MAX5014CSA ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesApplicationsTelecom Power SuppliesV VIN OUTIndustrial Power SuppliesV+Networking Power SuppliesVDDI ..
MAX5014CSA ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesFeaturesThe MAX5014/MAX5015 integrate all the building Wide Input Range: (18V to 110V) or (13V to ..
MAX5014CSA ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesMAX5014/MAX501519-2082; Rev 0; 7/01Current-Mode PWM Controllers with IntegratedStartup Circuit for ..
MAX5014CSA+ ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesFeaturesThe MAX5014/MAX5015 integrate all the building♦ Wide Input Range: (18V to 110V) or (13V to ..
MAX5014ESA ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesApplicationsTelecom Power SuppliesV VIN OUTIndustrial Power SuppliesV+Networking Power SuppliesVDDI ..
MAX5014ESA ,Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power SuppliesFeaturesThe MAX5014/MAX5015 integrate all the building Wide Input Range: (18V to 110V) or (13V to ..
MAX9163ESA ,Bus LVDS 3.3V Single TransceiverELECTRICAL CHARACTERISTICS(V = 3.0V to 3.6V, RE = 0, |V | = 0.1V to 2.9V, common-mode input voltage ..
MAX9164ESD ,3.3V Single LVDS Driver/ReceiverApplicationsROUT 4 11 DO-MAX9164Cell-Phone Base Stations Network Switches/RoutersN.C. 5 10 RI+Add/D ..
MAX9169EUE ,4-Port LVDS and LVTTL-to-LVDS RepeatersELECTRICAL CHARACTERISTICS(V = 3.0V to 3.6V, R = 100Ω ±1%, EN_ = high, MAX9169 differential input v ..
MAX9169EUE+T ,4-Port LVDS and LVTTL-to-LVDS Repeatersapplications that require high-speed data or clock23630Mbps (2 - 1) PRBS Patterndistribution while ..
MAX9170ESE ,4-Port LVDS and LVTTL-to-LVDS Repeatersapplications that require high-speed data or clock23630Mbps (2 - 1) PRBS Patterndistribution while ..
MAX9170EUE+ ,4-Port LVDS and LVTTL-to-LVDS RepeatersELECTRICAL CHARACTERISTICS(V = 3.0V to 3.6V, R = 100Ω ±1%, EN_ = high, MAX9169 differential input v ..
MAX5014CSA-MAX5014ESA-MAX5015CSA-MAX5015ESA
Current-Mode PWM Controllers with Integrated Startup Circuit for Isolated Power Supplies
General DescriptionThe 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 tooperate with high voltages. Exercise caution.
ApplicationsTelecom Power Supplies
Industrial Power Supplies
Networking Power Supplies
Isolated Power Supplies
FeaturesWide Input Range: (18V to 110V) or (13V to 36V)Current-Mode ControlLeading-Edge BlankingInternally Trimmed 275kHz ±10% OscillatorLow External Component CountSoft-StartHigh-Voltage Startup CircuitPulse-by-Pulse Current LimitingThermal ShutdownSO-8 Package
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
Pin Configuration
Ordering Informationypical Operating Circuit19-2082; Rev 0; 7/01
*See Selector Guide at end of data sheet.
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= 13V, a 10µF capacitor connects VCCto GND, VCS= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir-
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
VDDto GND.………………………………….……….-0.3V to +40V
VCCto GND.………………….……………………-0.3V to +12.5V
OPTO, NDRV, SS_SHDN, CS to GND .……-0.3V to VCC+ 0.3V
VDDand VCCCurrent …………………...…………………..20mA
NDRV Current Continuous...………………………………….25mA
NDRV Current for Less than 1µs..………….…………….……±1A
Continuous Power Dissipation (TA= +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
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
ELECTRICAL CHARACTERISTICS (continued)(VDD= 13V, a 10µF capacitor connects VCCto GND, VCS= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir-
cuit, OPTO = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Typical Operating Characteristics(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power SuppliesMAX5015 MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5014 toc04
TEMPERATURE (°C)
MAX DUTY CYCLE (%)
V+ SUPPLY CURRENT
vs. TEMPERATUREMAX5014 toc05
V+ INPUT CURRENT (mA)
TEMPERATURE (°C)
SOFT-START SOURCE CURRENT
vs. TEMPERATURE
MAX5014 toc06
TEMPERATURE (°C)
SOFT-START SOURCE CURRENT (
V+ INPUT CURRENT vs.
TEMPERATURE (AFTER STARTUP)
MAX5014 toc07
TEMPERATURE (°C)
V+ INPUT CURRENT (
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5014 toc08
TEMPERATURE (°C)
V+ SHUTDOWN CURRENT (
CS THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX5014 toc09
TEMPERATURE (°C)
CS THRESHOLD VOLTAGE (V)
NDRV RESISTANCE
vs. TEMPERATUREMAX5014 toc10
NDRV RESISTANCE (
TEMPERATURE (°C)
CURRENT-LIMIT DELAY
vs. TEMPERATURE
MAX5014 toc11
TEMPERATURE (°C)
CURRENT LIMIT DELAY (ns)
VSS_SHDN vs. VDD
MAX5014
toc12
VDD (V)
SS_SHDN
(V)
Typical Operating Characteristics (continued)(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
Typical Operating Characteristics (continued)(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)
MAX5014/MAX5015
Detailed DescriptionUse the MAX5014/MAX5015 PWM current-mode con-
trollers to design flyback- or forward-mode power sup-
plies. Current-mode operation simplifies control-loop
design while enhancing loop stability. An internal high-
voltage startup regulator allows the device to connect
directly to the input supply without an external startup
resistor. Current from the internal regulator starts the
controller. Once the tertiary winding voltage is estab-
lished the internal regulator is switched off and bias
current for running the IC is derived from the tertiary
winding. The internal oscillator is set to 275kHz and
trimmed to ±10%. This permits the use of small mag-
netic components to minimize board space. Both the
MAX5014 and MAX5015 can be used in power sup-
plies providing multiple output voltages. A functional
diagram of the IC is shown in Figure 1. Typical applica-
tions circuits for forward and flyback topologies are
shown in Figure 2 and Figure 3, respectively.
Current-Mode ControlThe MAX5014/MAX5015 offer current-mode control
operation with added features such as leading-edge
blanking with dual internal path that only blanks the
sensed current signal applied to the input of the PWM
comparator. The current limit comparator monitors the
CS pin at all times and provides cycle-by-cycle current
limit without being blanked. The leading-edge blanking
of the CS signal prevents the PWM comparator from
prematurely terminating the on cycle. The CS signal
contains a leading-edge spike that is the result of the
MOSFET gate charge current, capacitive and diode
reverse recovery current of the power circuit. Since this
leading-edge spike is normally lower than the current
limit comparator threshold, current limiting is not
blanked and cycle-by-cycle current limiting is provided
under all conditions.
Use the MAX5014 in discontinuous flyback applications
where wide line voltage and load current variation is
expected. Use the MAX5015 for single transistor for-
ward converters where the maximum duty cycle must
be limited to less than 50%.
Under certain conditions it may be advantageous to
use a forward converter with greater than 50% duty
cycle. For those cases use the MAX5014. The large
duty cycle results in much lower operating primary
RMS currents through the MOSFET switch and in most
cases a smaller output filter inductor. The major disad-
vantage to this is that the MOSFET voltage rating must
be higher and that slope compensation must be provid-
ed to stabilize the inner current loop. The MAX5014
provides internal slope compensation.
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power SuppliesFigure 1. Functional Diagram
