LM5030MMX - National Semiconductor

LM5030

LM5030 100V Push-Pull Current Mode PWM Controller

Literature Number: SNVS215B

LM5030

100V Push-Pull Current Mode PWM Controller

General Description

The LM5030 High Voltage PWM controller contains all of the

features needed to implement Push-Pull and Bridge topolo-

gies, using current-mode control in a small 10 pin package.

This device provides two alternating gate driver outputs. The

LM5030 includes a high-voltage start-up regulator that oper-

ates over a wide input range of 14V to 100V. Additional

features include: error amplifier, precision reference, dual

mode current limit, slope compensation, softstart, sync ca-

pability and thermal shutdown. This high speed IC has total

propagation delays less than 100ns and a 1MHz capable

single resistor adjustable oscillator.

Package: MSOP-10 and thermally enhanced LLP-10 (4mm

x 4mm).

Features

nInternal High Voltage Start-up Regulator

nSingle Resistor Oscillator Setting

nSynchronizable

nError Amplifier

nPrecision Reference

nAdjustable Softstart

nDual Mode Over-Current Protection

nSlope Compensation

nDirect Optocoupler Interface

n1.5A Peak Gate Drivers

nThermal Shutdown

Applications

nTelecommunication Power Converters

nIndustrial Power Converters

n+42V Automotive Systems

Connection Diagram

Top View

20058112

10-Lead MSOP, LLP

Ordering Information

Order Number Package Type NSC Package Drawing Supplies As

LM5030MM MSOP-10 MUB10A 1000 Units on Tape and Reel

LM5030MMX MSOP-10 MUB10A 3500 Units on Tape and Reel

LM5030SD LLP-10 SDC10A 1000 Units on Tape and Reel

LM5030SDX LLP-10 SDC10A 4500 Units on Tape and Reel

March 2005

LM5030 100V Push-Pull Current Mode PWM Controller

Block Diagram

20058101

FIGURE 1.

LM5030

www.national.com 2

Pin Description

Pin Name Pin

Number

Description Application Information

1 Source Input Voltage Input to start-up regulator. Input range 14 to 100 Volts.

2 Inverting input to the error amplifier The non-inverting input is internally connected to a 1.25 Volt

reference.

COMP 3 Output to the error amplifier There is an internal 5K resistor pull-up on this pin. The error

amplifier provides an active sink.

Vcc 4 Output from the internal high

voltage series pass regulator. The

regulation setpoint is 7.7 Volts.

If an auxiliary winding raises the voltage on this pin above the

regulation setpoint the internal series pass regulator will

shutdown, reducing the IC power dissipation.

OUT1 5 Output of the PWM controller Alternating PWM output gate driver.

OUT2 6 Output of the PWM controller Alternating PWM output gate driver.

GND 7 Return Ground

CS 8 Current sense input Current sense input for current mode control and current limit

sensing. Using separate dedicated comparators, if CS exceeds

0.5 Volt the outputs will go into Cycle by Cycle current limit. If CS

exceeds 0.625V the outputs will be disabled and a softstart

commenced.

RT 9 Oscillator timing resistor pin and

synchronization input.

An external resistor sets the oscillator frequency. This pin will

also accept synchronization pulses from an external oscillator.

SS 10 Dual purpose Softstart and

Shutdown pin

A 10µA current source and an external capacitor set the softstart

timing length. The controller will enter a low power state if the SS

pin is pulled below the typical shutdown threshold of 0.45V.

LLP

DAP

SUB Die Substrtae The exposed die attach pad on the LLP package should be

connected to a PCB thermal pad at ground potential. For

additional information on using National Semiconductor’s No Pull

Back LLP package, please refer to LLP Application Note

AN-1187.

LM5030

www.national.com3

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

to GND (Survival) -0.3V to 100V

to GND (Survival) -0.3V to 16V

RT to GND (Survival) -0.3V to 5.5V

All other pins to GND (Survival) -0.3V to 7V

Power Dissipation (Note 2) Internally Limited

ESD Rating (Note 3)

Human Body Model

Machine Model

2kV

200V

Lead Temperature

(Soldering 4 seconds) 260˚C

Storage Temperature Range -55˚C to +150˚C

Junction Temperature 150˚C

Operating Ratings

Junction Temperature -40˚C to +105˚C

14V to 90V

Electrical Characteristics

Specifications in standard type face are for T

= +25˚C and those in boldface type apply over the full operating junction tem-

perature range. Unless otherwise specified: V

= 48V, V

= 10V, and RT = 26.7KΩ

Symbol Parameter Conditions Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

Startup Regulator

Reg V

Regulation open ckt 7.4 7.7 8.0 V

Current Limit (Note 2) 10 17 mA

I-V

Startup Regulator Leakage

(external Vcc Supply)

= 90V 150 500 µA

Shutdown Current SS = 0V, V

= open 250 350 µA

Supply

undervoltage Lockout

Voltage

VccReg

- 300mV

VccReg -

100mV

Undervoltage Hysteresis 1.2 1.6 2.1 V

Supply Current Cload = 0 2 3mA

Error Amplifier

GBW Gain Bandwidth 4 MHz

DC Gain 75 dB

Input Voltage V

= COMP 1.220 1.245 1.270 V

COMP Sink Capability V

= 1.5V COMP= 1V 513 mA

Current Limit

CS1 Cycle by Cycle CS Threshold

Voltage

0.45 0.5 0.55 V

CS2 Restart CS Threshold Voltage Resets SS capacitor; auto

restart

0.575 0.625 0.675 V

ILIM Delay to Output CS step from 0 to 0.6V

Time to onset of OUT

Transition (90%)

Cload = 0

30 ns

CS Sink Current (clocked) CS = 0.3V 36mA

Soft Start/Shutdown

Softstart Current Source 710 13 µA

Softstart to COMP Offset 0.25 0.5 0.75 V

Shutdown Threshold 0.2 0.45 0.7 V

LM5030

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Electrical Characteristics (Continued)

Specifications in standard type face are for T

= +25˚C and those in boldface type apply over the full operating junction tem-

perature range. Unless otherwise specified: V

= 48V, V

= 10V, and RT = 26.7KΩ

Symbol Parameter Conditions Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

Oscillator

Frequency1 (RT = 26.7K) 175 200 225 kHz

Frequency2 (RT = 8.2K) 510 600 690 kHz

Sync threshold 3.2 3.8 V

PWM Comparator

Delay to Output COMP set to 2V CS

stepped 0 to 0.4V, Time

to onset of OUT transition

low

30 ns

Max Duty Cycle Inferred from deadtime 47.5 49 50 %

Min Duty Cycle COMP=0V 0%

COMP to PWM Comparator

Gain

0.34

COMP Open Circuit Voltage V

=0V 4.3 5.2 6.1 V

COMP Short Circuit Current V

= 0V, COMP=0V 0.6 1.1 1.5 mA

Slope Compensation

Slope Comp Amplitude Delta increase at PWM

Comparator to CS

80 105 130 mV

Output Section

Deadtime Cload = 0, 10% to 10% 85 135 185 ns

Output High Saturation Iout = 50mA, V

-V

OUT

0.25 0.75 V

Output Low Saturation I

OUT

= 100mA 0.25 0.75 V

Rise Time Cload = 1nF 16 ns

Fall Time Cload = 1nF 16 ns

Thermal Shutdown

Tsd Thermal Shutdown Temp. 165 ˚C

Thermal Shutdown Hysteresis 15 ˚C

Note 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 guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJA, and

the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:

Where the value of θJA for the mini SO-10 (MM) package is 200˚C/W. Exceeding the maximum allowable dissipation will cause excessive die temperature, and the

device will go into thermal shutdown.

Note 3: The human body model is a 100pF capacitor discharged through a 1.5kΩresistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin. The machine model ESD rating for pin 5 and pin 6 is 150V.

Note 4: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control

(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).

Note 5: Typical numbers represent the most likely parametric norm for 25˚C operation.

LM5030

www.national.com5

Typical Performance Characteristics Unless otherwise specified: T

= 25˚C.

vs V

vs I

= 48V)

20058105 20058107

Oscillator Frequency vs RT

Oscillator Frequency vs Temperature

RT = 26.7kΩ

20058108 20058109

Soft Start Current vs Temperature Deadtime vs Temperature

20058110 20058111

LM5030

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Typical Performance Characteristics Unless otherwise specified: T

= 25˚C. (Continued)

Feedback Amplifier Gainphase

20058115

Detailed Operating Description

The LM5030 High Voltage PWM controller contains all of the

features needed to implement Push-Pull and Bridge topolo-

gies, using current-mode control in a small 10 pin package.

Features included are, startup regulator, dual mode current

limit, dual alternating gate drivers, thermal shutdown, soft-

start and slope compensation. This high speed IC has total

propagation delays <100nS. The Functional Block Diagram

of the LM5030 is shown in Figure 1.

The LM5030 is designed for Current-Mode Control convert-

ers which require alternating outputs, such as Push-Pull and

Half/Full Bridge topologies. The features included in the

LM5030 enable all of the advantages of Current-Mode Con-

trol, line feed-forward, cycle by cycle current limit and sim-

plified loop compensation. The oscillator ramp is internally

buffered and added to the PWM comparator input to provide

slope compensation necessary for current mode control at

higher duty cycles.

High Voltage Start-Up Regulator

The LM5030 contains an internal high voltage startup regu-

lator. The input pin (Vin) can be connected directly to line

voltages as high as 100V. The regulator output is internally

current limited to 10mA. Upon power up, the regulator is

enabled and sources current into an external capacitor con-

nected to the V

pin. The recommended capacitance range

for the V

regulator is 0.1µF to 50µF. When the voltage on

the V

pin reaches the regulation point of 7.7V, the control-

ler outputs are enabled. The outputs will remain enabled

unless, V

falls below 6.1V or if the SS/SHUTDOWN pin is

pulled to ground or an over temperature condition occurs. In

typical applications, an auxiliary transformer winding is diode

connected to the V

pin. This winding raises the V

voltage greater than 8V, effectively shutting off the internal

startup regulator and saving power while reducing the con-

troller dissipation. The external V

capacitor must be sized

such that the self-bias will maintain a V

voltage greater

than 6.1V during the initial start-up. During a fault mode

when the converter self bias winding is inactive, external

current draw on the V

line should be limited as to not

exceed the maximum power dissipation 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 and feeding the external bias voltage (8 - 15V) to that

node.

Error Amplifier

An internal high gain error amplifier is provided within the

LM5030. The amplifier’s non-inverting reference is tied to

1.25V. In non-isolated applications the power converter out-

put is connected to the VFB pin via the voltage setting

resistors and loop compensation is connected between the

COMP and VFB pins.

For most isolated applications the error amplifier function is

implemented on the secondary side ground. Since the inter-

nal error amplifier is configured as an open drain output it

can be disabled by connecting VFB to ground. The internal

5K pull-up resistor, connected between the 5V reference and

COMP, can be used as the pull-up for an optocoupler or

other isolation device.

PWM Comparator

The PWM comparator compares the compensated current

ramp signal to the loop error voltage from the internal error

amplifier (COMP pin). This comparator is optimized for

speed in order to achieve minimum discernable duty cycles.

The comparator polarity is such that zero Volts on the COMP

pin will cause a zero duty cycle.

Current Limit/ Current Sense

The LM5030 contains two levels of over-current protection. If

the voltage on the current sense comparator exceeds 0.5

Volts the present cycle is terminated (cycle by cycle current

limit). If the voltage on the current sense comparator ex-

ceeds 0.625 Volts, the controller will terminate the present

cycle and discharge the softstart capacitor. A small RC filter,

located near the controller, is recommended for the CS pin.

An internal MOSFET discharges the current sense filter

capacitor at the conclusion of every cycle, to improve dy-

namic performance.

The LM5030 CS and PWM comparators are very fast, and

as such will 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 placed very close to the device and connected

directly to the pins of the IC (CS and RTN). Also if a current

sense transformer is used, both leads of the transformer

secondary should be routed to the sense resistor, which

should also be located close to the IC. If a current sense

resistor located in the drive transistor sources is used, for

current sense, a low inductance resistor should be chosen.

LM5030

www.national.com7

Current Limit/ Current Sense

(Continued)

In this case all of the noise sensitive low power grounds

should be commoned together around the IC and then a

single connection should be made to the power ground

(sense resistor ground point).

The second level threshold is intended to protect the power

converter by initiating a low duty cycle hiccup mode when

abnormally high, fast rising currents occur. During excessive

loading, the first level threshold will always be reached and

the output characteristic of the converter will be that of a

current source but this sustained current level can cause

excessive temperatures in the power train especially the

output rectifiers. If the second level threshold is reached, the

softstart capacitor will be fully discharged, a retry will com-

mence following the discharge detection. The second level

threshold will only be reached when a high dV/dt is present

at the current sense pin. The signal must be fast enough to

reach the second level threshold before the first threshold

detector turns off the driver. This can usually happen for a

saturated power inductor or shorted load. Excessive filtering

on the CS pin, extremely low value current sense resistor or

an inductor that does not saturate with excessive loading

may prevent the second level threshold from ever being

reached.

Oscillator, Shutdown and Sync

Capability

The LM5030 oscillator is set by a single external resistor

connected between the RT pin and return. To set a desired

oscillator frequency the necessary RT resistor can be calcu-

lated as:

Each output switches at half the oscillator frequency in a

Push-Pull configuration. The LM5030 can also be synchro-

nized to an external clock. The external clock must be of

higher frequency than the free running frequency set by the

RT resistor. The clock signal should be capacitively coupled

into the RT pin with a 100pF capacitor. A peak voltage level

greater than 3 Volts with respect to ground is required for

detection of the sync pulse. The sync pulse width should be

set in the 15 to 150nS range 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 to a nominal 2 Volts.

The RT resistor should be located very close to the device

and connected directly to the pins of the IC (RT and GND).

Slope Compensation

The PWM comparator compares the current sense signal to

the voltage derived from the COMP pin. The COMP voltage

is set by either the internal error amplifier or an external error

amplifier through an optocoupler. At duty cycles greater than

50% (composite of alternating outputs) current mode control

circuits are prone to subharmonic oscillation. By adding an

additional ramp signal to the current sense ramp signal this

condition can be avoided. The LM5030 integrates this slope

compensation by buffering the internal oscillator ramp and

summing it internally to the current sense (CS) signal. Addi-

tional slope compensation may be added by increasing the

source impedance of the current sense signal.

Soft Start/ Shutdown

The softstart feature allows the converter to gradually reach

the initial steady state operating point, thus reducing start-up

stresses and surges. An internal 10uA current source and an

external capacitor generate a ramping voltage signal which

limits the error amplifier output during start-up. In the event

of a second level current limit fault, the softstart capacitor will

be fully discharged which disables the output drivers. When

the fault condition is no longer present, the softstart capaci-

tor is released to ramp and gradually restart the converter.

The SS pin can also be used to disable the controller. If the

SS pin voltage is pulled down below 0.45V (nominal) the

controller will disable the outputs and enter a low power

state.

OUT1, OUT2 and Time Delay

The LM5030 provides two alternating outputs, OUT1 and

OUT2. The internal gate drivers can each sink 1.5A peak

each. The maximum duty cycle for each output is inherently

limited to less than 50%. The typical deadtime between the

falling edge of one gate driver output and the rising edge of

the other gate driver output is 135ns.

Thermal Protection

Internal Thermal Shutdown circuitry is provided to protect the

integrated circuit in the event the excessive junction tem-

perature. When activated, typically at 165 degrees Celsius,

the controller is forced into a low power reset state, disabling

the output drivers and the bias regulator. This feature is

provided to prevent catastrophic failures from accidental

device overheating.

LM5030

www.national.com 8

Typical Application Circuit

Typical Application Circuit, 36V - 75VIN and 3.3V, 10A OUT

20058103

LM5030

www.national.com9

ITEM PART NUMBER DESCRIPTION VALUE

C 1 C0805C472K5RAC Capacitor, CER, KEMET 4700p, 50V

C 2 C0805C103K5RAC Capacitor, CER, KEMET 0.01µ, 50V

C 3 C4532X7S0G686M Capacitor, CER, TDK 68µ, 4V

C 4 T520D337M006AS4350 Capacitor, TANT, KEMET 330µ, 6.3V

C 5 T520D337M006AS4350 Capacitor, TANT, KEMET 330µ, 6.3V

C 6 C4532X7R3A103K Capacitor, CER, TDK 0.01µ, 1000V

C 7 C3216X7R2A104K Capacitor, CER, TDK 0.1µ, 100V

C 8 C4532X7R2A105M Capacitor, CER, TDK 1µ, 100V

C 9 C4532X7R2A105M Capacitor, CER, TDK 1µ, 100V

C 10 C0805C102K1RAC Capacitor, CER, KEMET 1000p, 100V

C 11 C1206C223K5RAC Capacitor, CER, KEMET 0.022µ, 50V

C 12 C3216X7R1E105M Capacitor, CER, TDK 1µ, 25V

C 13 C3216COG2J221J Capacitor, CER, TDK 220p, 630V

C 14 C3216COG2J221J Capacitor, CER, TDK 220p, 630V

C 15 C1206C104K5RAC Capacitor, CER, KEMET 0.1µ, 50V

C 16 C0805C101J1GAC Capacitor, CER, KEMET 100p, 100V

C 17 C0805C101J1GAC Capacitor, CER, KEMET 100p, 100V

C 18 C3216X7R1H334K Capacitor, CER, TDK 0.33µ, 50µ

D 1 MBRB3030CTL Diode, Schottky, ON

D 2 CMPD2838-NSA Diode, Signal, Central

D 3 CMPD2838-NSA Diode, Signal, Central

D 4 CMPD2838-NSA Diode, Signal, Central

D 5 CMPD2838-NSA Diode, Signal, Central

L 1 MSS6132-103 Input Choke, Coilcraft 10µH, 1.5A

L 2 A9785-B Output Choke, Coilcraft 7µH

R 1 CRCW12061R00F Resistor 1

R 2 CRCW12064990F Resistor 499

R 3 CRCW2512101J Resistor 100, 1W

R 4 CRCW2512101J Resistor 100, 1W

R 5 CRCW12064022F Resistor 40.2K

R 6 CRCW120610R0F Resistor 10

R 7 CRCW120610R0F Resistor 10

R 8 CRCW12061002F Resistor 10K

R 9 CRCW120623R7F Resistor 23.7

R 10 CRCW12062002F Resistor 20K

R 11 CRCW120610R0F Resistor 10

R 12 CRCW12063010F Resistor 301

R 13 CRCW120610R0F Resistor 10

R 14 CRCW12061001F Resistor 1K

TX 1 A9784-B POWER XFR, COILCRAFT

TX 2 P8208T CURRENT XFR, Pulse 100:1

U1 1 LM5030 REGULATOR, NATIONAL

U2 2 MOCD207M OPTO-COUPLER, QT

OPTOELECTRONICS

U3 3 LM3411AM5-3.3 REFERENCE, NATIONAL

651-1727010 DUAL TERMINALS, MOUSER 3 per ASSY

X 1 SUD19N20-90 FET, N, 200V, SILICONIX

X 2 SUD19N20-90 FET, N, 200V, SILICONIX

LM5030

www.national.com 10

Physical Dimensions inches (millimeters)

unless otherwise noted

10 Lead MSOP Package

NS Package Number MUB10A

10 Lead LLP Package

NS Package Number SDC10A

LM5030

www.national.com11

Notes

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves

the right at any time without notice to change said circuitry and specifications.

For the most current product information visit us at www.national.com.

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS

WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body, or

(b) support or sustain life, and whose failure to perform when

properly used in accordance with instructions for use

provided in the labeling, can be reasonably expected to result

in a significant injury to the user.

2. A critical component is any component of a life support

device or system whose failure to perform can be reasonably

expected to cause the failure of the life support device or

system, or to affect its safety or effectiveness.

BANNED SUBSTANCE COMPLIANCE

National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products

Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain

no ‘‘Banned Substances’’ as defined in CSP-9-111S2.

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www.national.com

LM5030 100V Push-Pull Current Mode PWM Controller

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