MAX5014 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies

19-2082; Rev 0; 7/01
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Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
General Description
The MAX5014/MAX5015 integrate all the building
blocks necessary for implementing DC-DC fixed-fre-
quency isolated power supplies. These devices are
current-mode controllers with an integrated high-volt-
age startup circuit suitable for isolated telecom/industri-
al voltage range power supplies. Current-mode control
with leading-edge blanking simplifies control-loop
design and internal ramp compensation circuitry stabi-
lizes the current loop when operating at duty cycles
above 50% (MAX5014). The MAX5014 allows 85%
operating duty cycle and could be used to implement
flyback converters, whereas the MAX5015 limits the
operating duty cycle to less than 50% and can be used
in single-ended forward converters. A high-voltage
startup circuit allows these devices to draw power
directly from the 18V to 110V input supply during start-
up. The switching frequency is internally trimmed to
275kHz ±10%, thus reducing magnetics and filter com-
ponent costs.
The MAX5014/MAX5015 are available in 8-pin SO
packages. An evaluation kit (MAX5015EVKIT) is also
available.
Warning: The MAX5014/MAX5015 are designed to
operate with high voltages. Exercise caution.
Applications
Telecom Power Supplies
Industrial Power Supplies
Networking Power Supplies
Isolated Power Supplies
TOP VIEW
Pin Configuration
Features
o Wide Input Range: (18V to 110V) or (13V to 36V)
o Current-Mode Control
o Leading-Edge Blanking
o Internally Trimmed 275kHz ±10% Oscillator
o Low External Component Count
o Soft-Start
o High-Voltage Startup Circuit
o Pulse-by-Pulse Current Limiting
o Thermal Shutdown
o SO-8 Package
Ordering Information
PART
TEMP. RANGE
MAX5014CSA*
0°C to +70°C
MAX5014ESA*
-40°C to +85°C
MAX5015CSA*
0°C to +70°C
MAX5015ESA*
-40°C to +85°C
*See Selector Guide at end of data sheet.
PIN-PACKAGE
8-SO
8-SO
8-SO
8-SO
Typical Operating Circuit
V_IN
V_DD
V+
V_OUT
NDRV
CS
MAX5015
GND
SS_SHDN
V_CC
V+ 1
V_DD 2
OPTO 3
SS_SHDN 4
MAX5014/
MAX5015
8 V_CC
7 NDRV
6 GND
5 CS
OPTO
OPTOCOUPLER
8-SO
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