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Part: MAX5074
Category:
Power Management
-> PWM Controllers
Description: Power ic With Integrated MOSFETs For ISOlated Ieee 802.3af PD And Telecom Power-supply Applications <<<>>>The MAX5074 ISOlated PWM Power ic Features Integrated Switching Power MOSFETs Connected in a Voltageclamped, Two-transistor, Power-circuit Configuration. This Device CAN be Used in Both Forward And Flyback Configurations With a Wide Input Voltage Range From 11V to 76V And up to 15W of Output Power. <<<>>>The Voltage-clamped Power Topology Enables Full Recovery of Stored Magnetizing And Leakage Inductive Energy For Enhanced Efficiency And Reliability. A Lookahead Signal For Driving Secondary-side Synchronous Rectifiers CAN be Used to Increase Efficiency. <<<>>><<<>>>A Wide Array of Protection Features Includes Uvlo, Overtemperature Shutdown, And Short-circuit Protection With Hiccup Current Limit For Enhanced Performance And Reliability. Operation up to 500kHz Allows Smaller External Magnetics And Capacitors. <<<>>><<<>>>The MAX5074 is Rated For Operation Over The -40 C to +125 C Temperature Range And is Available in a 20-pin Tssop Package. <<<>>><<<>>>KEY Features <<<>>>Clamped, Two-switch Power ic For High Efficiency <<<>>>No Reset Winding Required <<<>>>Up to 15W Output Power <<<>>>Bias Voltage Regulator With Automatic High- Voltage Supply Turn-off <<<>>>11V to 76V Wide Input Voltage Range <<<>>>Integrated High-voltage 0.4 Power MOSFETs <<<>>>Feed-Forward Voltage-mode Control For Fast Input Transient Rejection <<<>>>Programmable Brownout Undervoltage Lockout <<<>>>Internal Overtemperature Shutdown <<<>>>Indefinite Short-circuit Protection With Programmable Fault Integration <<<>>>Integrated Look-ahead Signal For Secondary-side Synchronous Rectification <<<>>>>90% Efficiency With Synchronous Rectification <<<>>>Up to 500kHz Switching Frequency <<<>>>High-Power (1.74W), Small-footprint 20-Pin Thermally Enhanced Tssop Package <<<>>><<<>>>APPLICATIONS<<<>>>48V Input, ISOlated Power-supply Modules<<<>>><<<>>>adsl Line Cards<<<>>><<<>>>adsl Line-driver Power Supplies<<<>>><<<>>>distributed Power Systems With 48V Bus<<<>>><<<>>>high-efficiency Telecom/datacom Power Supplies<<<>>><<<>>>ieee 802.3af PD Power Supplies<<<>>><<<>>>isolated ip Phone Power Supplies<<<>>><<<>>>wlan Access-point Power Supplies
Company: Maxim Integrated Products
Datasheet: Download MAX5074 datasheet File size : 1059 kB
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Datasheet text preview:
19-3312; Rev 0; 7/04
T AVAILABLE EVALUATION KI
Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications
General Description
The MAX5074 isolated PWM power IC features integrated s w i t c h i n g power MOSFETs connected in a voltageclamped, two-transistor, power-circuit configuration. This device can be used in both forward and flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power. T h e voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. A lookahead signal for driving secondary-side synchronous rectifiers can be used to increase efficiency. A wide array of protection features includes UVLO, overtemperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows smaller external magnetics and capacitors. The MAX5074 is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package. Warning: The MAX5074 is designed to work with high voltages. Exercise caution. No Reset Winding Required Up to 15W Output Power Bias Voltage Regulator with Automatic HighVoltage Supply Turn-Off 11V to 76V Wide Input Voltage Range Integrated High-Voltage 0.4 Power MOSFETs Feed-Forward Voltage-Mode Control For Fast Input Transient Rejection Programmable Brownout Undervoltage Lockout Internal Overtemperature Shutdown Indefinite Short-Circuit Protection With Programmable Fault Integration Integrated Look-Ahead Signal for Secondary-Side Synchronous Rectification >90% Efficiency with Synchronous Rectification Up to 500kHz Switching Frequency High-Power (1.74W), Small-Footprint 20-Pin Thermally Enhanced TSSOP Package
Features
Clamped, Two-Switch Power IC for High Efficiency
MAX5074
Applications
IEEE 802.3af PD Power Supplies Isolated IP Phone Power Supplies High-Efficiency Telecom/Datacom Power Supplies 48V Input, Isolated Power-Supply Modules WLAN Access-Point Power Supplies ADSL Line Cards ADSL Line-Driver Power Supplies Distributed Power Systems with 48V Bus
Ordering Information
PART MAX5074AUP TEMP RANGE -40°C to +125°C PIN-PACKAGE 20-TSSOP-EP*
*EP = Exposed pad.
Pin Configuration
TOP VIEW
REGOUT 1 RTCT 2 FLTINT 3 RCFF 4 RAMP 5 OPTO 6 CSS 7 PPWM 8 GND 9 CS 10 20 INBIAS 19 HVIN 18 UVLO 17 BST
Simplified Application Circuit
VIN CIN DRNH D1 T1 XFRMRH D3 VOUT COUT
DRVH
QH
MAX5074
16 DRNH 15 XFRMRH 14 DRVIN 13 XFRMRL 12 SRC 11 PGND DRVL
MAX5074
XFRMRL QL D2
SRC
TSSOP
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications MAX5074
ABSOLUTE MAXIMUM RATINGS
HVIN, INBIAS, DRNH, XFRMRH, XFRMRL to GND.......-0.3V to +80V BST to GND ...-0.3V to +95V BST to XFRMRH .....-0.3V to +12V PGND to GND .......-0.3V to +0.3V UVLO, RAMP, CSS, OPTO, FLTINT, RCFF, RTCT to GND......-0.3V to +12V SRC, CS to GND.......-0.3V to +6V REGOUT, DRVIN to GND ......-0.3V to +12V REGOUT to HVIN .........-80V to +0.3V REGOUT to INBIAS ......-80V to +0.3V REGOUT Current .......50mA PPWM to GND...-0.3V to (REGOUT + 0.3V) PPWM Current ........±20mA DRNH, XFRMRH, XRFMRL, SRC Continuous Current (Average) TJ = +125°C....0.9A TJ = +150°C....0.6A Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP-EP (derate 21.7mW/°C above +70°C) ....1.739W 20-Pin TSSOP-EP (JA) ......46°C/W Operating Temperature Range .......-40°C to +125°C Maximum Junction Temperature ....+150°C Storage Temperature Range .....-60°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VHVIN = 12V, CINBIAS = 1µF, CREGOUT = 2.2µF, RRTCT = 25k, CRTCT = 100pF, CBST = 0.22µF, VCSS = VCS = 0V, VRAMP = VUVLO = 3V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER Input Supply Range OSCILLATOR (RTCT) PWM Frequency Maximum PWM Duty Cycle Maximum RTCT Frequency RTCT Peak Trip Level RTCT Valley Trip Level RTCT Input Bias Current RTCT Discharge MOSFET RDS(ON) RTCT Discharge Pulse Width LOOK-AHEAD LOGIC (PPWM) PPWM to XFRMRL Output Propagation Delay PPWM Output High PPWM Output Low Common-Mode Range Input Offset Voltage Input Bias Current RAMP to XFRMRL Propagation Delay Minimum OPTO Voltage Minimum RCFF Voltage From RAMP (50mV overdrive) rising to XFRMRL rising VCSS = 0V, OPTO sinking 2mA RCFF sinking 2mA -2 100 1.47 2.18 tP P W M VOH VOL V CM-PWM PPWM rising to XFRMRL falling Sourcing 2mA Sinking 2mA 0 10 +2 7.0 110 11.0 0.4 5.5 ns V V V mV µA ns V V Sinking 20mA fS D MAX fRTCTMAX VTH RRTCT = 25k, CRTCT = 100pF RRTCT = 25k, CRTCT = 100pF (Note 2) 256 47 1 0.51 x V REGOUT 0.04 x V REGOUT ±1 30 50 60 kHz % MHz V V µA ns SYMBOL V HVIN CONDITIONS MIN 11 TYP MAX 76 UNITS V
PWM COMPARATOR (OPTO, RAMP, RCFF)
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Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications
ELECTRICAL CHARACTERISTICS (continued)
(VHVIN = 12V, CINBIAS = 1µF, CREGOUT = 2.2µF, RRTCT = 25k, CRTCT = 100pF, CBST = 0.22µF, VCSS = VCS = 0V, VRAMP = VUVLO = 3V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER REGOUT LDO (REGOUT) REGOUT Voltage Set Point V REGOUT INBIAS floating, VHVIN = 11V to 76V VINBIAS = VHVIN = 11V to 76V INBIAS floating, VHVIN = 15V, IREGOUT = 0 to 30mA REGOUT Load Regulation VINBIAS = VHVIN = 15V, IREGOUT = 0 to 30mA REGOUT Dropout Voltage REGOUT Undervoltage Lockout Threshold REGOUT Undervoltage Lockout Threshold Hysteresis SOFT-START (CSS) Soft-Start Current FLTINT Source Current FLTINT Trip Point FLTINT Hysteresis INTERNAL POWER MOSFETs (See Figure 1, QH and QL) On-Resistance Off-State Leakage Current Total Gate Charge Per FET HIGH-SIDE DRIVER Low-to-High Delay High-to-Low Delay Driver Output Voltage LOW-SIDE DRIVER Low-to-High Delay High-to-Low Delay CURRENT-LIMIT COMPARATOR (CS) Current-Limit Threshold Voltage Current-Limit Input Bias Current V ILIM IBILIM 0 < VCS < 0.3V 140 -2 156 172 +2 mV µA Driver delay until FET VGS reaches 0.9 x VDRVIN and is fully on Driver delay until FET VGS reaches 0.1 x VDRVIN and is fully off 80 40 ns ns Driver delay until FET VGS reaches 0.9 x (VBST - VXFRMRH) and is fully on Driver delay until FET VGS reaches 0.1 x (VBST - VXFRMRH) and is fully off BST to XFRMRH with high side on 80 40 8 ns ns V RDS(ON) VDRVIN = VBST = 9V, VXFRMRH = VSRC = 0V, IDS = 50mA -5 15 0.4 0.8 +5 µA nC ICSS IF L T I N T FLTINT rising 33 80 2.7 0.8 µA µA V V INTEGRATING FAULT PROTECTION (FLTINT) INBIAS floating, IREGOUT = 30mA VINBIAS = VHVIN, IREGOUT = 30mA REGOUT rising REGOUT falling 6.6 0.7 0.25 1.25 1.25 7.4 V V V 8.3 9.5 9.2 11.0 0.25 V V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5074
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