Rainbow-electronics MAX15001 Manual do Utilizador descarregar pdf (Página 14)

MAX15000/MAX15001

Primary-Side-Regulated,

Isolated Telecom Power Supply

Figure 6 shows a complete circuit of a dual-output

power supply with a telecom voltage range of 36V to

72V. An important aspect of this power supply is that it

is primary-side regulated. The regulation through the

tertiary winding also supplies bias for the MAX15000.

In the circuit of Figure 6, cross-regulation has been

improved (tertiary and 5V outputs) by using chip induc-

tors, L1 and L2, and R7||R12 across C12. R7||R12 pre-

sents enough loading on the tertiary winding output to

allow ±10% load regulation on the 5V output over a

load current range from 150mA to 1.5A (Figure 7).

Current-Mode PWM Controllers with

Programmable Switching Frequency

14 ______________________________________________________________________________________

MAX15000A

+VIN

UFLG

-VIN

VOUT2

15V/100mA

5V/1.5A

SGND

VOUT1

SGND

OPEN

R12

1.2kΩ

0.0047µF

250VAC

68µF

6.3V

12T

C15

1µF

C13

1µF

22µF

6.3V

28T

35µH

15T

IRF7464

1.2kΩ

OPEN

C10

OPEN

0.600Ω

R15

750Ω

C16

1µF

35V

33kΩ

47µF

25V

FB_P

36V TO 72V

+VIN

NDRV

GND

FB_P

COMP

UVLO/EN

UFLG

NOTE: MOSFET N1 = IR IRF7464.

JU1

+VIN

C12

15µF

35V

R14

14.3kΩ

C17

OPEN

100pF

C14

3900pF

51.1kΩ

1.37MΩ

75kΩ

2.49kΩ

22.6kΩ

R13

10kΩ

OPEN

0.22µF

C11

0.22µF

C19

OPEN

C18

0.1µF

R11

100Ω

UFLG_PULL

SHDN

R10

4.7Ω

1µF

100V

1µF

100V

Figure 6. Primary-Side-Regulated, Dual-Output, Isolated Telecom Power Supply

5V OUTPUT LOAD REGULATION

MAX15000 fig07

OUT

(A)

OUT

(V)

1.351.200.30 0.45 0.60 0.900.75 1.05

4.9

5.0

5.1

5.2

5.3

5.4

5.5

5.6

4.8

0.15 1.50

NO LOAD AT 15V

OUTPUT

IN+

= 40V

IN-

= 0V

Figure 7. Output Voltage Regulation for the Circuit in Figure 6

1 2 ... 9 10 11 12 13 14 15 16 17 18

MAX15000/MAX15001 1

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