TN0024

HOLD-UP graph: Tup = 10 ms

7/11

Equation 27

The minimum DC input voltage that the power supply will run:

Equation 28

Figure 2.

P-Spice schematic

Figure 3.

P-Spice simulation - voltage, current vs. time

V

dc

min

V

ac

off

2V

d

–

R

in

P

o

•

V

ac

off

2N

•

•

--------------------------------------

2

–

P

o

C

------

1

fN

•

------------

2T

up

•

N

o

-------------------

+

•

–

•

=

V

dc

min

79.9

=

V

dc

min

79.9

=

C

CP

o

1

fN

•

------------

2T

up

•

N

o

-------------------

+

⎝⎠

⎛⎞

•

=

V

ac

off

2

•

V

d

–

R

in

P

o

•

V

ac

off

2N

•

•

--------------------------------------

–

⎝⎠

⎜⎟

V

dc

min

–

2

-------------------------------------------------------------------------------------------------------------------------

=

C60

10

6

–

•

=

+

-

G1

G=.0023

C1

60uF

R1 5.5

R2

1

R3

50k

R4

1

R5

1k

V1

FREQ = 60

VAMPL = 155V

VOFF = 1

D1

D1N4004

D2

D1N4004

D3

D1N4004

D4

D1N4004

V2

230V

1

2

U1

37mS

0

V

V

V

I

Time (ms)

Green: Bulk capacitor voltage

Blue: Load current