MC44602

4

MOTOROLA ANALOG IC DEVICE DATA

values TA = –25°C to +85°C [Note 3] unless otherwise noted.)

Characteristic

Symbol

Min

Typ

Max

Unit

OUTPUT SECTION

Output Voltage (TA = 25°C)

Low State

(ISink = 100 mA)

Low State

(ISink = 1.0A)

Low State

(ISink = 1.5 A)

High State (ISource = 50 mA)

VOL

(VCC–VOH)

–

–

–

–

–

–

0.6

1.8

2.1

1.4

1.7

1.8

0.3

2.0

2.6

1.7

2.0

2.2

V

Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA)

VOL(UVLO)

–

0.1

1.1

V

Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)

tr

–

50

150

ns

Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)

tf

–

50

150

ns

PWM SECTION

Duty Cycle

Maximum

Minimum

DC(max)

DC(min)

46

–

48

–

50

0

%

TOTAL DEVICE

Power Supply Current

Startup (VCC = 5 V)

Operating (Note 2)

TJ = 25° C

TA = –25°C to +85° C

ICC

–

–

10

0.2

17

–

0.5

20

22

mA

Power Supply Zener Voltage (ICC = 25 mA)

VZ

18

20

23

V

OVERLOAD AND SHORT CIRCUIT PROTECTION

Foldback Amplifier Threshold (Figures 9,10)

∆VFB

(VFB–100) (VFB–200) (VFB–300)

mV

Load Detect Input

Valid Load Comparator Threshold (VPin 2 Increasing)

Demag Comparator Threshold (VPin 2 Decreasing)

Propagation Delay (Input to Sink or Source Output)

Input Resistance

Vth(VL)

Vth(Demag)

tPLH(in/out)

Rin

2.0

50

–

12

2.5

88

1.1

18

3.0

120

1.6

30

V

mV

µS

k

Ω

NOTES: 2. Adjust VCC above the startup threshold before setting to 12V.

3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

Figure 1. Timing Resistor

versus Oscillator Frequency

0.8

2.0

5.0

8.0

20

50

80

1.0 M

500 k

200 k

100 k

50 k

20 k

10 k

fOSC, OSCILLATOR FREQUENCY (Hz)

CT=100 pF

CT=500 pF

Figure 2. Output Deadtime

versus Oscillator Frequency

1.0 M

100 k

10 k

fOSC, OSCILLATOR FREQUENCY (Hz)

50

1

2

3

4

5

55

60

65

70

75

6

30

10

3.0

1.0

20 k

50 k

200 k

500 k

Note: Output switches at

one–half the oscillator

frequency.

VCC = 12 V

TA = 25°C

CT=10 nF

CT=1.0 nF

CT=200 pF

CT=2.0 nF

VCC = 12 V

TA = 25°C

Note: Output switches at

one–half the oscillator frequency.

CT=5.0 nF

1. CT = 10 nF

2. CT = 5.0 nF

3. CT = 2.0 nF

4. CT = 1.0 nF

5. CT = 500 pF

6. CT = 100 pF