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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5052 Datasheet

(MAX5052 / MAX5053) Current-Mode PWM Controllers

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19-2590; Rev 1; 11/03
EVAALVUAAILTAIOBNLEKIT
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
General Description
The MAX5052/MAX5053 current-mode PWM controllers
contain all the control circuitry required for the design of
wide-input-voltage isolated and nonisolated power
supplies. The MAX5052 is well suited for universal input
(rectified 85VAC to 265VAC) or telecom (-36VDC to
-72VDC) power supplies. The MAX5053 is well suited for
low-input-voltage (10.8VDC to 24VDC) power supplies.
The MAX5052/MAX5053 contain an internal error ampli-
fier that regulates the tertiary winding output voltage.
This implements a primary-side regulated, isolated
power supply, eliminating the need for an optocoupler.
An input undervoltage lockout (UVLO) is provided for
programming the input-supply start voltage and to
ensure proper operation during brownout conditions.
The input-supply start voltage is externally programma-
ble with a voltage-divider. To shutdown the device, the
UVLO pin is pulled low. Internal digital soft-start
reduces output voltage overshoot. The internal thermal
shutdown circuit protects the device in the event the
junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with
large hysteresis that requires a minimum voltage of
23.6V for startup. The MAX5053 does not have the
internal bootstrap UVLO and can be biased directly
from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to
±12% accuracy; this allows the optimization of the
magnetic and filter components resulting in compact,
cost-effective power supplies. The MAX5052A/
MAX5053A are offered with a 50% maximum duty-cycle
limit. The MAX5052B/MAX5053B are offered with a 75%
maximum duty-cycle limit. These devices are available
in 8-pin µMAX packages and operate over the -40°C to
+85°C temperature range.
Universal Input AC
Power Supplies
Isolated Telecom Power
Supplies
Networking Systems
Computer Systems/
Servers
Applications
Industrial Power
Conversion
Isolated Keep-Alive
Circuits
12V Boost Regulators
12V SEPIC Regulators
Features
Available in a Tiny 8-Pin µMAX Package
Current-Mode Control
50W Output Power
Universal Offline Input Voltage Range
Rectified 85VAC to 265VAC (MAX5052)
VIN Directly Driven from 10.8V to 24V Input
(MAX5053)
Digital Soft-Start
Programmable Input Startup Voltage
Internal Bootstrap UVLO with Large Hysteresis
(MAX5052)
Internal Error Amplifier with 1% Accurate
Reference
Thermal Shutdown
45µA (typ) Startup Supply Current
1.4mA (typ) Operating Supply Current
Fixed Switching Frequency of 262kHz ±12%
50% Maximum Duty-Cycle Limit
(MAX5052A/MAX5053A)
75% Maximum Duty-Cycle Limit
(MAX5052B/MAX5053B)
60ns Cycle-by-Cycle Current-Limit Response Time
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5052AEUA
-40°C to +85°C 8 µMAX
MAX5052BEUA
-40°C to +85°C 8 µMAX
MAX5053AEUA
-40°C to +85°C 8 µMAX
MAX5053BEUA
-40°C to +85°C 8 µMAX
Warning: The MAX5052/MAX5053 are designed to work with
high voltages. Exercise caution.
Pin Configuration
TOP VIEW
UVLO/EN 1
FB 2
COMP 3
CS 4
MAX5052
MAX5053
8 VIN
7 VCC
6 NDRV
5 GND
Functional Diagram/Typical Operating Circuit/Selector
Guide appear at end of data sheet.
µMAX
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX5052 Datasheet

(MAX5052 / MAX5053) Current-Mode PWM Controllers

No Preview Available !

Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
ABSOLUTE MAXIMUM RATINGS
VIN to GND .............................................................-0.3V to +30V
VCC to GND ............................................................-0.3V to +13V
FB, COMP, UVLO, CS to GND .................................-0.3V to +6V
NDRV to GND.............................................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Junction Temperature ......................................................+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
(VIN = +12V (for MAX5052, VIN must first be brought up to 23.6V for startup), 10nF bypass capacitors at VIN and VCC, CNDRV = 0,
VUVLO = +1.4V, VFB = +1.0V, VCOMP = floating, VCS = 0V, typical values are measured at TA = +25°C, TA = -40°C to + 85°C, unless
otherwise noted.) (Note 1)
PARAMETER
SYMBOL
UNDERVOLTAGE LOCKOUT/STARTUP
Bootstrap UVLO Wake-Up Level
Bootstrap UVLO Shutdown Level
UVLO/EN Wake-Up Threshold
UVLO/EN Shutdown Threshold
UVLO/EN Input Current
UVLO/EN Hysteresis
VSUVR
VSUVF
VULR2
VULF2
IUVLO
CONDITIONS
VIN rising (MAX5052 only)
VIN falling (MAX5052 only)
UVLO/EN rising
UVLO/EN falling
TJ = +125°C
MIN TYP MAX UNITS
19.68
9.05
1.188
1.168
21.6
9.74
1.28
1.23
25
50
23.60
10.43
1.371
1.291
V
V
V
V
nA
mV
VIN Supply Current In
Undervoltage Lockout
ISTART
VIN = +19V, for MAX5052 only when in
bootstrap UVLO
45 90 µA
VIN Range
UVLO/EN Propagation Delay
Bootstrap UVLO Propagation
Delay
INTERNAL SUPPLY
VCC Regulator Set Point
VIN Supply Current After Startup
Shutdown Supply Current
GATE DRIVER
Driver Output Impedance
Driver Peak Sink Current
Driver Peak Source Current
PWM COMPARATOR
Comparator Offset Voltage
CS Input Bias Current
Comparator Propagation Delay
Minimum On-Time
VIN
tEXTR
tEXTF
tBUVR
tBUVF
UVLO/EN steps up from +1.1V to +1.4V
UVLO/EN steps down from +1.4V to +1.1V
VIN steps up from +9V to +24V
VIN steps down from +24V to +9V
VCCSP
IIN
VIN = +10.8V to +24V, sinking 1µA to 20mA
from VCC
VIN = +24V
UVLO/EN = low
RON(LOW) Measured at NDRV sinking, 100mA
RON(HIGH) Measured at NDRV sourcing, 20mA
VOPWM
ICS
tPWM
tON(MIN)
VCOMP - VCS
VCS = 0V
VCS = +0.1V
10.8
7
1.15
-2
12
1.8
5
1
1.4
2
4
1
0.65
1.38
60
150
24
10.5
2.5
90
4
12
1.70
+2
V
µs
µs
V
mA
µA
A
A
V
µA
ns
ns
2 _______________________________________________________________________________________


Part Number MAX5052
Description (MAX5052 / MAX5053) Current-Mode PWM Controllers
Maker Maxim Integrated Products
Total Page 13 Pages
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