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PDF MAX5053 Data sheet ( Hoja de datos )
| Número de pieza | MAX5053 | |
| Descripción | (MAX5052 / MAX5053) Current-Mode PWM Controllers | |
| Fabricantes | Maxim Integrated Products | |
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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.
1 page  
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Typical Operating Characteristics (continued)
(UVLO = +1.4V, VFB = +1V, VCOMP = floating, VCS = 0V, TA = +25°C, unless otherwise noted.)
CURRENT-LIMIT TRIP THRESHOLD
30
TOTAL NUMBER OF
DEVICES = 200
25
20
15
10
5
0
260 270 280 290 300 310 320
CURRENT-LIMIT TRIP THRESHOLD (mV)
SWITCHING FREQUENCY
vs. TEMPERATURE
280
275 +3σ
TOTAL NUMBER OF
DEVICES = 100
270
265
MEAN
260
255
250
-3σ
245
240
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
SWITCHING FREQUENCY
30
TOTAL NUMBER OF
DEVICES = 200
25
20
15
10
5
0
230
240 250 260 270 280
SWITCHING FREQUENCY (kHz)
290
PROPAGATION DELAY FROM CURRENT-LIMIT
COMPARATOR INPUT TO NDRV vs. TEMPERATURE
75
70
65
60
55
50
-40 -20
0
20 40 60
TEMPERATURE (°C)
80
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-40
UVLO/EN PROPAGATION DELAY
vs. TEMPERATURE
UVLO/EN RISING
UVLO/EN FALLING
-20 0 20 40 60 80
TEMPERATURE (°C)
INPUT CURRENT
vs. INPUT CLAMP VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0
INPUT VOLTAGE (V)
27.0
26.8
26.6
26.4
26.2
26.0
25.8
25.6
25.4
25.2
25.0
-40
INPUT CLAMP VOLTAGE
vs. TEMPERATURE
IIN = 2mA
-20 0 20 40 60
TEMPERATURE (°C)
80
REFERENCE VOLTAGE
vs. TEMPERATURE
1.230
VIN = 12V
1.229
1.228
1.227
1.226
1.225
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
NDRV OUTPUT IMPEDANCE
vs. TEMPERATURE
2.2
2.1
VIN = 24V
SINKING 100mA
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
-40 -20 0 20 40 60
TEMPERATURE (°C)
80
_______________________________________________________________________________________ 5
5 Page 
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
Current Limit
The current-sense resistor (RCS), connected between
the source of the MOSFET and ground, sets the current
limit. The CS input has a voltage-trip level (VCS) of
291mV. Use the following equation to calculate the
value of RCS:
RCS
=
VCS
IPRI
Where IPRI is the peak current in the primary that flows
through the MOSFET.
When the voltage produced by this current (through the
current-sense resistor) exceeds the current-limit com-
parator threshold, the MOSFET driver (NDRV) quickly
terminates the current ON-cycle, typically within 60ns.
In most cases, a small RC filter is required to filter out
the leading-edge spike on the sense waveform. Set the
corner frequency at a few megahertz.
Applications Information
Primary Regulated, Isolated
Telecom Power Supply
Figure 5 shows a complete design of a dual-output power
supply with a telecom voltage range of 36V to 72V. An
important aspect of this power supply is its primary-side
regulation. This regulation, through the tertiary winding,
also acts as bias winding for the MAX5052.
In the circuit of Figure 5, cross-regulation has been
improved (tertiary and 5V outputs) by using chip induc-
tors, L1 and L2, and R7||R2. R7||R2 presents enough
loading on the tertiary winding output to allow ±5% load
regulation on the 5V output over a load current range
from 150mA to 1.5A.
5V OUTPUT LOAD REGULATION
6.0
5.8
5.6
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
0.15 0.35 0.55 0.75 0.95 1.15 1.35
IOUT (A)
Figure 7. Output Voltage Regulation for the Figure 5 Circuit
Layout Recommendations
All printed circuit board traces carrying switching cur-
rents must be kept as short as possible, and the cur-
rent loops they form must be minimized. The pins of the
µMAX package have been placed to allow easy inter-
facing to the external MOSFET.
For universal AC input design, all applicable safety reg-
ulations must be followed. Offline power supplies may
require UL, VDE, and other similar agency approvals.
These agencies can be contacted for the latest layout
and component rules.
Typically there are two sources of noise emission in a
switching power supply: high di/dt loops and high dv/dt
surfaces. For example, traces that carry the drain cur-
rent often form high di/dt loops. Similarly, the heatsink
of the MOSFET presents a dv/dt source, thus the sur-
face area of the heatsink must be minimized as much
as possible.
To achieve best performance, a star ground connection
is recommended to avoid ground loops. For example,
the ground returns for the power-line input filter, power
MOSFET switch, and sense resistor should be routed
separately through wide copper traces to meet at a sin-
gle-system ground connection.
Chip Information
TRANSISTOR COUNT: 1449
PROCESS: BiCMOS
12V
R2
VIN NDRV
C1
VCC MAX5053 CS
C2 C3
COMP
GND
FB UVLO/EN
R3
0V
L1 D1
C4
Q1
R1
Figure 8. 12V to 15V Out Boost Regulator
15V
R5
R6
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX5053.PDF ] | |
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