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L6590 Datasheet

FULLY INTEGRATED POWER SUPPLY

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L6590
FULLY INTEGRATED POWER SUPPLY
s WIDE-RANGE MAINS OPERATION
s "ON-CHIP" 700V V(BR)DSS POWER MOS
s 65 kHz INTERNAL OSCILLATOR
s 2.5V ± 2% INTERNAL REFERENCE
s STANDBY MODE FOR HIGH EFFICIENCY AT
LIGHT LOAD
s OVERCURRENT AND LATCHED
OVERVOLTAGE PROTECTION
s NON DISSIPATIVE BUILT-IN START-UP CIRCUIT
s THERMAL SHUTDOWN WITH HYSTERESIS
s BROWNOUT PROTECTION (SMD PACKAGE
ONLY)
MINIDIP
SO16W
ORDERING NUMBERS:
L6590N
L6590D
- HOME APPLIANCES/LIGHTING
s LINE CARD, DC-DC CONVERTERS
MAIN APPLICATIONS
s WALL PLUG POWER SUPPLIES UP TO 15 W
s AC-DC ADAPTERS
s AUXILIARY POWER SUPPLIES FOR:
- CRT AND LCD MONITOR (BLUE ANGEL)
- DESKTOP PC/SERVER
- FAX, TV, LASER PRINTER
TYPICAL APPLICATION CIRCUIT
DESCRIPTION
The L6590 is a monolithic switching regulator de-
signed in BCD OFF-LINE technology, able to operate
with wide range input voltage and to deliver up to
15W output power. The internal power switch is a lat-
eral power MOSFET with a typical RDS(on) of 13
and a V(BR)DSS of 700V minimum.
AC line
88 to 264 Vac
DRAIN
1
L6590
6, 7, 8
4
GND COMP
Vcc
3
5
VFB
Pout
up to 15W
AC line
88 to 264 Vac
Primary Feedback
DRAIN
1
L6590
Vcc
3
6, 7, 8 5
4
GND VFB COMP
Secondary Feedback
Pout
up to 15W
October 2000
1/23


STMicroelectronics Electronic Components Datasheet

L6590 Datasheet

FULLY INTEGRATED POWER SUPPLY

No Preview Available !

L6590
DESCRIPTION (continued)
The MOSFET is source-grounded, thus it is possible
to build flyback, boost and forward converters.
The device can work with secondary feedback and a
2.5V±2% internal reference, in addition to a high gain
error amplifier, makes possible also the use in appli-
cations either with primary feedback or not isolated.
The internal fixed oscillator frequency and the integrated
non dissipative start-up generator minimize the external
component count and power consumption.
The device is equipped with a standby function that
automatically reduces the oscillator frequency from
65 to 22 kHz under light load conditions to enhance
efficiency (Pin < 1W @ Pout = 0.5W with wide range
mains).
Internal protections like cycle-by-cycle current limiting,
latched output overvoltage protection, mains undervolt-
age protection (SMD version only) and thermal shut-
down generate a 'robust' design solution.
The IC uses a special leadframe with the ground pins
(6, 7 and 8 in minidip, 9 to16 in SO16W package) in-
ternally connected in order for heat to be easily re-
moved from the silicon die. An heatsink can then be
realized by simply making provision of few cm2 of
copper on the PCB. Furthermore, the pin(s) close to
the high-voltage one are not connected to ease com-
pliance with safety distances on the PCB.
BLOCK DIAGRAM
GND
(6,7,8)
PGND
[9, ..., 16]
DRAIN
(1) [1]
[x] : L6590D (SO16W)
START-UP
THERMAL
SHUTDOWN
SUPPLY
& UVLO
VREF
+
-
OVP VREF
+
- OCP
STANDBY
OSC
65/22 kHz
BROWNOUT
+
PWM
-
2.5V
-
+
2.5V
VCC
(3) [4]
SGND
[5]
BOK
[6]
VFB
(5) [8]
COMP
(4) [7]
PIN CONNECTIONS (Top view)
DRAIN
N.C.
Vcc
COMP
MINIDIP
L6590
GND
GND
GND
VFB
DRAIN
N.C.
N.C.
Vcc
SGND
BOK
COMP
VFB
SO16W
L6590D
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
2/23


Part Number L6590
Description FULLY INTEGRATED POWER SUPPLY
Maker STMicroelectronics
Total Page 23 Pages
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