max5059auit Maxim Integrated Products, Inc., max5059auit Datasheet

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max5059auit

Manufacturer Part Number
max5059auit
Description
Parallelable, Secondary-side Synchronous Rectifier Driver And Feedback-generator Controller Ics
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.MAX5059AUIT.pdf (25 pages)
The MAX5058/MAX5059 enable secondary-side syn-
chronous rectification in isolated power supplies using
widely available power MOSFETs. These devices facili-
tate the commutation of the secondary-side MOSFETs by
providing a clean gate-drive signal that is synchronized
to the power MOSFET switching in the primary side of
the isolation transformer. The MAX5058/MAX5059 com-
plement the MAX5051 and MAX5042/MAX5043 primary-
side PWM ICs and enable the design of high-efficiency
synchronously rectified isolated power supplies.
Simultaneous conduction of the primary side and the
freewheeling synchronous rectifier MOSFET is avoided
by having a look-ahead signal (before the primary-side
MOSFETs turn ON), thus eliminating large current spikes
resulting from a shorted transformer secondary.
An on-board error amplifier with a versatile current ref-
erence output enables virtually unlimited possibilities in
reference-voltage generation. Reference voltage for the
error amplifier is generated by connecting an appropri-
ate resistor to this output.
Low on-resistance margining MOSFETs integrated on-
chip allow for implementation of a margining circuit
without the use of external switches. The MAX5058 pro-
vides a 5V LDO output for logic-level MOSFETs while
the MAX5059 provides a 10V LDO output for conven-
tional 10V MOSFETs.
The MAX5058/MAX5059 are designed to enable paral-
leling of multiple power supplies for accurate current
sharing using a simple 2-wire, differential, current-share
bus. Parallelability enables expansion of the power
capabilities and simplifies thermal management in high-
output-current applications. When used in conjunction
with the MAX5051, the primaries can also be synchro-
nized and operated 180 degrees out of phase.
The MAX5058/MAX5059 are available in a 28-pin ther-
mally enhanced TSSOP package and operate over a
wide -40°C to +125°C temperature range.
Warning: The MAX5058/MAX5059 are designed to
work in circuits that contain high voltages. Exercise
caution.
19-3045; Rev 0; 10/03
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.
Parallelable Secondary-Side Synchronous Rectifier
Isolated Telecom Power Supplies
Isolated Networking Power Supplies
±48V Power-Supply Modules
Industrial Power Supplies
±48V/±12V Server Power Supplies
Driver and Feedback-Generator Controller ICs
________________________________________________________________ Maxim Integrated Products
General Description
EVALUATION KIT
AVAILABLE
Applications
♦ Clean Drive Waveforms for Synchronous
♦ Utilization of a Look-Ahead Signal from the
♦ Synchronous Rectifier Drivers Capable of
♦ Internal Gate-Voltage Regulator for 5V (MAX5058)
♦ Internal Error Amplifier
♦ Accurate Differential Current-Share/Force Circuit
♦ Internal Remote Voltage-Sense Amplifier
♦ Flexible Reference-Voltage Generation
♦ Output Voltage Regulation Down to 0.5V
♦ Low Quiescent Current Consumption of 2.5mA
♦ Integrated Digital Output Margining Circuit Saves
♦ 30ns Propagation Delay Time from Pulse Input
♦ Automatic Detection of Discontinuous Current
♦ High Efficiency at Low Output Currents and
♦ Open-Drain Overtemperature Warning Flag
♦ 28-Pin Thermally Enhanced TSSOP Package
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
MAX5058AUI
MAX5058EUI
MAX5059AUI
MAX5059EUI
MOSFETs
Primary for Proper Turn-On/Turn-Off Times
Sourcing and Sinking Up to 2A Peak Current
or 10V (MAX5059) Gate-Drive Voltage
Allows Paralleling of Several Power Supplies for
High Output Current
External Parts and Board Space
to Output
Conduction and Turn-Off of the Freewheeling
MOSFET
Reverse-Current Protection
PART
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
TEMP RANGE
Ordering Information
PIN-
PACKAGE
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
Features
V
(V)
REG
10
10
5
5
1

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max5059auit Summary of contents

Page 1

Rev 0; 10/03 EVALUATION KIT AVAILABLE Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs General Description The MAX5058/MAX5059 enable secondary-side syn- chronous rectification in isolated power supplies using widely available power MOSFETs. These devices facili- tate the commutation ...

Page 2

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs ABSOLUTE MAXIMUM RATINGS V+ to GND .............................................................-0.3V to +30V PGND to GND .......................................................-0.3V to +0.3V COMPV VDR, TSF to GND......................... -0.3V to +14V REG All Other Pins to GND ...

Page 3

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs ELECTRICAL CHARACTERISTICS (continued) (V+ = +12V, GND = PGND = 0, VDR = 1.785V 2.2µ 1µF, C VSP VREG VP are ...

Page 4

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs ELECTRICAL CHARACTERISTICS (continued) (V+ = +12V, GND = PGND = 0, VDR = V REG V = 1.785V 2.2µ 1µF, C VSP VREG VP are at T ...

Page 5

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs ELECTRICAL CHARACTERISTICS (continued) (V+ = +12V, GND = PGND = 0, VDR = 1.785V 2.2µ 1µF, C VSP VREG VP are ...

Page 6

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs (V+ = +12V, GND = PGND = 0, VDR = V REG V = 1.785V 0.5V 2.2µF, C VSP COMPS VREG LDO OUTPUT VOLTAGE (V ) VREG ...

Page 7

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs (V+ = +12V, GND = PGND = 0, VDR = 1.785V 0.5V, C VSP COMPS VREG QUIESCENT SUPPLY CURRENT vs. INPUT VOLTAGE (MAX5058) 3.0 2.8 2.6 ...

Page 8

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs (V+ = +12V, GND = PGND = 0, VDR = V REG V = 1.785V 0.5V 2.2µF, C VSP COMPS VREG SWITCHING SUPPLY CURRENT vs. TEMPERATURE (MAX5059) ...

Page 9

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs (V+ = +12V, GND = PGND = 0, VDR = 1.785V 0.5V, C VSP COMPS VREG ZERO-CURRENT PROPAGATION DELAY vs. TEMPERATURE 90 10mV OVERDRIVE 85 80 ...

Page 10

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs PIN NAME Zero-Inductor Current-Sense Comparator Input. The source voltage of the freewheeling FET (N4 in the Typical 1 ZCP Application Circuit) is sensed. The gate drive is terminated when this voltage ...

Page 11

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs MARGINING BLOCK MRGU 8 50kΩ MRGD 9 50kΩ RMGD 10 QMD RMGU 11 QMU ERROR AMPLIFIER BLOCK COMPV 13 INV 14 E/A I REF I 12 REF 50μA REFERENCE CURRENT BLOCK ...

Page 12

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs Detailed Description The MAX5058/MAX5059 enable the design of high-effi- ciency, isolated power supplies using synchronous rec- tification on the secondary side. These devices commutate the secondary-side MOSFETs by providing a clean ...

Page 13

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs The MOSFET drivers are synchronized to the primary- side switching by using the BUFIN input. BUFIN accepts the PWM information from the primary through a high-speed optocoupler or through a small ...

Page 14

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs 4.7Ω MAX5051 REG5 LXVDD LXH GND Figure 4. Interface of MAX5058 to MAX5051 Using a High-Speed Optocoupler 4.7Ω MAX5051 REG5 LXVDD LXH 2kΩ GND Figure 5. Interface of MAX5059 to MAX5051 ...

Page 15

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs Reverse-Current Prevention in Synchronous Rectifiers One benefit of secondary-side synchronous rectifica- tion is increased efficiency. Another benefit is that it allows the inductor current to remain continuous throughout the operating load ...

Page 16

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs C27 R19 C28 COMPV 13 INV 14 E/A I REF I REF 12 50μA Figure 8. Optocoupler Connection for V OUT > 2.5V V REG (PIN 23) R19 C27 C28 COMPV ...

Page 17

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs 1) Select a parallel equivalent resistance R produce the nominal reference voltage. For exam- ple 35.4kΩ gives you Select the margin-up percentage value: Δ ...

Page 18

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs E/A I REF 50μA Figure 12. Remote-Sense Amplifier Connection for V OUT > 2.5V (or any Other Arbitrary Voltage) 9) Select a value for R and calculate R 1 3.3V: R ...

Page 19

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs V IN+ V IN- SYNCIN STARTUP SYNCOUT V IN+ V IN+ 36V TO 72V V V IN- IN- SYNCIN STARTUP SYNCOUT V IN+ V IN- SYNCIN STARTUP SYNCOUT Figure 13. Paralleling ...

Page 20

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs 1.5μA SLOPE = 1.15μA/V 1.25V Figure 14. Transfer Function Curve of the Block FEEDBACK NETWORK V OUT PWM STAGE E/A AND FILTERS G (s) PS ...

Page 21

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs POWER-STAGE GAIN/PHASE GAIN -10 -15 - 100 FREQUENCY (Hz) Figure 16. Idealized (with Ideal Power Stage and Optocoupler) Frequency Response (G PS (s)) ...

Page 22

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs Figure 18. Schematic of a +48V Input, 3.3V at 15A Output, Synchronous Rectified, Isolated Power Supply 22 ______________________________________________________________________________________ Typical Application Circuit ...

Page 23

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs R20 = R26 = R36 = 0Ω LOAD CURRENT (A) Figure 19. Efficiency at Nominal 3.3V Output Voltage ...

Page 24

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs R20 = R26 = R36 = 0Ω 2μs/div Figure 23. Output Voltage Ripple at +48V Nominal Input Voltage and Full Load Current (Scope Bandwidth = 20MHz) Pin Configuration TOP VIEW ZCP ...

Page 25

Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages Maxim cannot assume responsibility for use ...

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