ST L6598 User Manual
1/16
L6598
February 2000
■
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
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.
DIP16 SO16N
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
5
6
7
4
2
3
1
9
8
10
11
14
15
16
查询L6598供应商
L6598
2/16
PIN CONNECTION
THERMAL DATA
PIN FUNCTION
Symbol Parameter SO16N DIP16 Unit
R
th j-amb
Thermal Resistance Junction to Ambient 120 80 °C/W
N. Name Function
1C
SS
Soft Start Timing Capacitor
2R
fstart
Soft Start Frequency Setting - Low Impedance VoltageSource - See also C
f
3C
f
Oscillator Frequency Setting - see also R
fmin
,R
fstart
4R
fmin
Minimum Oscillation Frequency Setting - Low Impedance VoltageSource - 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
8 EN1 Half Bridge Latched Enable
9 EN2 Half Bridge Unlatched Enable
10 GND Ground
11 LVG Low Side Driver Output
12 V
s
Supply Volatge with Internal Zener Clamp
13 N.C. Not Connected
14 OUT High Side Driver Reference
15 HVG High Side Driver Output
16 V
boot
Bootstrapped Supply Voltage
Css
Rfstart
Cf
Rfmin
OPOUT
OPIN+
OPIN-
1
3
2
4
5
6
7 GND
V
S
LVG
N.C.
OUT
HVG
VBOOT16
15
14
13
12
10
11
EN1 8 EN29
D98IN888
3/16
L6598
ABSOLUTEMAXIMUM RATINGS
(*) 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).
RECOMMENDED OPERATINGCONDITIONS
(*) If the condition Vboot - Vout < 18 is guaranteed, Vout can range from -3 to 580V.
Symbol Parameter Value Unit
I
S
Supply Current at V
cl
(*) 25 mA
V
LVG
Low Side Output 14.6 V
V
OUT
High Side Reference -1 to V
BOOT
-18 V
V
HVG
High Side Output -1 to V
BOOT
V
V
BOOT
Floating Supply Voltage 618 V
dV
BOOT/dt
VBOOT pin Slew Rate (repetitive) ±50 V/ns
dV
OUT/dt
OUT pin Slew Rate (repetitive) ±50 V/ns
V
ir
Forced Input Voltage (pins Rfmin, Rfstart) -0.3 to 5 V
V
ic
Forced Input Volatge (pins Css, Cf) -0.3 to 5 V
V
EN1
,V
EN2
Enable Input Voltage -0.3 to 5 V
I
EN1
,I
EN2
Enable Input Current ±3mA
V
opc
Sense Op Amp Common Mode Range -0.3 to 5 V
V
opd
Sense Op Amp Differential Mode Range -5 to5 V
V
opo
Sense Op Amp Output Voltage (forced) 4.6 V
T
stg
Storage Temperature -40 to +150 °C
T
j
Junction Temperature -40 to +150 °C
T
amb
Ambient Temperature -40 to +125 °C
Symbol Parameter Value Unit
V
S
Supply Voltage 10 to V
cl
V
V
out
(*) High Side Reference -1 to Vboot-V
cl
V
V
boot
(*) Floating Supply Rail 500 V
f
max
Maximum Switching Frequency 400 kHz
L6598
4/16
ELECTRICAL CHARACTERISTCS
(V
S
=12V;V
BOOT
-V
OUT
=12V;T
amb
=25°C)
Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
SUPPLYVOLTAGE
V
suvp
12 V
S
TurnOn Threshold 10 10.7 11.4 V
V
suvn
V
S
TurnOff Threshold 7.3 8 8.7 V
V
suvh
Supply Voltage Under Voltage
hysteresis
2.7 V
V
cl
Supply Voltage Clamping 14.6 15.6 16.6 V
I
su
Start Up Current V
s
<V
suvn
250 µA
I
q
Quiescent Current, fout =
60kHz, no load
V
s
>V
suvp
2mA
HIGH VOLTAGESECTION
I
bootleak
16 BOOT pin Leakage Current V
BOOT
= 580V 5 mA
I
outleak
14 OUT pin Leakage Current V
OUT
= 562V 5 mA
R
don
16 Bootstrap Driver On Resistance 150 Ω
HIGH/LOW SIDE DRIVERS
I
hvgso
15 High Side Driver Source Current V
HVG
-V
OUT
= 0 170 250 mA
I
hvgsi
High Side Driver Sink Current V
HVG
-V
BOOT
= 0 300 450 mA
I
lvgso
11 Low Side Driver Source Current V
LVG-GND
= 0 170 250 mA
I
lvgsi
Low Side Driver Sink Current V
LVG - VS
= 0 300 450 mA
t
rise
15,11 Low/High Side Output Rise Time C
load
= 1nF 80 120 ns
t
fall
C
load
= 1nF 40 80 ns
OSCILLATOR
DC 14 Output Duty Cycle 48 50 52 %
f
min
Minimum Output Oscillation
Frequency
C
f
= 470pF; R
fmin
= 50k 58.2 60 61.8 kHz
f
start
Soft Start Output Oscillation
Frequency
C
f
= 470pF; R
fmin
= 50k;
R
fstart
=47k
114 120 126 kHz
V
ref
2, 4 Voltageto Current Converters
Threshold
22
t
d
14 Dead Time between Low and
High Side Conduction
0.2 0.27 0.35
µ
s
TIMING SECTION
k
ss
1 Soft Start Timing constant C
ss
= 330nF 0.115 0.15 0.185 s/
µ
F
5/16
L6598
Figure 1. EN2 Timing Diagrams
SENSE OP AMP
l
IB
6, 7 Input Bias Current 0.1 µA
V
io
Input Offset Voltage -10 10 mV
R
out
5 Output Resistance 200 300
Ω
I
out-
Source Output Current V
out
= 4.5V 1 mA
I
out+
Sink Output Current V
out
= 0.2V 1 mA
V
ic
6,7 OP AMP input common mode
range
-0.2 3 V
GBW Sense Op Amp Gain Band
Width Product
1MHz
G
dc
DC Open Loop Gain 80 dB
COMPARATORS
V
the1
8 Enabling Comparator Threshold 0.56 0.6 0.64 V
V
the2
9 Enabling Comparator Threshold 1.05 1.2 1.35 V
t
pulse
8,9 Minimum Pulse lenght 200 ns
Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
V
S
T
SS
fstart
fmin
EN2
V
Css
f
OUT
T
SS
D98IN889
ELECTRICAL CHARACTERISTCS (continued)
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