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PDF MAX5058 Data sheet ( Hoja de datos )
| Número de pieza | MAX5058 | |
| Descripción | Parallelable Secondary-Side Synchronous Rectifier Driver and Feedback-Generator Controller ICs | |
| Fabricantes | Maxim Integrated Products | |
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19-3045; Rev 0; 10/03
www.DataSheet4U.com
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 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.
Applications
Isolated Telecom Power Supplies
Isolated Networking Power Supplies
±48V Power-Supply Modules
Industrial Power Supplies
±48V/±12V Server Power Supplies
Features
o Clean Drive Waveforms for Synchronous
MOSFETs
o Utilization of a Look-Ahead Signal from the
Primary for Proper Turn-On/Turn-Off Times
o Synchronous Rectifier Drivers Capable of
Sourcing and Sinking Up to 2A Peak Current
o Internal Gate-Voltage Regulator for 5V (MAX5058)
or 10V (MAX5059) Gate-Drive Voltage
o Internal Error Amplifier
o Accurate Differential Current-Share/Force Circuit
Allows Paralleling of Several Power Supplies for
High Output Current
o Internal Remote Voltage-Sense Amplifier
o Flexible Reference-Voltage Generation
o Output Voltage Regulation Down to 0.5V
o Low Quiescent Current Consumption of 2.5mA
o Integrated Digital Output Margining Circuit Saves
External Parts and Board Space
o 30ns Propagation Delay Time from Pulse Input
to Output
o Automatic Detection of Discontinuous Current
Conduction and Turn-Off of the Freewheeling
MOSFET
o High Efficiency at Low Output Currents and
Reverse-Current Protection
o Open-Drain Overtemperature Warning Flag
o 28-Pin Thermally Enhanced TSSOP Package
Ordering Information
PART
TEMP RANGE
MAX5058AUI
MAX5058EUI
MAX5059AUI
MAX5059EUI
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
*EP = Exposed paddle.
PIN-
PACKAGE
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
28 TSSOP-EP*
VREG
(V)
5
5
10
10
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
www.DataSheet4U.com
Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +12V, GND = PGND = 0, VDR = VREG, CQSYNC = CQREC = 0, ZCP = ZCN = BUFIN = CSP = CSN = SFN = VSN = GND, VIREF =
VVSP = 1.785V, CVREG = 2.2µF, CVP = 1µF, CCOMPS = 0.1µF, CSFP = 68nF, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
CURRENT-ADJUST AMPLIFIER (CAA)
Transconductance
Common-Mode Input Voltage
Range
Output Voltage Range
Offset Voltage
TA = +25°C
Open-Loop Gain
CURRENT-ADJUST VOLTAGE-TO-CURRENT CONVERTER
Input Voltage Range
Input Voltage Offset
Output Voltage Range
Transconductance
Maximum Current Adjustment
Value
THERMAL SHUTDOWN
Thermal Warning Flag Level
When TSF pulls low
Thermal Warning Flag Hysteresis
Internal Thermal-Shutdown Level
Internal Thermal-Shutdown
Hysteresis
TSF Maximum Output Voltage
TSF Output Leakage Current
ITSF = 5mA
MIN TYP MAX UNITS
500 µA/V
0.45 2.55 V
0.85 2.75 V
20 42 65 mV
72 dB
0.75
0.5
1.38
1.25
1.15
1.5
2.75
2.5
1.66
V
V
V
µA/V
µA
+125
15
+160
15
120
0.1
°C
°C
°C
°C
mV
µA
Note 1: Output resistance to ground used for unity-gain stability.
Note 2: VCSO = GCSA(VCSP - VCSN) + VLS.
_______________________________________________________________________________________ 5
5 Page 
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Parallelable Secondary-Side Synchronous Rectifier
Driver and Feedback-Generator Controller ICs
MARGINING BLOCK
MRGU 8
50kΩ
MRGD 9
RMGD 10
50kΩ
QMD
MAX5058/MAX5059
REGULATOR AND THERMAL MANAGEMENT BLOCK
SD DRIVERS
UVLO AND
THERMAL
SHUTDOWN
LDO
5V/10V
CURRENT-SHARE BLOCK
RR
22 V+
PREG
4V
21 VP
23 VREG
7 TSF
+125°C FLAG
RMGU 11
QMU
SFA 5 SFP
COMPV 13
INV 14
ERROR AMPLIFIER BLOCK
V TO I
E/A 500µS
CAA
42mV
IREF 12
COMPS 6
VSO 15
VSN 16
VSP 17
IREF
50µA
REFERENCE CURRENT BLOCK
REMOTE-SENSE AMPLIFIER BLOCK
X1
RSA
I = (1.15 x (VCAA - 1.25))µA
VCAA ≥ 1.25V
RR
X1
0.5V
X2
4 SFN
20 CSP
10 CSN
18 CSO
GATE-DRIVER BLOCK
BUFIN 24
ZCP 1
20ns
ZCN 2
GND 3
20ns
5mV
SD DRIVERS
30ns FALLING
EDGE DELAY
25 VDR
26 QREC
28 QSYNC
27 PGND
Figure 1. MAX5058/MAX5059 Functional Diagram
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet MAX5058.PDF ] | |
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