•Maximum Duty Cycle Limiting (80% for
LM5020-1 or 50% for LM5020-2)
•Programmable Line Under Voltage Lockout
(UVLO) with Adjustable Hysteresis
•Cycle-by-Cycle Over-Current Protection
•Slope Compensation (LM5020-1)
•Programmable Oscillator Frequency with
Synchronization Capability
•Current Sense Leading Edge Blanking
•Thermal Shutdown Protection
APPLICATIONS
•Telecommunication Power Converters
•Industrial Power Converters
•+42V Automotive Systems
PACKAGES
•VSSOP-10
DESCRIPTION
The LM5020 high voltage pulse-width-modulation
(PWM) controller contains all of the features needed
to implement single ended primary power converter
topologies. Output voltage regulation is based on
current-mode control, which eases the design of loop
compensation while providing inherent line feedforward. The LM5020 includes a high-voltage start-up
regulator that operates over a wide input range up to
100V. The PWM controller is designed for high speed
capability including an oscillator frequency range to
1MHz and total propagation delays less than 100ns.
Additionalfeaturesincludeanerroramplifier,
precision reference, line under-voltage lockout, cycleby-cycle current limit, slope compensation, softstart,
oscillator synchronization capability and thermal
shutdown. The controller is available in both VSSOP10 and WSON-10 packages.
Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
1VINSource Input VoltageInput to the start-up regulator. Input range is 13V to 100V.
2FBFeedback SignalInverting input of the internal error amplifier. The non-
inverting input is internally connected to a 1.25V reference.
3COMPThe output of the error amplifier and input to theCOMP pull-up is provided by an internal 5K resistor which
Pulse Width Modulatormay be used to bias an opto-coupler transistor.
4VCCOutput of the internal high voltage series passIf an auxiliary winding raises the voltage on this pin above
regulator. Regulated output voltage is 7.7Vthe regulation set point, the internal series pass regulator
will shut down, reducing the internal power dissipation.
5OUTOutput of the PWM controllerGate driver output with a 1A peak current capability.
6GNDGround return
7UVLOLine Under-Voltage ShutdownAn external resistor divider from the power converter
source voltage sets the shutdown levels. The threshold at
this pin is 1.25V. Hysteresis is set by a switched internal
20µA current source.
8CSCurrent Sense inputCurrent sense input for current mode control and over-
current protection. Current limiting is accomplished using a
dedicated current sense comparator. If the CS pin voltage
exceeds 0.5V the OUT pin switches low for cycle-by-cycle
current limiting. CS is held low for 50ns after OUT switches
high to blank leading edge current spikes.
9RT / SYNCOscillator timing resistor pin and synchronizationAn external resistor connected from RT to GND sets the
inputoscillator frequency. This pin also accepts synchronization
pulses from an external clock.
10SSSoftstart InputAn external capacitor and an internal 10µA current source
set the soft-start ramp rate.
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
VIN to GND-0.3V to 100V
VCC to GND-0.3V to 16V
RT to GND-0.3V to 5.5V
All other pins to GND-0.3V to 7V
Power DissipationInternally Limited
ESD Rating
(3)
Human Body Model2kV
Storage Temperature-65°C to +150°C
Junction Temperature150°C
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor.
Operating Ratings
VIN Voltage13V to 90V
External Voltage applied to VCC8V to 15V
Operating Junction Temperature-40°C to +125°C
Electrical Characteristics
Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full operating junction
temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, and RT = 31.6kΩ.
SymbolParameterConditionsMinTypMaxUnits
Startup Regulator
VCCRegVCCRegulationVCC= Open7.47.78.0V
VCCCurrent LimitSee
I-V
I
IN
IN
Startup Regulator LeakageVIN= 100V150500µA
Shutdown CurrentV
VCC Supply
VCCUVLO (Rising)VccRegVccReg -V
VCCUVLO (Falling)5.36.06.7V
I
CC
Supply CurrentCload = 023mA
Error Amplifier
GBWGain Bandwidth4MHz
DC Gain75dB
Reference VoltageFB = COMP1.2251.251.275V
COMP Sink CapabilityFB = 1.5V COMP= 1V517mA
UVLO Pin
Shutdown Threshold1.2251.251.275V
Undervoltage Shutdown Hysteresis162024µA
Current Source
Current Limit
ILIM Delay to OutputCS step from 0 to 0.6V30ns
Cycle by Cycle CS Threshold0.450.50.55V
Voltage
Leading Edge Blanking Time50ns
(2)
= 0V, VCC= open250350µA
UVLO
1522mA
- 300mV100mV
Time to onset of OUT
Transition (90%)
(1)
(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation using
Statistical Quality Control (SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL).
(2) Device thermal limitations may limit usable range.
Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full operating junction
temperature range. Unless otherwise specified: VIN = 48V, VCC = 10V, and RT = 31.6kΩ.
SymbolParameterConditionsMinTypMaxUnits
CS Sink Impedance (clocked)3555Ω
Soft Start
Softstart Current Source71013µA
Softstart to COMP Offset0.350.550.75V
Oscillator
Frequency1 (RT = 31.6k)See
Frequency2 (RT = 9.76k)See
Sync threshold2.43.23.8V
PWM Comparator
Delay to OutputCOMP set to 2V,25ns
Min Duty CycleCOMP=0V0%
Max Duty Cycle (-1 Device)758085%
Max Duty Cycle (-2 Device)50%
COMP to PWM Comparator Gain0.33
COMP Open Circuit Voltage4.35.26.1V
COMP Short Circuit CurrentCOMP=0V0.61.11.5mA
Slope Compensation
Slope Comp AmplitudeDelta increase at PWM80105130mV
(LM5020-1 Device Only)Comparator to CS
Output Section
Output High SaturationIout = 50mA, VCC- V
Output Low SaturationI
Rise TimeCload = 1nF18ns
Fall TimeCload = 1nF15ns
Thermal Shutdown
TsdThermal Shutdown Temp.165°C
Thermal Shutdown Hysteresis25°C
(3)
(3)
CS stepped 0 to 0.4V,
Time to onset of OUT
transition low
= 100mA, V
OUT
OUT
175200225kHz
560630700kHz
OUT
(1)
0.250.75V
0.250.75V
(3) Specification applies to the oscillator frequency. The operational frequency of the LM5020-2 devices is divided by two.
The LM5020 High Voltage PWM controller contains all of the features needed to implement single ended primary
power converter topologies. The LM5020 includes a high-voltage startup regulator that operates over a wide
input range to 100V. The PWM controller is designed for high speed capability including an oscillator frequency
range to 1MHz and total propagation delays less than 100ns. Additional features include an error amplifier,
precision reference, line under-voltage lockout, cycle-by-cycle current limit, slope compensation, softstart,
oscillator sync capability and thermal shutdown. The functional block diagram of the LM5020 is shown in Figure
1. The LM5020 is designed for current-mode control power converters, which require a single drive output, such
as Flyback and Forward topologies. The LM5020 provides all of the advantages of current-mode control
including line feed-forward, cycle-by-cycle current limiting and simplified loop compensation .
High Voltage Start-Up Regulator
The LM5020 contains an internal high voltage startup regulator, that allows the input pin (Vin) to be connected
directly to line voltages as high as 100V. The regulator output is internally current limited to 15mA. When power
is applied, the regulator is enabled and sources current into an external capacitor connected to the VCCpin. The
recommended capacitance range for the Vcc regulator is 0.1µF to 100µF. When the voltage on the VCCpin
reaches the regulation level of 7.7V, the controller output is enabled. The controller will remain enabled until V
falls below 6V.
In typical applications, a transformer auxiliary winding is connected through a diode to the VCCpin. This winding
should raise the VCCvoltage above 8V to shut off the internal startup regulator. Powering VCCfrom an auxiliary
winding improves conversion efficiency while reducing the power dissipated in the controller. The external V
capacitor must be selected such that the capacitor maintains the Vcc voltage greater than the VCCUVLO falling
threshold (6V) during the initial start-up. During a fault condition when the converter auxiliary winding is inactive,
external current draw on the VCCline should be limited such that the power dissipated in the start-up regulator
does not exceed the maximum power dissipation capability of the controller.
An external start-up or other bias rail can be used instead of the internal start-up regulator by connecting the V
and the Vin pins together and feeding the external bias voltage (8-15V) to the two pins.
CC
CC
CC
Line Under Voltage Detector
The LM5020 contains a line Under Voltage Lock Out (UVLO) circuit. An external set-point voltage divider from
Vin to GND sets the operational range of the converter. The resistor divider must be designed such that the
voltage at the UVLO pin is greater than 1.25V when Vin is in the desired operating range. If the under voltage
threshold is not met, all functions of the controller are disabled and the controller remains in a low power standby
state.
UVLO hysteresis is accomplished with an internal 20µA current source that is switched on or off into the
impedance of the set-point divider. When the UVLO threshold is exceeded, the current source is activated to
instantly raise the voltage at the UVLO pin. When the UVLO pin voltage falls below the 1.25V threshold the
current source is turned off, causing the voltage at the UVLO pin to fall. The UVLO pin can also be used to
implement a remote enable / disable function. If an external transistor pulls the UVLO pin below the 1.25V
threshold, the converter is disabled.
Error Amplifier
An internal high gain error amplifier is provided within the LM5020. The amplifier's non-inverting input is internally
set to a fixed reference voltage of 1.25V. The inverting input is connected to the FB pin. In non-isolated
applications, the power converter output is connected to the FB pin via voltage scaling resistors. Loop
compensation components are connected between the COMP and FB pins. For most isolated applications the
error amplifier function is implemented on the secondary side of the converter and the internal error amplifier is
not used. The internal error amplifier is configured as an open drain output and can be disabled by connecting
the FB pin to ground. An internal 5K pull-up resistor between a 5V reference and COMP can be used as the pullup for an optocoupler in isolated applications.
The LM5020 provides a cycle-by-cycle over current protection function. Current limit is accomplished by an
internal current sense comparator. If the voltage at the current sense comparator input exceeds 0.5V, the output
is immediately terminated. A small RC filter, located near the controller, is recommended to filter noise from the
current sense signal. The CS input has an internal MOSFET which discharges the CS pin capacitance at the
conclusion of every cycle. The discharge device remains on an additional 50ns after the beginning of the new
cycle to attenuate the leading edge spike on the current sense signal.
The LM5020 current sense and PWM comparators are very fast, and may respond to short duration noise
pulses. Layout considerations are critical for the current sense filter and sense resistor. The capacitor associated
with the CS filter must be located very close to the LM5020 and connected directly to the pins of the controller
(CS and GND). If a current sense transformer is used, both leads of the transformer secondary should be routed
to the sense resistor and the current sense filter network. A sense resistor located in the source of the primary
power MOSFET may be used for current sensing, but a low inductance resistor is required. When designing with
a current sense resistor all of the noise sensitive low power ground connections should be connected together
local to the controller and a single connection should be made to the high current power ground (sense resistor
ground point).
Oscillator and Sync Capability
A single external resistor connected between the RT and GND pins sets the LM5020 oscillator frequency.
Internal to the LM5020-2 device (50% duty cycle limited option) is an oscillator divide by two circuit. This divide
by two circuit creates an exact 50% duty cycle pulse which is used internally to create a precise 50% duty cycle
limit function. Because of this, the internal oscillator actually operates at twice the frequency of the output (OUT).
For the LM5020-1 device the oscillator frequency and the operational output frequency are the same. To set a
desired output operational frequency (F), the RT resistor can be calculated from:
LM5020-1:
(1)
LM5020-2:
(2)
The LM5020 can also be synchronized to an external clock. The external clock must have a higher frequency
than the free running oscillator frequency set by the RT resistor. The clock signal should be capacitively coupled
into the RT pin through a 100pF capacitor. A peak voltage level greater than 3.7 Volts at the RT pin is required
for detection of the sync pulse. The sync pulse width should be set between 15 to 150ns by the external
components. The RT resistor is always required, whether the oscillator is free running or externally synchronized.
The voltage at the RT pin is internally regulated at 2 Volts. The RT resistor should be located very close to the
device and connected directly to the pins of the controller (RT and GND).
PWM Comparator / Slope Compensation
The PWM comparator compares the current ramp signal with the loop error voltage derived from the error
amplifier output. The error amplifier output voltage at the COMP pin is offset by 1.4V and then further attenuated
by a 3:1 resistor divider. The PWM comparator polarity is such that 0 Volts on the COMP pin will result in a zero
duty cycle at the controller output. For duty cycles greater than 50 percent, current mode control circuits are
subject to sub-harmonic oscillation. By adding an additional fixed slope voltage ramp signal (slope compensation)
to the current sense signal, this oscillation can be avoided. The LM5020-1 integrates this slope compensation by
summing a current ramp generated by the oscillator with the current sense signal. Additional slope compensation
may be added by increasing the source impedance of the current sense signal. Since the LM5020-2 is not
capable of duty cycles greater than 50%, there is no slope compensation feature in this device.
The softstart feature allows the power converter to gradually reach the initial steady state operating point, thereby
reducing start-up stresses and current surges. At power on, after the VCCand the line undervoltage lockout
thresholds are satisfied, an internal 10µA current source charges an external capacitor connected to the SS pin.
The capacitor voltage will ramp up slowly and will limit the COMP pin voltage and the duty cycle of the output
pulses.
Gate Driver and Maximum Duty Cycle Limit
The LM5020 provides an internal gate driver (OUT), which can source and sink a peak current of 1 Amp. The
LM5020 is available in two duty cycle limit options. The maximum output duty cycle is typically 80% for the
LM5020-1 option and precisely equal to 50% for the LM5020-2 option. The maximum duty cycle function for the
LM5020-2 is accomplished with an internal toggle flip-flop which ensures an accurate duty cycle limit. The
internal oscillator frequency of the LM5020-2 is therefore twice the operating frequency of the PWM controller
(OUT pin).
The 80% maximum duty cycle limit of the LM5020-1 is determined by the internal oscillator and varies more than
the 50% limit of the LM5020-2. For the LM5020-1 the internal oscillator frequency and the operational frequency
of the PWM controller are equal.
Thermal Protection
Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction
temperature is exceeded. This feature prevents catastrophic failures from accidental device overheating. When
activated, typically at 165 degrees Celsius, the controller is forced into a low power standby state, disabling the
output driver and the bias regulator. After the temperature is reduced (typical hysteresis = 25°C) the V
regulator is enabled and a softstart sequence initiated.
CC
Typical Application Circuit: 36V - 75 VINand 3.3V, 4.5A OUT
LM5020MM-1ACTIVEVSSOPDGS101000TBDCall TICall TI-40 to 125SBLB
LM5020MM-1/NOPBACTIVEVSSOPDGS101000 Green (RoHS
& no Sb/Br)
CU SNLevel-1-260C-UNLIM -40 to 125SBLB
LM5020MM-2ACTIVEVSSOPDGS10TBDCall TICall TI-40 to 125SBNB
LM5020MM-2/NOPBACTIVEVSSOPDGS101000 Green (RoHS
& no Sb/Br)
CU SNLevel-1-260C-UNLIM -40 to 125SBNB
LM5020MMX-1ACTIVEVSSOPDGS10TBDCall TICall TI-40 to 125SBLB
LM5020MMX-1/NOPBACTIVEVSSOPDGS103500Green (RoHS
& no Sb/Br)
CU SNLevel-1-260C-UNLIM -40 to 125SBLB
LM5020MMX-2ACTIVEVSSOPDGS10TBDCall TICall TI-40 to 125SBNB
LM5020MMX-2/NOPBACTIVEVSSOPDGS103500Green (RoHS
& no Sb/Br)
CU SNLevel-1-260C-UNLIM -40 to 125SBNB
LM5020SD-1ACTIVEWSONDPR101000TBDCall TICall TI-40 to 1255020-1
LM5020SD-1/NOPBACTIVEWSONDPR101000 Green (RoHS
& no Sb/Br)
SNLevel-1-260C-UNLIM-40 to 1255020-1
LM5020SD-2/NOPBACTIVEWSONDPR101000 Green (RoHS
& no Sb/Br)
SNLevel-1-260C-UNLIM-40 to 1255020-2
LM5020SDX-1ACTIVEWSONDPR10TBDCall TICall TI-40 to 1255020-1
LM5020SDX-1/NOPBACTIVEWSONDPR104500 Green (RoHS
& no Sb/Br)
SNLevel-1-260C-UNLIM-40 to 1255020-1
LM5020SDX-2ACTIVEWSONDPR10TBDCall TICall TI-40 to 1255020-2
LM5020SDX-2/NOPBACTIVEWSONDPR104500 Green (RoHS
& no Sb/Br)
SNLevel-1-260C-UNLIM-40 to 1255020-2
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
PACKAGE OPTION ADDENDUM
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23-Sep-2013
Addendum-Page 2
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
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of the previous line and the two combined represent the entire Device Marking for that device.
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