MAX5015ESA-T Maxim Integrated Products, MAX5015ESA-T Datasheet - Page 9
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MAX5015ESA-T
Manufacturer Part Number
MAX5015ESA-T
Description
Current Mode PWM Controllers w/Integrated Startup
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5015ESA.pdf
(14 pages)
Specifications of MAX5015ESA-T
Number Of Outputs
1
Duty Cycle (max)
50 %
Output Current
1000 mA
Mounting Style
SMD/SMT
Package / Case
SOIC-8 Narrow
Switching Frequency
275 KHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
Topology
Flyback, Forward
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
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