MAX5015CSA+ Maxim Integrated Products, MAX5015CSA+ Datasheet - Page 9

• Manufacturer Part Number: MAX5015CSA+
• Description: IC CNTRLR PWM CRNT MD 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of MAX5015CSA+

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 275kHz
• Duty Cycle: 50%
• Voltage - Supply: 18 V ~ 110 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 275kHz
• Duty Cycle (max): 50 %
• Output Current: 1000 mA
• Mounting Style: SMD/SMT
• Switching Frequency: 275 KHz
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Synchronous Pin: No
• Topology: Flyback, Forward
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 3. Flyback Converter
To reduce power dissipation the high-voltage regulator
is disabled when the V
greatly reduces power dissipation and improves effi-
ciency. If V
threshold (V
abled, and soft-start is reinitiated. In undervoltage lock-
out the MOSFET driver output (NDRV) is held low.
If the input voltage range is between 13V and 36V, V+
and V
ed that the maximum power dissipation is not exceed-
ed. This eliminates the need for a tertiary winding.
Current-Mode PWM Controllers with Integrated
DD
may be connected to the line voltage provid-
Startup Circuit for Isolated Power Supplies
CC
CC
= 6.6V), the low-voltage regulator is dis-
falls below the undervoltage lockout
_______________________________________________________________________________________
C
C
V
DD
IN
SS
DD
voltage reaches 12.7V. This
V
SS_SHDN
DD
MAX5014
V+
NDRV
OPTO
GND
V
CS
CC
100Ω
N
C
T
M1
IN
N
P
OPTOCOUPLER
250VAC
The soft-start feature of the MAX5014/MAX5015 allows
the load voltage to ramp up in a controlled manner,
thus eliminating output voltage overshoot.
While the part is in UVLO, the capacitor connected to
the SS_SHDN pin is discharged. Upon coming out of
UVLO an internal current source starts charging the
capacitor to initiate the soft-start cycle. Use the follow-
ing equation to calculate total soft-start time:
4.7nF
R
C
Undervoltage Lockout (UVLO), Soft-Start,
SENSE
CC
N
S
C
OUT
TLV431
220Ω
V
OUT
R
R
1
2
and Shutdown
9