = 0.33 mA, VFB = 2.7 V)

VOH

VOL

5.5

−

6.5

1.0

7.5

1.1

CURRENT SENSE SECTION

Maximum Current Sense Input Threshold

(VFeedback (pin14) = 2.3 V and VSoft−Start (pin11) = 1.2 V)

Vcs−th

0.96

1.0

1.04

Input Bias Current

Ics−ib

−10

−2.0

−

Propagation Delay (Current Sense Input to Output at VTH of MOS

transistor = 3.0 V)

tPLH(In/Out)

−

120

200

OSCILLATOR AND SYNCHRONIZATION SECTION

Frequency (TA = −25° to +85°C)

FOSC

−

kHz

Frequency Change with Voltage (VCC = 10 V to 15 V)

DFOSC/DV

−

0.05

−

%/V

Frequency Change with Temperature (TA = −25° to +85°C)

DFOSC/DT

−

0.05

−

°C

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

Icharge/Iref

0.39

−

0.48

−

Free Mode Oscillator Ratio = Idischarge/(Idischarge + Icharge)

Synchronization Input Threshold Voltage

Vsyncth

−250

−200

−150

Negative Clamp Level (Isyncth−in = 2.0 mA)

NEG−SYNC

−0.65

−0.5

−0.34

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold

Vstup−th

13.6

14.5

15.4

Disable Voltage After Threshold Turn−On (UVLO 1)

(TA = −25° to +85°C)

Vdisable1

8.3

−

9.6

Disable Voltage After Threshold Turn−On (UVLO 2)

(TA = −25° to +85°C)

Vdisable2

7.0

7.5

8.0

4. 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.

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