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MAX5015ESA+T

P1-P3P4-P6P7-P9P10-P12P13-P14
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
Features
♦ Wide Input Range: (18V to 110V) or (13V to 36V)
♦ Current-Mode Control
♦ Leading-Edge Blanking
♦ Internally Trimmed 275kHz ±10% Oscillator
♦ Low External Component Count
♦ Soft-Start
♦ High-Voltage Startup Circuit
♦ Pulse-by-Pulse Current Limiting
♦ Thermal Shutdown
♦ SO-8 Package
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
________________________________________________________________ Maxim Integrated Products 1
GND
CS
1
2
8
7
V
CC
NDRVV
DD
OPTO
V+
8-SO
TOP VIEW
3
4
6
5
MAX5014/
MAX5015
SS_SHDN
Pin Configuration
Ordering Information
MAX5015
V
DD
V+
SS_SHDN
NDRV
CS
GND
V
CC
OPTO
V
IN
V
OUT
OPTOCOUPLER
Typical Operating Circuit
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.
EVALUATION KIT
AVAILABLE
PART TEMP. RANGE PIN-PACKAGE
MAX5014CSA* 0°C to +70°C8-SO
MAX5014ESA* -40°C to +85°C8-SO
MAX5015CSA* 0°C to +70°C8-SO
MAX5015ESA* -40°C to +85°C8-SO
*See Selector Guide at end of data sheet.
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 13V, a 10µF capacitor connects V
CC
to GND, V
CS
= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir-
cuit, OPTO = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
V+ to GND……………………………………...……-0.3V to +120V
V
DD
to GND.………………………………….……….-0.3V to +40V
V
CC
to GND.………………….……………………-0.3V to +12.5V
OPTO, NDRV, SS_SHDN, CS to GND .……-0.3V to V
CC
+ 0.3V
V
DD
and V
CC
Current …………………...…………………..20mA
NDRV Current Continuous...………………………………….25mA
NDRV Current for Less than 1µs..………….…………….……±1A
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C) .………....471mW
Operating Temperature Range…………..……...-40°C to +85°C
Storage Temperature Range……………..…….-65°C to +150°C
Lead Temperature (soldering, 10s) ………………………+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SUPPLY CURRENT
I
V+
(
NS
)
V
DD
= 0, V+ = 110V, driver not switching 0.85 1.3
V+ Supply Current
I
V+(S)
V+ = 110V, V
DD
= 0, V
OPTO
= 4V,
driver switching
1.4 2.6
mA
V+ Supply Current After Startup V+ = 110V, V
DD
= 13V, V
OPTO
= 4V 11 µA
I
VDD
(
NS
)
V
DD
= 36V, driver not switching 0.9 1.3
V
D D
S up p l y C ur r ent
I
VDD
(
S
)
V
DD
= 36V, driver switching, V
OPTO
= 4V 1.9 2.7
mA
V+ Shutdown Current V
SS_SHDN
= 0, V+ = 110V 190 290 µA
V
DD
Shutdown Current V
SS_SHDN
= 0 8 20 µA
PREREGULATOR/STARTUP
V+ Input Voltage 18 110 V
V
DD
Supply Voltage 13 36 V
INTERNAL REGULATORS (V
CC
)
Powered from V+, I
CC
= 7.5mA, V
DD
= 0 7.5 9.8 12 V
V
CC
Output Voltage
Powered from V
DD
, I
CC
= 7.5mA 9.0 10.0 11.0 V
V
CC
Undervoltage Lockout V
CC_UVLO
V
CC
falling 6.6 V
OUTPUT DRIVER
Peak Source Current V
CC
= 11V, (externally forced) 570 mA
Peak Sink Current V
CC
= 11V, (externally forced) 1000 mA
NRDV High-Side Driver
Resistance
R
OH
V
CC
= 11V, externally forced,
NDRV sourcing 50mA
412Ω
NDRV Low Side Driver
Resistance
R
OL
V
CC
= 11V, externally forced,
NDRV sinking 50mA
1.6 4 Ω
PWM COMPARATOR
OPTO Input Bias C ur r ent V
OPTO =
V
SS_SHDN
-1.00 1.00 µA
OPTO Control Range 23V
Slope Compensation V
SCOMP
MAX5014 26 mV/µs
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 13V, a 10µF capacitor connects V
CC
to GND, V
CS
= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir-
cuit, OPTO = GND, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
THERMAL SHUTDOWN
Thermal Shutdown Temperature 150 °C
Thermal Hysteresis 25 °C
CURRENT LIMIT
CS Threshold Voltage V
ILIM
V
OPTO
= 4V 419 465 510 mV
CS Input Bias Current 0 ≤ V
CS
≤ 2V, V
OPTO
= 4V -1 1 µA
Current Limit Comparator
Propagation Delay
25mV overdrive on CS, V
OPTO
= 4V 180 ns
CS Blanking Time V
OPTO
= 4V 70 ns
OSCILLATOR
Clock Frequency Range V
OPTO
= 4V 247 275 302 kHz
MAX5014, V
OPTO
= 4V 75 85
Max Duty Cycle
MAX5015, V
OPTO
= 4V 44 50
%
SOFT-START
SS Source Current I
SSO
V
SS_SHDN
= 0 2.0 4.6 6.5 µA
SS Sink Current 1.0 mA
Peak Soft-Start Voltage Clamp No external load 2.331 2.420 2.500 V
V
SS_SHDN
falling 0.25 0.37 0.41
Shutdown Threshold
V
SS_SHDN
rising 0.53 0.59 0.65
V
Typical Operating Characteristics
(V+ = 48V, V
DD
= 13V, NRDV is open circuit, T
A
= +25°C, unless otherwise noted.)
0.999
1.000
1.001
1.002
1.003
-40 0-20 20 40 60 80
V
SS_SHDN
vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5014 toc01
TEMPERATURE (°C)
OPTO = CS = GND
V
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
273
274
276
275
277
278
-40 0-20 20 40 60 80
NDRV FREQUENCY vs.
TEMPERATURE
MAX5014 toc02
TEMPERATURE (°C)
NDRV FREQUENCY (kHz)
V
OPTO
= 4V, CS = GND
80.4
80.6
80.5
80.8
80.7
80.9
81.0
-40 20 40-20 0 60 80
MAX5014 MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5014 toc03
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE (%)
V
OPTO
= 4V, CS = GND
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX5015ESA+T

Mfr. #:
Buy MAX5015ESA+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers w/Integrated Startup
Lifecycle:
New from this manufacturer.
Delivery:
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