STMicroelectronics L6598 Technical data

L6598

Fi

HIGH VOLTAGE RESONANT CONTROLLER

1 FEATURES

■ HIGH VOLTAGE RAIL UP TO 600V

■ dV/dt IMMUNITY ±50V/ns IN FULL

TEMPERATURE RANGE

■ DRIVER CURRENT CAPABILITY:

250mA SOURCE
450mA SINK

■ SWITCHING TIMES 80/40ns RISE/FALL WITH

1nF LOAD

■ CMOS SHUT DOWN INPUT

■ UNDER VOLTAGE LOCK OUT

■ SOFT START FREQUENCY SHIFTING

TIMING

■ SENSE OP AMP FOR CLOSED LOOP

CONTROL OR PROTECTION FEATURES

■ HIGH ACCURACY CURRENT CONTROLLED

OSCILLATOR

■ INTEGRATED BOOTSTRAP DIODE

■ CLAMPING ON Vs

■ SO16, DIP16 PACKAGES

2 DESCRIPTION

The device is manufactured with the BCD OFF LINE

gure 1. Packages

DIP-16

SO-16N

Table 1. Order Codes

Part Number Package

L6598 DIP-16

L6598D SO-16N

L6598D013TR Tape & Reel

technology, able to ensure voltage ratings up to
600V, making it perfectly suited for AC/DC Adapters
and wherever a Resonant Topology can be benefi­cial. The device is intended to drive two P ower 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 sup­ply, reduces to a minimum the external parts needed
in the applications.

Figure 2. Block Diagram

OP AMP

Ifmin

Ifstart

VCO

+

-

V

REF

V

REF

OPOUT

OPIN-

OPIN+

Rfmin

Rfstart

Cf

June 2004

5

6
7

4

2

3

CONTROL

LOGIC

V

S

12

UV

DETECTION

DEAD

TIME

Iss

BOOTSTRAP

1

Css

DRIVER

DRIVING

LOGIC

HVG

DRIVER

LEVEL

SHIFTER

LVG DRIVER

+

-

+

-

Vthe1

Vthe2

D98IN887A

16

15

14

Vs

11

10

8

9

V

HVG

OUT

LVG

GND

EN1

EN2

BOOT

H.V.

C

BOOT

LOAD

1/17

L6598

Figure 3. Pin Connection

Css

Rfstart

Cf

Rfmin

OPOUT

OPIN-

OPIN+

1
2
3
4
5
6
7 GND

15
14
13
12
11
10

VBOOT16
HVG
OUT
N.C.
V

S

LVG

EN1 8 EN29

D98IN888

Table 2. Thermal Data

Symbol Parameter SO16N DIP16 Unit

R

th j-amb

Thermal Resistance Junction to Ambient 120 80 °C/W

Table 3. Pin Function

N. Name Function

1CSSSoft Start Timing Capacitor
2R
3CfOscillator Frequency Setting - see also R
4R
5OP
6OP
7OP
8 EN1 Half Bridge Latch ed En able

9 EN2 Half Bridge Unlatched Enable
10 GND Ground
11 LVG Low Side Driver Output
12 V
13 N.C. Not Connected
14 OUT High Side Driver Reference
15 HVG High Side Driver Output
16 V

Soft Start Frequency Setting - Low Impedance Voltage Source - See also C

fstart

, R

fmin

fstart

Minimum Oscillation Frequency Setting - Low Impedance Voltage Source - See also C

fmin

Sense OP AMP Output - Low Impedance

out

Sense Op Amp Inverting Input - High Impedance

on-

Sense Op Amp Non Inverting Input - High Impedance

on+

Supply Volatge with Internal Zener Clamp

s

Bootstrapped Supply Voltage

boot

f

f

2/17

Table 4. Absolute Maximum Ratings

Symbol Parameter Value Unit

L6598

V

dV

dV

EN1

I

EN1

I

S

V

LVG

V

OUT

V

HVG

V

BOOT

BOOT/dt

OUT/dt

V

ir

V

ic

, V
, I

V

opc

V

opd

V

opo

T

stg

Supply Current at Vcl (*) 25 mA
Low Side Output 14.6 V
High Side Reference -1 to V
High Side Output -1 to V

-18 V

BOOT

BOOT

Floating Supply Voltage 618 V
VBOOT pin Slew Rate (repetitive) ±50 V/ns
OUT pin Slew Rate (repetitive) ±50 V/ns
Forced Input Voltage (pins Rfmin, Rfstart) -0.3 to 5 V
Forced Input Volatge (pins Css, Cf) -0.3 to 5 V
Enable Input Voltage -0.3 to 5 V

EN2

Enable Input Current ±3 mA

EN2

Sense Op Amp Common Mode Range -0.3 to 5 V
Sense Op Amp Differential Mode Range -5 to 5 V
Sense Op Amp Output Voltage (forced) 4.6 V
Storage Temperature -40 to +150 °C

V

T

T

amb

(*) The device is provided of an internal Clamping Zener between GND and the Vs pin, It must not be supplied by a low impedance voltage

source.

Note : ESD immunity for pins 14, 15 and 16 is guaranteed up to 900 (Human Body Model).

Junction Temperature -40 to +150 °C

j

Ambient Temperature -40 to +1 25 °C

Table 5. Recommended Operating Conditions

Symbol Parameter Value Unit

V

S

V

out

V

boot

f

max

(*) If the condition Vboot - Vout < 18 is guaranteed, Vo ut can range from -3 to 580V.

Supply Voltage 10 to V

(*) High Side Reference -1 to Vboot-V

(*) Floating Supply Rail 500 V

Maximum Switching Frequency 400 kHz

cl

cl

V
V

3/17

L6598

Table 6. Electrical Characteristcs

= 12V; V

(V

S

Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
SUPPLY VOLTAGE

V

suvp

V

suvn

V

suvh

V

cl

I

su

I

q

HIGH VOLTAGE SECTION

I

bootleak

I

outleak

R

don

HIGH/LOW SIDE DRIVERS

I

hvgso

I

hvgsi

I

lvgso

I

lvgsi

t

rise

t

15,11 Low/High Side Output Rise

fall

OSCILLATOR

DC 14 Output Duty Cycle 48 50 52 %

f

min

f

start

V

t

2, 4 Voltage to Current Converters

ref

d

TIMING SECTION

k

ss

SENSE OP AMP

6, 7 Input Bias Current 0.1 µA

io

ic

V

R

I

I

out+

V

l

IB

out

out-

BOOT

- V

OUT

= 12V; T

amb

= 25°C)

12 VS Turn On Threshold 10 10.7 11.4 V

VS Turn Off Threshold 7.3 8 8.7 V
Supply Voltage Under Voltage

2.7 V

hysteresis
Supply Voltage Clamping 14.6 15.6 16.6 V
Start Up Current Vs < V
Quiescent Current, fout =

Vs > V

suvn
suvp

23mA

250 µA

60kHz, no load

16 BOOT pin Leakage Current V
14 OUT pin Leakage Current V

= 580V 5 µA

BOOT

= 562V 5 µA

OUT

16 Bootstrap Driver On Resistance 100 150 300 Ω

15 High Side Driver Source Current V

High Side Driver Sink Current V

11 Low Side Driver Source Current V

Low Side Driver Sink Current V

HVG-VOUT
HVG-VBOOT
LVG-GND
LVG - VS

C

load

= 0 170 250 mA

= 0 300 450 mA

= 0 170 250 mA

= 0 300 450 mA

= 1nF 80 120 ns

Time

C

= 1nF 40 80 ns

load

Minimum Output Oscilla tio n

Cf = 470pF; R

= 50k 58.2 60 61.8 kHz

fmin

Frequency
Soft Start Ou tpu t Osc illa tio n

Frequency

Cf = 470pF; R
R

= 47k

fstart

fmin

= 50k;

114 120 126 kHz

1.922.1V

Threshold

14 Dead Time between Low and

0.2 0.27 0.35 µs

High Side Conduction

1 Soft Start Timing consta nt Css = 330nF 0.115 0.15 0.185 s/µF

Input Offset Voltage -10 10 mV

5 Output Re sis tan ce 200 300 Ω

Source Output Current V
Sink Output Current V

6,7 OP AMP input common mode

= 4.5V 1 mA

out

= 0.2V 1 mA

out

-0.2 3 V

range

4/17

L6598

9

Table 6. Electrical Characteristcs (continued)
(V

= 12V; V

S

Symbol Pin Parameter Test Condition Min. Typ. Max. Unit

GBW Sense Op Amp Gain Band

G

dc

COMPARATORS

V

the1

V

the2

t

pulse

(*) Guaranted by design

Figure 4. EN2 Timing Diagrams

BOOT

- V

OUT

= 12V; T

amb

= 25°C)

0.5 1 MHz

Width Product (*)
DC Open Loop Gain 60 80 dB

8 Enabling Comparator Threshold 0.56 0.6 0.64 V
9 Enabling Comparator Threshold 1.05 1.2 1.35 V

8,9 Minimum Pulse lenght 200 ns

V

S

f

OUT

f

start

f

min

EN2

V

Css

Figure 5. EN1 Timing Diagrams

HVG

LVG

EN1

EN2

T

SS

T

SS

D98IN88

D98IN890

5/17

L6598

Figure 6. Oscillator/Output Timing Diagram

C

f

HVG

LVG

D98IN897

3 BLOCK’S DIAGRAM DESCRIPTION

3.1 High/Low Side driving section

An High and Low Side driving Section provide the proper driving to the external Power MOS or IGBT. An high
sink/source driving current (450 /250 mA typ) ensure fast switc hing times also when size 4 Power MOS are used.
The internal logic ensures a minimum dead time to avoid cross-conduction of the power devices.

3.2 Timing and Oscillator Section

The device is provided of a soft start function. It consists in a period of time, TSS, in which the switching frequen­cy shifts from f

start

to f

. This feature is explained in the following description (ref. fig.7 and fig.8).

min

Figure 7. Soft Start and frequency shifting block

Iss

IfminIfstart

Iosc

gm OSC

Css

6/17