有源钳位+单管正激的驱动

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L6598

February 2002 s HIGH VOLTAGE RAIL UP TO 600V s dV/dt IMMUNITY ±50V/ns IN FULL TEMPERATURE RANGE

s

DRIVER CURRENT CAPABILITY:250mA SOURCE 450mA SINK

s SWITCHING TIMES 80/40ns RISE/FALL WITH 1nF LOAD

s CMOS SHUT DOWN INPUT s UNDER VOLTAGE LOCK OUT

s SOFT START FREQUENCY SHIFTING TIMING

s SENSE OP AMP FOR CLOSED LOOP CONTROL OR PROTECTION FEATURES s HIGH ACCURACY CURRENT CONTROLLED OSCILLATOR

s INTEGRATED BOOTSTRAP DIODE s CLAMPING ON Vs

s

SO16, DIP16 PACKAGES

DESCRIPTION

The L6598 is manufactured with the BCD OFF LINE technology, able to ensure voltage ratings up to 600V, making it perfectly suited for AC/DC Adapters and wherever a Resonant Topology can be benefi-cial. The device is intended to drive two Power MOS,in the classical Half Bridge Topology. A dedicated Timing Section allows the designer to set Soft Start Time, Soft Start and Minimum Frequency. An Error Amplifier, together with the two Enable inputs, are made available. In addition, the integrated Bootstrap Diode and the Zener Clamping on low voltage sup-ply, reduces to a minimum the external parts needed in the applications.

DIP16SO16N

ORDERING NUMBERS:L6598

L6598D

HIGH VOLTAGE RESONANT CONTROLLER

BLOCK DIAGRAM

GND V REF

Ifmin

Rfmin

VCO

EN1

Vthe1

Vthe2

EN2

V S

V BOOT OUT C BOOT

LOAD

H.V.

LVG

UV

DETECTION

Vs

HVG

BOOTSTRAP DRIVER HVG DRIVER

LVG DRIVER

Css

V REF

Ifstart

Rfstart

Cf

OP AMP

+-OPOUT OPIN-OPIN+

DEAD TIME DRIVING LOGIC

CONTROL LOGIC

Iss

+

-+-LEVEL SHIFTER

D98IN887A

12

567

4

2

3

19

8

10

11

14

1516

L6598

2/16

PIN CONNECTION

THERMAL DATA

PIN FUNCTION

Symbol Parameter

SO16N DIP16Unit R th j-amb

Thermal Resistance Junction to Ambient

120

80

°C/W

Function

1C SS Soft Start Timing Capacitor

2R fstart Soft Start Frequency Setting - Low Impedance Voltage Source - See also C f 3C f Oscillator Frequency Setting - see also R fmin , R fstart

4R fmin Minimum Oscillation Frequency Setting - Low Impedance Voltage Source - See also C f 5OP out Sense OP AMP Output - Low Impedance 6OP on-Sense Op Amp Inverting Input - High Impedance 7OP on+Sense Op Amp Non Inverting Input - High Impedance 8EN1Half Bridge Latched Enable 9EN2Half Bridge Unlatched Enable 10GND Ground

11LVG Low Side Driver Output

12V s Supply Volatge with Internal Zener Clamp 13N.C.Not Connected

14OUT High Side Driver Reference 15HVG High Side Driver Output 16

V boot

Bootstrapped Supply Voltage

Css Rfstart

Cf Rfmin OPOUT OPIN+OPIN-1324567GND V S LVG N.C.OUT HVG VBOOT 16151413121011EN1

8

EN2

9

D98IN888