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MAX5077 Datasheet

  • MAX5077

  • 推挽式FET驅(qū)動器，帶有振蕩器和可編程時鐘輸出

  • 9頁

  • MAXIM   MAXIM

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19-3663; Rev 0; 5/05
Push-Pull FET Driver with Integrated Oscillator
and Programmable Clock Output
General Description
The MAX5077 is a +4.5V to +15V push-pull, current-fed
topology driver subsystem with an integrated oscillator
used in telecom module power supplies. The device
drives two MOSFETs connected to a center-tapped
transformer primary providing secondary-side, isolated,
negative or positive voltages. The MAX5077 features a
programmable accurate integrated oscillator with a
synchronizing clock output to synchronize an external
PWM regulator. A single external resistor programs the
internal oscillator frequency from 50kHz to 1.5MHz.
The MAX5077 incorporates dual MOSFET drivers with
鹵3A peak drive currents and 50% duty cycle. The
MOSFET drivers generate complementary signals to
drive external ground-referenced n-channel MOSFETs.
The MAX5077 clock output frequency is programmable
by logic inputs to set the clock output to 1x, 2x, or 4x
the MOSFET鈥檚 driver frequency.
The MAX5077 is available in a 14-pin exposed pad
TSSOP package and is specified over the -40擄C to
+125擄C operating temperature range.
Features
o
Dedicated Current-Fed, Push-Pull Driver
Subsystem
o
Oscillator Frequency Programmable from 50kHz
to 1.5MHz
o
Single +4.5V to +15V Supply Voltage Range
o
鹵3A Peak Gate-Drive Current
o
1mA Operating Current at 250kHz with No
Capacitive Load
o
Selectable Synchronizing Clock Frequency for a
Preceding PWM Stage
o
Thermally Enhanced 14-Pin TSSOP
o
-40擄C to +125擄C Operating Temperature Range
MAX5077
Ordering Information
PART
TEMP RANGE
-40擄C to +125擄C
PIN-PACKAGE
14 TSSOP-EP*
PKG
CODE
U14E-3
Applications
Current-Fed Power Supplies
Power-Supply Building Subsystems
Push-Pull Driver Subsystems
MAX5077AUD
*EP
= Exposed paddle.
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
V
IN
V
IN
DRVH
V
OUT
SYNCIN
PWM
CONTROLLER
V
CC
CLK
MAX5077
V
CC
SEL1
I.C.
NDRV1
NDRV2
DRVL
GND
RT
AGND
DGND
SEL2
PGND
GND
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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