MAX5015ESA-G077 Maxim Integrated Products, MAX5015ESA-G077 Datasheet

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MAX5015ESA-G077

Manufacturer Part Number
MAX5015ESA-G077
Description
Current Mode PWM Controllers
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX5015ESA-G077

Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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.
19-2082; Rev 0; 7/01
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Current-Mode PWM Controllers with Integrated
TOP VIEW
Telecom Power Supplies
Industrial Power Supplies
Networking Power Supplies
Isolated Power Supplies
Startup Circuit for Isolated Power Supplies
SS_SHDN
OPTO
V
V+
DD
________________________________________________________________ Maxim Integrated Products
1
2
4
3
General Description
MAX5014/
MAX5015
8-SO
Pin Configuration
Applications
8
7
6
5
V
NDRV
GND
CS
CC
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
*See Selector Guide at end of data sheet.
MAX5014CSA*
MAX5014ESA*
MAX5015CSA*
MAX5015ESA*
V
IN
PART
V
SS_SHDN
DD
MAX5015
Typical Operating Circuit
V+
NDRV
OPTO
GND
V
-40°C to +85°C
-40°C to +85°C
CS
CC
TEMP. RANGE
Ordering Information
0°C to +70°C
0°C to +70°C
OPTOCOUPLER
PIN-PACKAGE
Features
8-SO
8-SO
8-SO
8-SO
V
OUT
1

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MAX5015ESA-G077 Summary of contents

Page 1

... 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 PART MAX5014CSA* MAX5014ESA* MAX5015CSA* MAX5015ESA* *See Selector Guide at end of data sheet. Applications SS_SHDN NDRV 6 ...

Page 2

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ABSOLUTE MAXIMUM RATINGS V+ to GND ……………………………………...……-0.3V to +120V V to GND.………………………………….……….-0.3V to +40V GND.………………….……………………-0.3V to +12.5V CC OPTO, NDRV, SS_SHDN GND .……-0.3V to ...

Page 3

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ELECTRICAL CHARACTERISTICS (continued 13V, a 10µF capacitor connects V DD cuit, OPTO = GND -40°C to +85°C, unless otherwise noted. Typical values are at T ...

Page 4

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies (V+ = 48V 13V, NRDV is open circuit MAX5015 MAXIMUM DUTY CYCLE vs. TEMPERATURE 48 GND OPTO 47.6 47.4 ...

Page 5

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies (V+ = 48V 13V, NRDV is open circuit NDRV FREQUENCY vs 271.0 270.5 270.0 269.5 269.0 268 4V GND ...

Page 6

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies PIN NAME High-Voltage Startup Input. Connect directly to an input voltage between 18V to 110V. Connects 1 V+ internally to a high-voltage linear regulator that generates ...

Page 7

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies HIGH- VOLTAGE GND REGULATOR EN OUT MAX5014 ONLY SLOPE COMPENSATION 26mV/µs 26mV/µs ∑ PWM OPTO SS_SHDN 2.4V 0.4V Figure 1. Functional Diagram _______________________________________________________________________________________ IN BIAS ...

Page 8

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies 1N4148 (36V TO 72V 47µF MAX5015 SS_SHDN C SS 0.1µF Figure 2. Forward Converter Optocoupled Feedback Isolated voltage feedback is ...

Page 9

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies MAX5014 SS_SHDN C SS Figure 3. Flyback Converter To reduce power dissipation the high-voltage regulator is disabled when the V voltage reaches 12.7V. ...

Page 10

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ms = × startup nF where C is the soft-start capacitor as shown in Figure 2. SS Operation begins when V SS_SHDN When soft-start ...

Page 11

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies V R REF OUT 1 where V is the reference voltage of the shunt REF regulator, and R and R are the resistors ...

Page 12

Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies ing equation to calculate the tertiary winding turns ratio DDMIN × ≤ IN_MIN + DDMAX × N ...

Page 13

... Startup Circuit for Isolated Power Supplies Table 1. Component Manufacturers Power FETS Current-Sense Resistors Diodes Capacitors Magnetics Selector Guide MAXIMUM PART DUTY CYCLE MAX5014CSA 85% MAX5014ESA 85% MAX5015CSA 50% MAX5015ESA 50% ______________________________________________________________________________________ International Rectifier Fairchild Vishay-Siliconix Dale-Vishay IRC On Semi General Semiconductor Central Semiconductor Sanyo Taiyo Yuden AVX Coiltronics Coilcraft Pulse Engineering ...

Page 14

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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