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MC44605
(Rev.:2000)

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

ON Semiconductor 

MC44605

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

values TA = –25° to +85°C unless otherwise noted.) (Note 1.)

Characteristic

Pin #

Symbol

Min

Typ

Max

Unit

ERROR AMPLIFIER SECTION

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

Input Bias Current (VFB = 2.5 V)

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

Unity Gain Bandwidth

TJ = 25°C

TA = –25° to +85°C

14

VFB

2.4

2.5

2.6

V

14

IFB–ib

–2.0

–0.6

–

µA

AVOL

65

70

–

dB

BW

MHz

–

–

–

–

–

5.5

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

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

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)

CURRENT SENSE SECTION

Maximum Current Sense Input Threshold

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

Input Bias Current

Propagation Delay (Current Sense Input to Output at VTH of

MOS transistor = 3.0 V)

VFBline–reg

–10

–

10

mV

13

mA

ISink

2.0

12

–

ISource

–2.0

–

–0.2

13

V

VOH

VOL

5.5

6.5

7.5

–

1.0

1.1

7

Vcs–th

0.96

1.0

1.04

V

7

Ics–ib

–10

–2.0

–

µA

tPLH(In/Out)

–

120

200

ns

OSCILLATOR AND SYNCHRONIZATION SECTION

Frequency (TA = –25° to +85°C)

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

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

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

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

Synchronization Input Threshold Voltage

Negative Clamp Level (Isyncth–in = 2.0 mA)

UNDERVOLTAGE LOCKOUT SECTION

FOSC

16

–

20

kHz

∆FOSC/∆V

–

0.05

–

%/V

∆FOSC/∆T

–

0.05

–

%/°C

Icharge/Iref

0.39

–

0.48

–

D

72

75

78

%

9

Vsyncth

–250

–200

–150

mV

NEG–SYNC –0.65

–0.5

–0.34

V

Start–up Threshold

1

Vstup–th

13.6

14.5

15.4

V

Disable Voltage After Threshold Turn–On (UVLO 1)

(TA = –25° to +85°C)

1

Vdisable1

8.3

–

9.6

V

Disable Voltage After Threshold Turn–On (UVLO 2)

(TA = –25° to +85°C)

1

Vdisable2

7.0

7.5

8.0

V

1. Adjust VCC above the start–up 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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