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Part: L6590A
Category:
Power Management
-> PWM Power Supply
Description: Fully Integrated Power Supply
Company: ST Microelectronics, Inc.
Datasheet: Download L6590A datasheet File size : 1147 kB
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Datasheet text preview:
L6590A
FULLY INTEGRATED POWER SUPPLY
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WIDE-RANGE MAINS OPERATION " O N - C H I P " 7 0 0 V V (BR)DSS P O W E R M O S 65 kHz INTERNAL OSCILLATOR STANDBY MODE FOR HIGH EFFICIENCY AT LIGHT LOAD OVERCURRENT AND LATCHED OVERVOLTAGE PROTECTION NON DISSIPATIVE BUILT-IN START-UP CIRCUIT THERMAL SHUTDOW N W ITH HYSTERESIS BROWN OUT PROTECTION
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MINIDIP ORDERING NUMBER: L6590AN
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- HOME APPLIANCES/LIGHTING LINE CARD, DC-DC CONVERTERS
MAIN APPLICATIONS s WALL PLUG POWER SUPPLIES UP TO 15W
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DESCRIPTION The L6590A is a monolithic switching regulator designed 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 lateral power MOSFET with a typical RDS(on) of 13 and a V(BR)DSS of 700V minimum.
AC-DC ADAPTERS AUXILIARY POW ER SUPPLIES FOR: - CR T AND LCD MONITOR (BLUE ANGEL) - DESKTOP PC/SERVER - FAX, TV, LASER PRIN TER
TYPICAL APPLICATION CIRCUIT
AC line 88 to 264 Vac
Pout up to 15W
DRAIN
1
BOK
L6590A
5 3
Vcc
6, 7, 8
GND COMP
4
October 2000
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L6590A
DESCRIPTION (continued) The MOSFET is source-grounded, thus it is possible to build flyback, boost and forward converters. The device is meant to work with secondary feedback for tight tolerance of the regulated output voltage. 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 BLOCK DIAGRA M
DRAIN (1)
START-UP
efficiency (Pin < 1W @ Pout = 0.5W with wide range mains). Internal protections like cycle-by-cycle current limiting, latched output overvoltage protection, mains undervoltage protection and thermal shutdown generate a 'robust' design solution. The IC uses a special leadframe with the ground pins (6, 7 and 8) internally connected in order for heat to be easily removed 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 close to the high-voltage one is not connected to ease compliance with safety distances on the PCB.
VCC (3)
THERMAL S.DO W N SUPPLY & UVLO OVER VOLTAGE
+ -
VREF BROW NO UT
+ +
GND (6,7,8)
-
OVER CURRENT PW M
-
BOK (5)
2.5V
STANDBY OSC 65/2 2 kHz 1 mA
COMP (4)
PIN CONNECTIONS (Top view)
DRAIN N.C. Vcc COMP
GND GND GND BOK
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L6590A
PIN FUNCTIONS
N° 1 2 3 Pin DRAIN N.C. Vcc Description Drain connection of the internal power MOSFET. The internal high voltage start-up generator sinks current from this pin. Not internally connected. Provision for clearance on the PCB. Supply pin of the IC. An electrolytic capacitor is connected between this pin and ground. The internal start-up generator charges the capacitor until the voltage reaches the start-up threshold. The PWM is stopped if the voltage at the pin exceeds a certain value. PWM Control Input. The voltage on this pin (VCOMP) controls the PWM modulator: the higher VCOMP, the higher the duty cycle. The pin will be driven by a current sink (usually the transistor of an optocoupler) able to modulate VCOMP by modulating the current. Brownout Protection. If the voltage applied to this pin is lower than 2.5V the PWM is disabled. This pin is typically used for sensing the input voltage of the converter through a resistor divider. If not used, the pin can be either left floating or connected to Vcc through a 15 k resistor. Connection of both the source of the internal MOSFET and the return of the bias current of the IC. Pins connected to the metal frame to facilitate heat dissipation.
4
COMP
5
BOK
6 to 8
GND
THERMAL DATA
Symbol Rthj-amb Rthj-pins Parameter Thermal Resistance Junction-ambient (*) Thermal Resistance Junction-pins Value 35 to 60 15 Unit °C/W °C/W
(*) Value depending on PCB copper area and thickness.
ABSOLUTE MAXIMUM RATINGS
Symbol Vds Id Vcc Iclamp Drain Source Voltage Drain Current IC Supply Voltage Vcc Zener Current PWM Control Input Sink Current BOK pin Sink Current Ptot Power Dissipation at Tamb < 50°C 3 cm2, 2 oz copper dissipating area on PCB Operating Junction Temperature Storage Temperature Parameter Value -0.3 to 700 0.7 18 20 3 1 1.5 Unit V A V mA mA mA W
Tj Tstg
-40 to 150 -40 to 150
°C °C
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