MAX5015ESA+ ,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 ..
MAX5015ESA+ ,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 ..
MAX5019CSA ,Current-mode PWM controller with integrated startup circuitELECTRICAL CHARACTERISTICS(V = 13V, a 10µF capacitor connects V to GND, V = 0, V+ = 48V, 0.1µF capa ..
MAX5019CSA+ ,Current-Mode PWM Controllers with Integrated Startup CircuitApplicationsMAX5020ESA* -40°C to +85°C8-SO*See Selector Guide at end of data sheet.Telecom Power Su ..
MAX5019ESA ,Current-Mode PWM Controllers with Integrated Startup CircuitMAX5019/MAX502019-2115; Rev 0; 7/01Current-Mode PWM Controllers with IntegratedStartup Circuit
MAX5019ESA+ ,Current-Mode PWM Controllers with Integrated Startup CircuitELECTRICAL CHARACTERISTICS(V = 13V, a 10µF capacitor connects V to GND, V = 0, V+ = 48V, 0.1µF capa ..
MAX9173EUE+ ,Quad LVDS Line Receiver with Flow-Through Pinout and "In-Path" Fail-Safeapplications requiring♦ Fully Compatible with DS90LV048Ahigh data rates, low power, and low noise. ..
MAX9173EUE+T ,Quad LVDS Line Receiver with Flow-Through Pinout and "In-Path" Fail-SafeELECTRICAL CHARACTERISTICS(V = 3.0V to 3.6V, differential input voltage |V | = 0.1V to 1.2V, common ..
MAX9174EUB+ ,670MHz LVDS-to-LVDS and Anything-to-LVDS 1:2 SplittersApplicationsMAX9174ETB* -40°C to +85°C 10 Thin QFN-EP**Protection SwitchingMAX9175EUB -40°C to +85° ..
MAX9175EUB ,670MHz LVDS-to-LVDS and Anything-to-LVDS 1:2 Splittersfeatures a fail-safe circuit that dri-♦ Low-Power CMOS Designves the outputs high when the input is ..
MAX9175EUB+ ,670MHz LVDS-to-LVDS and Anything-to-LVDS 1:2 SplittersELECTRICAL CHARACTERISTICS(V = +3.0V to +3.6V, R = 100Ω ±1%, PD_ = high, differential input voltage ..
MAX9176EUB ,670MHz LVDS-to-LVDS and Anything-to-LVDS 2:1 MultiplexersApplications Ordering InformationProtection SwitchingPART TEMP RANGE PIN-PACKAGELoopbackMAX9176EUB ..
MAX5014CSA+-MAX5014ESA+-MAX5014ESA+T-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 SuppliesGND
VCC
NDRVVDD
OPTO
8-SOTOP VIEW
MAX5014/
MAX5015
SS_SHDN
Pin Configuration
Ordering InformationMAX5015
VDDV+
SS_SHDN
NDRV
GND
VCC
OPTO
VINVOUT
OPTOCOUPLER
ypical Operating Circuit19-2082; Rev 0; 7/01
EVALUATION KITAVAILABLE
PARTTEMP. RANGEPIN-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
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-
cuit, OPTO = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +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
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SUPPLY CURRENTIV+(NS)VDD = 0, V+ = 110V, driver not switching0.851.3
V+ Supply CurrentIV+(S)V+ = 110V, VDD = 0, VOPTO = 4V,
driver switching1.42.6mA
V+ Supply Current After StartupV+ = 110V, VDD = 13V, VOPTO = 4V11µA
IVDD(NS)VDD = 36V, driver not switching0.91.3V D D S up p l y C ur r entIVDD(S)VDD = 36V, driver switching, VOPTO = 4V1.92.7mA
V+ Shutdown CurrentVSS_SHDN = 0, V+ = 110V190290µA
VDD Shutdown CurrentVSS_SHDN = 0820µA
PREREGULATOR/STARTUPV+ Input Voltage18110V
VDD Supply Voltage1336V
INTERNAL REGULATORS (VCC)Powered from V+, ICC = 7.5mA, VDD = 07.59.812VVCC Output VoltagePowered from VDD, ICC = 7.5mA9.010.011.0V
VCC Undervoltage LockoutVCC_UVLOVCC falling6.6V
OUTPUT DRIVERPeak Source CurrentVCC = 11V, (externally forced)570mA
Peak Sink CurrentVCC = 11V, (externally forced)1000mA
NRDV High-Side Driver
ResistanceROHVCC = 11V, externally forced,
NDRV sourcing 50mA412Ω
NDRV Low Side Driver
ResistanceROLVCC = 11V, externally forced,
NDRV sinking 50mA1.64Ω
PWM COMPARATOROPTO Input Bias C ur r entVOPTO = VSS_SHDN-1.001.00µA
OPTO Control Range23V
Slope CompensationVSCOMPMAX501426mV/µs
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.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
THERMAL SHUTDOWNThermal Shutdown Temperature150°C
Thermal Hysteresis25°C
CURRENT LIMITCS Threshold VoltageVILIMVOPTO = 4V419465510mV
CS Input Bias Current0 ≤ VCS ≤ 2V, VOPTO = 4V-11µA
Current Limit Comparator
Propagation Delay25mV overdrive on CS, VOPTO = 4V180ns
CS Blanking TimeVOPTO = 4V70ns
OSCILLATORClock Frequency RangeVOPTO = 4V247275302kHz
MAX5014, VOPTO = 4V7585Max Duty CycleMAX5015, VOPTO = 4V4450%
SOFT-STARTSS Source CurrentISSOVSS_SHDN = 02.04.66.5µA
SS Sink Current1.0mA
Peak Soft-Start Voltage ClampNo external load2.3312.4202.500V
VSS_SHDN falling0.250.370.41Shutdown ThresholdVSS_SHDN rising0.530.590.65V
Typical Operating Characteristics(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)
VSS_SHDN vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5014 toc01
TEMPERATURE (°C)
OPTO = CS = GND
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
NDRV FREQUENCY vs.
TEMPERATURE
MAX5014 toc02
TEMPERATURE (°C)
NDRV FREQUENCY (kHz)
VOPTO = 4V, CS = GND
MAX5014 MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5014 toc03
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE (%)
VOPTO = 4V, CS = GND
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 (%)
VOPTO = 4V, CS = GND
V+ SUPPLY CURRENT
vs. TEMPERATUREMAX5014 toc05
V+ INPUT CURRENT (mA)
TEMPERATURE (°C)
VOPTO = 4V, VDD = CS = GND
SOFT-START SOURCE CURRENT
vs. TEMPERATURE
MAX5014 toc06
TEMPERATURE (°C)
SOFT-START SOURCE CURRENT (
VDD = 0, V+ = 110V, OPTO =
CS = SS_SHDN = GND
V+ INPUT CURRENT vs.
TEMPERATURE (AFTER STARTUP)
MAX5014 toc07
TEMPERATURE (°C)
V+ INPUT CURRENT (
V+ = 110V, VOPTO = 4V,
CS = GND, VDD = 13V
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
MAX5014 toc08
TEMPERATURE (°C)
V+ SHUTDOWN CURRENT (V+ = 110V, OPTO = SS_SHDN =
CS = GND, VDD = 13V
CS THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX5014 toc09
TEMPERATURE (°C)
CS THRESHOLD VOLTAGE (V)
VOPTO = 4V, V+ = 110V
NDRV RESISTANCE
vs. TEMPERATUREMAX5014 toc10
NDRV RESISTANCE (
TEMPERATURE (°C)
HIGH-SIDE DRIVER
LOW-SIDE DRIVER
CURRENT-LIMIT DELAY
vs. TEMPERATURE
MAX5014 toc11
TEMPERATURE (°C)
CURRENT LIMIT DELAY (ns)
VOPTO = 4V, 100mV OVERDRIVE ON CS
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.)
NDRV FREQUENCY vs. VDD
MAX5014 toc13
VDD (V)
NDRV FREQUENCY (kHz)VOPTO = 4V, CS = GND
MAX5015 MAXIMUM DUTY
CYCLE vs.VDD
MAX5014 toc14
VDD (V)
MAXIMUM DUTY CYCLE (%)
VOPTO = 4V, CS = GND
DRIVER POWERED
FROM V+
DRIVER POWERED
FROM VDD
VCC vs. VDD
MAX5014 toc15
VDD (V)
(V)
DEVICE POWERED FROM VDD
DEVICE POWERED
FROM V+
V+ SUPPLY CURRENT vs.
V+ VOLTAGE
MAX5014 toc16
V+ VOLTAGE (V)
V+ SUPPLY CURRENT (mA)
VOPTO = 4V, CS = GND, VDD = 0
V+ INPUT CURRENT vs. VOLTAGE
(AFTER STARTUP)
MAX5014 toc17
V+ VOLTAGE (V)
V+ INPUT CURRENT (
VOPTO = 4V, CS = GND, VDD = 13V
VCC VOLTAGE vs. VCC CURRENT
MAX5014 toc18
VCC CURRENT (mA)
VOLTAGE (V)5.010.015.020.0
V+ = 110V, OPTO = CS = GND
VDD = 36V
VDD = 13V
VCC VOLTAGE vs. VCC CURRENT
MAX5014
toc19
VCC CURRENT (mA)
VOLTAGE (V)
VDD = OPTO = CS = GND
V+ = 110V
V+ = 90V
V+ = 72V
V+ = 48V
V+ = 36V
V+ = 24V
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
Pin Description
PINNAMEFUNCTION1V+High-Voltage Startup Input. Connect directly to an input voltage between 18V to 110V. Connects
internally to a high-voltage linear regulator that generates VCC during startup.
2VDD
VDD is the Input of the Linear Regulator that Generates VCC. For supply voltages less than 36V, VDD
and V+ can both be connected to the supply. For supply voltages greater than 36V, VDD receives
its power from the tertiary winding of the transformer and accepts voltages from 13V to 36V. Bypass
to GND with a 4.7µF capacitor.OPTOOptocoupler Input. The control voltage range on this input is 2V to 3V.SS_SHDN
Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 0.45ms/nF.
This pin is also the reference voltage output. Bypass with a minimum 10nF capacitor to GND. The
device goes into shutdown when VSS_SHDN is pulled below 0.25V.
5CS
Current Sense Input. Turns power switch off if VCS rises above 465mV for cycle-by-cycle current
limiting. CS is also the feedback for the current-mode controller. CS is connected to the PWM
comparator through a leading edge blanking circuit.GNDGroundNDRVGate Drive. Drives a high-voltage external N-channel power MOSFET.
8VCC
Regulated IC Supply. Provides power for the entire IC. VCC is regulated from VDD during normal
operation and from V+ during startup. Bypass VCC with a 10μF tantalum capacitor in parallel with
0.1µF ceramic capacitor to GND.
MAX5014/MAX5015
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power SuppliesHIGH-
VOLTAGE
REGULATOROUT
BIAS
WINDING
REGULATOROUT
SLOPE
COMPENSATION
26mV/μs
275kHz
OSCILLATOR
70ns
BLANKING
80%/50%
DUTY CYCLE
CLAMP
ILIM
BUF
UVLO
GND
VDD
OPTO
SS_SHDN
PWM
VDD-OK
VCC
NDRV
4μA
5kΩ
2.4V
6.6V
0.7V
125mV
0.4V
26mV/μs
MAX5014 ONLY
Figure 1. Functional Diagram
