PJ494

Switchmode Pulse Width Modulation Control Circuit

3-11

2002/11.rev.A

DEAD-TIME CONTROL SECTIONDead-time control-section (See Figure 11)

Value

Parameter

Test Conditions

Min

Typ*

Max

Unit

Input bias current (pin 4)

--

-2.0

-10

µA

Maximum duty cycle, each output

--

45

50

%

Zero duty cycle

--

3.0

3.3

Input threshold voltage(pin 4)

Maximum duty cycle

0

--

--

V

PWM COMPARATOR SECTION (See Figure11)

Value

Parameter

Test Conditions

Min

Typ*

Max

Unit

Input threshold voltage (pin 3)

Zero duty cycle

--

4.0

4.5

V

Input sink current (pin 3)

V(pin 3)=0.7V

0.3

0.7

--

mA

TOTAL DEVICE

Value

Parameter

Test Conditions

Min

Typ*

Max

Unit

Vcc=15V

--

6.0

10

Standby supply current

Pin 6 at Vref, all other inputs and

outputs open

Vcc=40V

--

9.0

15

Average supply current

--

7.5

--

mA

Value

Parameter

Test Conditions

Min

Typ*

Max

Unit

Output voltage rise time

--

100

200

Output voltage fall time

Common-emitter configuration,

See Figure 3

--

25

100

Output voltage rise time

--

100

200

Output voltage fall time

Emitter-follower configuration,

See Figure 4

--

40

100

ns

UNDERVOLTAGE LOCKOUT SECTION

Value

Parameter

Test Conditions

Min

Typ*

Max

Unit

Turn-on Threshold

Vcc increasing Iref =1.0mA

5.5

6.43

7.0

V

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

Duration of the short-circuit should not exceed one second

Standard deviation is a measure of the statistical distribution about the mean as derived from the formula

2

1

1

2

1

)

(

















−

−

=

∑

=

N

n

n

N

x

x

σ

Temperature coefficient of timing capacitor and timing resistor not taken into account