MAX5021EUA+ Maxim Integrated Products, MAX5021EUA+ Datasheet - Page 8
![IC CNTRLR PWM CRNT MD 8-UMAX](/photos/1/39/13936/406-8-msop_sml.jpg)
MAX5021EUA+
Manufacturer Part Number
MAX5021EUA+
Description
IC CNTRLR PWM CRNT MD 8-UMAX
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5021EUTT.pdf
(11 pages)
Specifications of MAX5021EUA+
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
290kHz
Duty Cycle
51%
Voltage - Supply
11 V ~ 28 V
Buck
No
Boost
No
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 85°C
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Frequency-max
290kHz
Duty Cycle (max)
50 %
Output Current
250 mA
Mounting Style
SMD/SMT
Switching Frequency
262 KHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
Topology
Flyback, Forward
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
WARNING! DANGEROUS AND LETHAL VOLTAGES
ARE PRESENT IN OFF-LINE CIRCUITS! USE
EXTREME CAUTION IN THE CONSTRUCTION,
TESTING, AND USE OF OFF-LINE CIRCUITS.
Figure 4 shows a -48VDC telecom power supply capa-
ble of generating an isolated +5V output.
All printed circuit board traces carrying switching cur-
rents must be kept as short as possible, and the cur-
rent loops they form must be minimized. The pins of the
SOT23 package have been placed to allow simple
interfacing to the external MOSFET. The order of these
pins directly corresponds to the order of a TO-220 or
similar package MOSFET.
For universal AC input design all applicable safety reg-
ulations must be followed. Off-line power supplies may
require UL, VDE, and other similar agency approvals.
These agencies can be contacted for the latest layout
and component rules.
Typically there are two sources of noise emission in a
switching power supply: high di/dt loops and high dv/dt
surfaces. For example, traces that carry the drain cur-
rent often form high di/dt loops. Similarly the heatsink of
the MOSFET presents a dv/dt source, thus the surface
area of the heatsink must be minimized as much
as possible.
Current-Mode PWM Controllers for Isolated
Power Supplies
Figure 4. -48VDC Input to +5V Output
8
_______________________________________________________________________________________
-36VDC TO -72VDC IN
Isolated Telecom Power Supply
Layout Recommendations
C3
V
OPTO
GND
CC
MAX5022
NDRV
V
CS
IN
R
C2
S
To achieve best performance, a star ground connection
is recommended to avoid ground loops. For example,
the ground returns for the power-line input filter, power
MOSFET switch, and sense resistor should be routed
separately through wide copper traces to meet at a sin-
gle system ground connection.
TRANSISTOR COUNT: 519
PROCESS: BiCMOS
T1
Chip Information
V
OUT