|
|
PDF MAX15001 Data sheet ( Hoja de datos )
| Número de pieza | MAX15001 | |
| Descripción | (MAX15000 / MAX15001) Current-Mode PWM Controllers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX15001 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
19-3957; Rev 0; 1/06
Current-Mode PWM Controllers with
Programmable Switching Frequency
General Description
The MAX15000/MAX15001 current-mode PWM con-
trollers contain all the control circuitry required for the
design of wide-input-voltage isolated and nonisolated
power supplies. The MAX15000 is well suited for uni-
versal input (rectified 85VAC to 265VAC) or telecom
(-36VDC to -72VDC) power supplies. The MAX15001
is well suited for low input voltage (9.5VDC to 24VDC)
power supplies.
The MAX15000/MAX15001 contain an internal error
amplifier that regulates the tertiary winding output volt-
age which is used in primary-side-regulated isolated
power supplies. Primary-side regulation eliminates 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. An open-drain UVLO flag output,
with 210µs internal delay, allows the sequencing of a
secondary-side controller. The input-supply start volt-
age is externally programmable with a voltage-divider.
A UVLO/EN input is used to shutdown the MAX15000/
MAX15001. Internal digital soft-start eliminates output
voltage overshoot.
The MAX15000 has an internal bootstrap UVLO with
large hysteresis that requires a minimum 23.6V for start-
up. The MAX15001 does not have the internal bootstrap
UVLO and can be biased directly from a minimum volt-
age of 9.5V.
The switching frequency for the MAX15000/MAX15001 is
programmable with an external resistor. The MAX15000A/
MAX15001A provide a 50% maximum duty-cycle limit,
while the MAX15000B/MAX15001B provide a 75% maxi-
mum duty-cycle limit. These devices are available in 10-
pin µMAX® packages and are rated for operation over the
-40°C to +85°C temperature range.
Applications
1/2, 1/4, and 1/8th Brick Power Modules
High-Efficiency, Isolated Telecom Power
Supplies
Networking/Servers
Isolated Keep-Alive Power Supplies
12V Boost and SEPIC Regulators
Isolated and Nonisolated High-Brightness LED
Power Supplies
Industrial Power Conversion
Selector Guide appears at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Features
♦ Current-Mode Control
♦ Programmable Switching Frequency Up to 625kHz
♦ Accurate UVLO Threshold (1%)
♦ Open-Drain UVLO Flag Output with Internal Delay
♦ 36V to 72V Telecom Voltage Range
♦ Universal Offline Input Voltage Range
Rectified 85VAC to 265VAC (MAX15000)
♦ 9.5V to 24V Input (MAX15001)
♦ Digital Soft-Start
♦ Internal Bootstrap UVLO with Large Hysteresis
(MAX15000)
♦ Internal Error Amplifier with 1.5% Accurate
Reference
♦ 50µA (typ) Startup Supply Current
♦ 50% Maximum Duty-Cycle Limit
(MAX15000A/MAX15001A)
♦ 75% Maximum Duty-Cycle Limit
(MAX15000B/MAX15001B)
♦ 60ns Cycle-by-Cycle Current-Limit Propagation
Delay
♦ Available in Tiny 10-Pin µMAX Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX15000AEUB+ -40°C to +85°C 10 µMAX
U10-2
MAX15000BEUB+ -40°C to +85°C 10 µMAX
U10-2
MAX15001AEUB+ -40°C to +85°C 10 µMAX
U10-2
MAX15001BEUB+ -40°C to +85°C 10 µMAX
U10-2
Warning: The MAX15000/MAX15001 are designed to work with
high voltages. Exercise caution.
+Denotes lead-free package.
Pin Configuration
TOP VIEW
UVLO/EN 1
UFLG 2
FB 3
COMP 4
CS 5
MAX15000
MAX15001
µMAX
10 IN
9 VCC
8 NDRV
7 GND
6 RT
________________________________________________________________ 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
Current-Mode PWM Controllers with
Programmable Switching Frequency
Typical Operating Characteristics (continued)
(VUVLO/EN = +1.4V, VFB = +1V, COMP = open, VCS = 0V, TA = +25°C, unless otherwise noted.)
UVLO/EN SHUTDOWN THRESHOLD
vs. TEMPERATURE
1.180
UVLO/EN FALLING
1.175
1.170
1.165
1.160
1.155
1.150
-40
-15 10 35 60
TEMPERATURE (°C)
VCC REGULATOR SET POINT
vs. TEMPERATURE
9.8
VIN = 19V
NDRV NOT SWITCHING
9.6
85
9.4
NDRV SWITCHING
fSW = 350kHz
9.2
9.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
CURRENT-LIMIT TRIP THRESHOLD
60
TOTAL NUMBER
OF DEVICES = 140
50
40
30
20
10
0
0.964 0.978 0.993 1.007 1.022 1.036
CURRENT-LIMIT TRIP THRESHOLD (V)
VIN SUPPLY CURRENT IN UVLO
vs. TEMPERATURE
65
VIN = 19V
MAX15000 WHEN IN
BOOTSTRAP UVLO
60
55
50
45
-40
-15 10 35 60
TEMPERATURE (°C)
85
VCC REGULATOR SET POINT
vs. TEMPERATURE
8.9
VIN = 19V
8.8
8.7 10mA LOAD
8.6
8.5
8.4
20mA LOAD
8.3
8.2
8.1
-40
-20 0 20 40 60
TEMPERATURE (°C)
80
SWITCHING FREQUENCY
vs. TEMPERATURE
355
+3σ
350
345
MEAN
340
335
330
325
-40
-3σ
TOTAL NUMBER OF DEVICES = 140
-15 10 35 60
TEMPERATURE (°C)
85
VIN SUPPLY CURRENT AFTER
STARTUP vs. TEMPERATURE
2.0
VIN = 24V
fSW = 350kHz
1.9
1.8
1.7
1.6
1.5
-40
-15 10 35 60
TEMPERATURE (°C)
85
CURRENT-LIMIT TRIP THRESHOLD
vs. TEMPERATURE
1.02
+3σ
1.01
1.00
MEAN
0.99
0.98
0.97
0.96
-40
-3σ
TOTAL NUMBER OF DEVICES = 140
-15 10 35 60
TEMPERATURE (°C)
85
SWITCHING FREQUENCY
60
TOTAL NUMBER
OF DEVICES = 140
50
40
30
20
10
0
326.7
333.5 340.3 347.2 354.0 360.8
SWITCHING FREQUENCY (kHz)
_______________________________________________________________________________________ 5
5 Page 
www.DataSheet4U.com
Current-Mode PWM Controllers with
Programmable Switching Frequency
n-Channel MOSFET Switch Driver
The NDRV output drives an external n-channel MOSFET.
The internal regulator output (VCC), set to approximately
9V, drives NDRV. For the universal input voltage range,
the MOSFET used must withstand the DC level of the
high-line input voltage plus the reflected voltage at the
primary of the transformer. Most applications that use the
discontinuous flyback topology require a MOSFET rated
at 600V. NDRV can source/sink in excess of 650/1000mA
peak current; therefore, select a MOSFET that will yield
acceptable conduction and switching losses.
Oscillator/Switching Frequency
Use an external resistor at RT to program the
MAX15000/MAX15001 internal oscillator frequency
between 50kHz and 2.5MHz. The MAX15000A/
MAX15001A output switching frequency is one-half of
the programmed oscillator frequency with a 50% duty
cycle. The MAX15000B/MAX15001B output switching
frequency is one-quarter of the programmed oscillator
frequency with a 75% duty cycle.
The MAX15000A/MAX15001A and MAX15000B/
MAX15001B have programmable output switching fre-
quencies from 25kHz to 625kHz and 12.5kHz to
625kHz, respectively. Use the following formulas to
determine the appropriate value of the resistor R12
(see Figure 1) needed to generate the desired output
switching frequency (fSW) at the NDRV output:
R12 = 1010 for the MAX15000A /MAX15001A.
2fSW
R12 = 1010 for the MAX15000B /MAX15001B.
4fSW
where R12 is the resistor connected from RT to GND
(see Figure 1).
Connect an RC network in parallel with R12 as shown in
Figure 1. The RC network should consist of a 100nF
capacitor C6 (for stability) in series with resistor R15
which serves to further minimize jitter. Use the following
formula to determine the value of R15:
1
R15 = 88.9 × (R12) 4
For example, if R12 is 4kΩ, R15 becomes 707Ω.
MAX15000 fig04
VOUT
2V/div
100mA LOAD ON/VOUT1
100mA LOAD ON/VOUT2
2ms/div
Figure 4. Primary-Side Output Voltage Soft-Start During Initial
Startup for the Circuit in Figure 6
Internal Error Amplifier
The MAX15000/MAX15001 include an internal error
amplifier to regulate the output voltage in the case of a
nonisolated power supply (see Figure 1). For the circuit
in Figure 1, calculate the output voltage using the fol-
lowing equation:
VOUT
=
1+
R13
R14
VREF
where VREF = 1.23V. The amplifier’s noninverting input
is internally connected to a digital soft-start circuit that
gradually increases the reference voltage during start-
up applied to this input. This forces the output voltage
to come up in an orderly and well-defined manner
under all load conditions.
The error amplifier may also be used to regulate the ter-
tiary winding output which implements a primary-side-
regulated, isolated power supply (see Figure 6). For the
circuit in Figure 6, calculate the output voltage using
the following equation:
VOUT
=
NS
NT
1+
R1
R2
VREF
+ VD6 − VD2
where NS is the number of secondary winding turns, NT
is the number of tertiary winding turns, and both VD6
and VD2 are the diode drops at the respective outputs.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX15001.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX15000 | (MAX15000 / MAX15001) Current-Mode PWM Controllers | Maxim Integrated Products |
| MAX15001 | (MAX15000 / MAX15001) Current-Mode PWM Controllers | Maxim Integrated Products |
| MAX15003 | Triple-Output Buck Controller | Maxim Integrated Products |
| MAX15004 | (MAX15004 / MAX15005) 4.5V to 40V Input Automotive Flyback/Boost/SEPIC Power-Supply Controllers | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |