MAX5068BAUE+ Maxim Integrated Products, MAX5068BAUE+ Datasheet

IC CNTRLR PWM CRNT MD 16TSSOP

MAX5068BAUE+

Manufacturer Part Number
MAX5068BAUE+
Description
IC CNTRLR PWM CRNT MD 16TSSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX5068FAUE.pdf (20 pages)

Specifications of MAX5068BAUE+

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
1.25MHz
Duty Cycle
50%
Voltage - Supply
10.8 V ~ 24 V
Buck
No
Boost
No
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 125°C
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Frequency-max
1.25MHz
Duty Cycle (max)
50 %
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
25 KHz to 1250 KHz
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
Yes
Topology
Flyback, Forward
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX5068 is a high-frequency, current-mode,
pulse-width modulation (PWM) controller that integrates
all the building blocks necessary for implementing AC-
DC or DC-DC fixed-frequency power supplies. Isolated
or nonisolated power supplies are easily constructed
using either primary- or secondary-side regulation.
Current-mode control with leading-edge blanking sim-
plifies control-loop design, and a programmable inter-
nal slope-compensation circuit stabilizes the current
loop when operating at duty cycles above 50%. The
MAX5068A/B limit the maximum duty cycle to 50% for
use in single-ended forward converters. The
MAX5068C/D/E/F allow duty cycles up to 75%. The
MAX5068 features an accurate externally programma-
ble oscillator that simplifies system design.
An input undervoltage lockout (UVLO) programs the
input-supply startup voltage and ensures proper opera-
tion during brownout conditions.
A single external resistor programs the output switching
frequency from 12.5kHz to 1.25MHz. The MAX5068A/
B/C/E provide a SYNC input for synchronization to an
external clock. The maximum FET-driver duty cycle is
50% for the MAX5068A/B and 75% for the MAX5068C/
D/E/F. Programmable hiccup current limit provides
additional protection under severe faults.
The MAX5068 is specified over the -40°C to +125°C
automotive temperature range and is available in a
16-pin thermally enhanced TSSOP-EP package. Refer to
the MAX5069 data sheet for dual FET-driver applications.
Warning: The MAX5068 is designed to work with high
voltages. Exercise caution.
19-3176; Rev 1; 7/04
Selector Guide appears at end of data sheet.
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.
High-Frequency, Current-Mode PWM Controller
Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion
________________________________________________________________ Maxim Integrated Products
with Accurate Programmable Oscillator
General Description
Applications
♦ Current-Mode Control with 47µA (typ) Startup
♦ Resistor-Programmable ±4.5% Accurate
♦ Rectified 85V
♦ Input Directly Driven from 10.8V to 24V
♦ Frequency Synchronization Input
♦ Programmable Dead Time and Slope
♦ Programmable Startup Voltage (UVLO)
♦ Programmable UVLO Hysteresis
♦ Integrating Fault Protection (Hiccup)
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin Thermally Enhanced TSSOP-EP Package
*EP = Exposed pad.
MAX5068AAUE
MAX5068BAUE
MAX5068CAUE
MAX5068DAUE
MAX5068EAUE
MAX5068FAUE
Pin Configurations continued at end of data sheet.
TOP VIEW
Current
Switching Frequency:
Input (MAX5068A/C/D)
(MAX5068B/E/F)
(MAX5068A/B/C/E)
Compensation
(MAX5068A/B/D/F)
25kHz to 1.25MHz (MAX5068A/B)
12.5kHz to 625kHz (MAX5068C/D/E/F)
PART
UVLO/EN
FLTINT
COMP
SYNC
HYST
DT
RT
FB
AC
1
2
3
4
5
6
7
8
to 265V
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
TSSOP-EP
Ordering Information
MAX5068A/B
Pin Configurations
AC
or 36V
16
15
14
13
12
11
10
9
REG5
IN
V
NDRV
AGND
PGND
AGND
CS
DC
CC
PIN-PACKAGE
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
16 TSSOP-EP*
Features
to 72V
DC
1

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MAX5068BAUE+ Summary of contents

Page 1

... Networking System Power Supplies Server Power Supplies Industrial Power Conversion Selector Guide appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ Current-Mode Control with 47µA (typ) Startup Current ♦ ...

Page 2

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator ABSOLUTE MAXIMUM RATINGS IN to PGND ............................................................-0.3V to +30V IN to AGND.............................................................-0.3V to +30V V to PGND..........................................................-0.3V to +13V AGND..........................................................-0.3V to +13V CC FB, COMP, CS, HYST, SYNC, REG5 ...

Page 3

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator ELECTRICAL CHARACTERISTICS (continued +12V for the MAX5068B/E/ 1µ 100kΩ; NDRV = floating; T VCC RT PARAMETER SYMBOL CS Input Bias Current CS Blanking ...

Page 4

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator ELECTRICAL CHARACTERISTICS (continued +12V for the MAX5068B/E/ 1µ 100kΩ; NDRV = floating; T VCC RT PARAMETER SYMBOL NDRV Switching Frequency f RT Voltage ...

Page 5

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator (V = +12V for the MAX5068B/E/ 1µ 100kΩ; NDRV = floating; V VCC RT BOOTSTRAP UVLO WAKE-UP LEVEL vs. TEMPERATURE 21.6 MAX5068A/C/D 21.5 21.4 21.3 21.2 ...

Page 6

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator (V = +12V for the MAX5068B/E/ 1µ 100kΩ; NDRV = floating; V VCC RT REG5 OUTPUT VOLTAGE vs 4.985 I = 100µA REG5 ...

Page 7

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator (V = +12V for the MAX5068B/E/ 1µ 100kΩ; NDRV = floating; V VCC RT FLTINT CURRENT vs. TEMPERATURE 63.0 62.9 62.8 62.7 62.6 62.5 62.4 62.3 ...

Page 8

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator PIN MAX5068A MAX5068C MAX5068D MAX5068B MAX5068E MAX5068F — 3 — 2 — ...

Page 9

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator Detailed Description The MAX5068 is a current-mode PWM controller for use in isolated and nonisolated power-supply applications. A bootstrap UVLO with a programmable hysteresis, very low startup, and low operating current result ...

Page 10

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator Figure 1. Nonisolated Power Supply with Programmable Input Supply Voltage Use the MAX5068C/D/E/F in forward converter applica- tions with greater than 50% duty ...

Page 11

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator MAX5068C/E 1.23V 1.18V Figure 2. Setting the MAX5068C/E Undervoltage Lockout Threshold MAX5068A/B/D/F UVLO with Programmable Hysteresis In addition to programmable undervoltage lockout dur- ing startup, the MAX5068A/B/D/F incorporate a UVLO/EN hysteresis that ...

Page 12

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator During startup, the UVLO circuit keeps the PWM com- parator, ILIM comparator, oscillator, and output driver shut down to reduce current consumption. Once V reaches 23.6V, the UVLO circuit turns on both ...

Page 13

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator FLTINT C3 MAX5068A REG5 SYNC AGND Figure 6. Secondary-Side, Regulated, Isolated Power Supply Assuming C1 > C3, calculate ...

Page 14

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator Use the following formula to calculate the internal oscil- lator frequency osc R RT where f is the oscillator frequency and R OSC resistor connected from RT to ...

Page 15

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator where I = 60µ the desired fault-integra- FLTINT SH tion time during which current-limit events from the cur- rent-limit comparator are ignored. For example, a 0.1µF capacitor gives a fault-integration ...

Page 16

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator optimally compensated, the current loop responds to input-voltage transients within one cycle. The current-sense resistor (R ), connected between CS the source of the MOSFET and ground, sets the current limit. The ...

Page 17

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator FLTINT C3 MAX5068C REG5 SYNC AGND PART MAX DUTY BOOTSTRAP NUMBER CYCLE UVLO MAX5068A 50% Yes MAX5068B 50% No ...

Page 18

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator HYST* UVLO/EN UVLO 1.23V/ 1.18V 2.8V/ 1.6V 60µA Q FLTINT CURENT-LIMIT COMPARATOR 314mV 5kΩ CS 70ns AGND BLANKING ***SCOMP COMPENSATION DIGITAL 1.23V SOFT-START FB *MAX5068A/B/D AND MAX5068F ONLY. **MAX5068A/B/C AND MAX5068E ONLY. ...

Page 19

High-Frequency, Current-Mode PWM Controller with Accurate Programmable Oscillator TOP VIEW RT 1 SYNC 2 SCOMP 3 MAX5068C UVLO/ COMP 7 FLTINT 8 TSSOP-EP ______________________________________________________________________________________ Pin Configurations (continued REG5 HYST 2 ...

Page 20

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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