MAX15000AEUB+ Maxim Integrated Products, MAX15000AEUB+ Datasheet - Page 14

• Manufacturer Part Number: MAX15000AEUB+
• Description: IC CNTRLR PWM CURRENT MD 10UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX15000AEUB+

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 2.5MHz
• Duty Cycle: 50%
• Voltage - Supply: 23.6 V ~ 30 V
• Buck: No
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Frequency-max: 2.5MHz
• Duty Cycle (max): 50 %
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 25 KHz to 625 KHz
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• Topology: Boost
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
Figure 6. Primary-Side-Regulated, Dual-Output, Isolated Telecom Power Supply
14
1.37MΩ
51.1kΩ
1%
NOTE: MOSFET N1 = IR IRF7464.
______________________________________________________________________________________
R3
R4
FB_P
+VIN
36V TO 72V
+VIN
-VIN
OPEN
SHDN
C17
22.6kΩ
2.49kΩ
1%
1%
R1
R2
+VIN
1
2
Isolated Telecom Power Supply
JU1
IN
75kΩ
1%
UFLG_PULL
R6
33kΩ
R9
C1
1µF
100V
UFLG
3900pF
0.22µF
100pF
C14
10kΩ
Primary-Side-Regulated,
C7
R13
C9
C16
1µF
35V
C2
1µF
100V
D8
3
4
1
9
2
FB_P
FB
COMP
UVLO/EN
V
UFLG
CC
C12
15µF
35V
MAX15000A
U1
R7
1.2kΩ
NDRV
GND
CS
RT
IN
R12
1.2kΩ
10
8
5
7
6
IN
R8
OPEN
C11
0.22µF
C8
OPEN
R14
14.3kΩ
1%
D7
OPEN
D6
100Ω
4.7Ω
R11
R10
C10
OPEN
OPEN
R15
750Ω
C18
0.1µF
D3
4
Figure 7. Output Voltage Regulation for the Circuit in Figure 6
L2
5
1
6
35µH
2
15T
28T
7
N1 IRF7464
3
4
8
R5
0.600Ω
1%
C19
OPEN
5 T1
3
2
1
9
10
7
5.6
5.5
5.4
5.3
5.2
5.1
5.0
4.9
4.8
8
6
12T
5T
0.15
C6
0.0047µF
250VAC
D2
D1
0.30 0.45 0.60
5V OUTPUT LOAD REGULATION
C5
47µF
25V
C3
68µF
6.3V
0.75
I
OUT
15V/100mA
D5
D4
0.90
(A)
L1
NO LOAD AT 15V
OUTPUT
V
V
1.05
IN+
IN-
= 0V
= 40V
1.20
5V/1.5A
C15
1µF
C13
1µF
1.35
1.50
C4
22µF
6.3V
VOUT2
SGND
VOUT1
SGND