NSC LM5030MM, LM5030EVAL, LM5030MMX Datasheet

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 topolo­gies, 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 oper­ates over a wide input range of 14V to 100V. Additional
features include: error amplifier, precision reference, dual
mode current limit, slope compensation, softstart, sync ca­pability 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 (Contact factory for thermally enhanced
LLP availability).

Features

n Internal High Voltage Start-up Regulator
n Single Resistor Oscillator Setting
n Synchronizable
n Error Amplifier
n Precision Reference
n Adjustable Softstart
n Dual Mode Over-Current Protection
n Slope Compensation
n Direct Optocoupler Interface
n 1.5A Peak Gate Drivers
n Thermal Shutdown

Applications

n Telecommunication Power Converters
n Industrial Power Converters
n +42V Automotive Systems

Connection Diagram

Top View

20058112

10-Lead MSOP

Ordering Information

Order Number Package Marking NSC Package Drawing Supplies As

LM5030MM S73B MUB10A 1000 Units on Tape and Reel

LM5030MMX S73B MUB10A 3500 Units on Tape and Reel

August 2003

LM5030 100V Push-Pull Current Mode PWM Controller

© 2003 National Semiconductor Corporation DS200581 www.national.com

Block Diagram

20058101

FIGURE 1.

LM5030

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Pin Description

Pin Name Pin

Number

Description Application Information

V

IN

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

V

FB

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.

LM5030

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

V

IN

to GND (Survival) -0.3V to 100V

V

CC

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

V

IN

14V to 90V

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: V

IN

= 48V, VCC= 10V, and RT = 26.7KΩ

Symbol Parameter Conditions Min

(Note 4)

Typ

(Note 5)

Max

(Note 4)

Units

Startup Regulator

V

CC

Reg VCCRegulation open ckt 7.4 7.7 8.0 V

V

CC

Current Limit (Note 2) 10 17 mA

I-V

IN

Startup Regulator Leakage
(external Vcc Supply)

VIN= 90V 150 500 µA

I

IN

Shutdown Current SS = 0V, VCC= open 250 350 µA

V

CC

Supply

V

CC

undervoltage Lockout

Voltage

VccReg

- 300mV

VccReg -

100mV

V

Undervoltage Hysteresis 1.2 1.6 2.1 V

I

CC

Supply Current Cload = 0 2 3 mA

Error Amplifier

GBW Gain Bandwidth 4 MHz

DC Gain 75 dB

Input Voltage V

FB

= COMP 1.220 1.245 1.270 V

COMP Sink Capability V

FB

= 1.5V COMP= 1V 5 13 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 3 6mA

Soft Start/Shutdown

Softstart Current Source 7 10 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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