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BM2596 데이터시트 PDF




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부품번호 BM2596 기능
기능 Step Down Voltage Converter
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BM2596 데이터시트, 핀배열, 회로
BM2596
(MSP1250G)
150kHz 3A
Step-down Voltage Converter
General Description
The BM2596(=MSP1250G) series of regulators are integrated circuits that provide all
active functions for a step-down (buck) switching regulator, capable of driving a 3A load
with excellent line and load regulation. These devices are avail-able in fixed output voltages
of 3.3V, 5V, 12V, and an adjust-able output version.
Requiring a minimum number of external components, these regulators are simple to use
www.DataSheet4U.com and include internal frequency compensation†, and a fixed-frequency oscillator.
The MSP1250G series operates at a switching frequency of 150 kHz thus allowing smaller
sized filter components than what would be needed with lower frequency switching
regulators. Available in a standard 5-lead TO-220 package with 5 pins lead in one line
options, and a 5-lead TO-263 surface mount package. A standard series of inductors are
available from several different manufacturers optimized for use with the MSP1250G series.
This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±2% tolerance on output voltage under specified input
voltage and output load conditions, and ±10% on the oscillator frequency. External
shutdown is included, featuring typically 80 µA standby current. Self-protection features
include a two stage frequency reducing current limit for the output switch and an over tem
perature shutdown for complete protection under fault conditions.
Features
3.3V, 5V, 12V, and adjustable output versions (ADJ)
Adjustable version output voltage range, 1.25V to 37V±2% max over line and load
conditions
Available in TO-220 and TO-263 packages
Guaranteed 3A output load current
Input voltage range up to 40V
Requires only 4 external components
Excellent line and load regulation specifications
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, IQ typically 80 µA
G means Pb free in MSP1250G
Uses readily available standard inductors
Thermal shutdown and current limit protection
Applications
Simple high-efficiency step-down (buck) regulator , CAR DVD electronic
On-card switching regulators , LCD-TV , LCD-monitor , ADSL
Positive to negative converter
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BM2596 pdf, 반도체, 판매, 대치품
BM2596
(MSP1250G)
150kHz 3A
Step-down Voltage Converter
Electrical Characteristics Condition :TJ = 25
VO=3.3V
MSP1250G-- VO=3.3V
Symbol Parameter
Conditions
Min Typ Max
(Note 4) (Note 3)
www.DataSheet4U.com SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1
(Note4 )
VOUT
Output
Voltage
4.75V VIN 40V
0.2A ILOAD 3A
3.18
3.3
3.42
Efficiency VIN=12V ILOAD=3A --
75 --
VO=5V
Symbol Parameter
Conditions
MSP1250G-- VO=5.0V
Min Typ Max
(Note 4) (Note 3) (Note4 )
SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1
VOUT
Output
Voltage
7V VIN 40V
0.2A ILOAD 3A
4.80
5.0
5.250
Efficiency VIN=12V
-- 84 --
VO=12V
Symbol Parameter
Conditions
MSP1250G-- VO=12.0V
Min Typ Max
(Note 4) (Note 3) (Note4 )
SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1
VOUT
Output
Voltage
15V VIN 40V
0.2A ILOAD 3A
11.40
12.0
12.60
Efficiency VIN=25V ILOAD=3A
--
88
---
Vout is adjustable
MSP1250G—ADJ
Symbol Parameter
Conditions
Min Typ Max
(Note 4) (Note 3) (Note4 )
SYSTEM PARAMETERS (Note 5) Test Circuit Figure 1
4.5V VIN 40V
0.2A ILOAD 3A
VFB
Feedback
Voltage
VOUT
programmed for
1.21
1.25 1.29
3V. Circuit of
Figure 1
Efficiency
VIN=12V
VOUT=3V ILOAD=3A
--
75
--
Units
V
%
Units
V
%
Units
V
%
Units
V
%
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BM2596 전자부품, 판매, 대치품
BM2596
(MSP1250G)
150kHz 3A
Step-down Voltage Converter
EXTERNAL COMPONENTS
INPUT CAPACITOR CIN — A low ESR aluminum or tantalum bypass capacitor is needed
between the input pin and ground pin. It must be located near the regulator using short
leads. This capacitor prevents large voltage transients from appearing at the input, and
provides the instantaneous current needed each time the switch turns on. Selecting an
input capacitor requires consulting the manufacturers data sheet for maximum allowable
www.DataSheet4U.com RMS ripple current. For a maximum ambient temperature of 40°C, a general guideline
would be to select a capacitor with a ripple current rating of approximately 50% of the DC
load current. For ambient temperatures up to 70°C, a current rating of 75% of the DC load
current would be a good choice for a conservative design. The capacitor voltage rating must
be at least 1.25 times greater than the maximum input voltage, and often a much higher
voltage capacitor is needed to satisfy the RMS current requirements.
FEEDFORWARD CAPACITOR (Adjustable Output Voltage Version) CFF ----A feed
forward Capacitor CFF, shown across R2 in Figure1 is used when the output voltage is
greater than 10V or when COUT has a very low ESR. This capacitor adds lead compensation
to the feedback loop and increases the phase margin for better loop stability.
OUTPUT CAPACITOR COUT —An output capacitor is required to filter the output and
provide regulator loop stability. Low impedance or low ESR Electrolytic or solid tantalum
capacitors designed for switching regulator applications must be used. When selecting an
output capacitor, the important capacitor parameters are; the 100 kHz Equivalent Series
resistance (ESR), the RMS ripple current rating, voltage rating, and capacitance value. For
the output capacitor, the ESR value is the most important parameter. The output capacitor
requires an ESR value that has an upper and lower limit. For low output ripple voltage, a low
ESR value is needed. This value is determined by the maximum allowable output ripple
voltage, typically 1% to 2% of the output voltage. But if the selected capacitor’s ESR is
extremely low, there is a possibility of an unstable feedback loop, resulting in an oscillation
at the output.
CATCH DIODE D----Buck regulators require a diode to provide a return path for the
inductor current when the switch turns off. This must be a fast diode and must be located
close to the MSP1250G using short leads and short printed circuit traces. Because of their
very fast switching speed and low forward voltage drop, Schottky diodes provide the best
performance, especially in low output voltage applications (5V and lower). Ultra fast
recovery, or High-Efficiency rectifiers are also a good choice, but some types with an abrupt
turnoff characteristic may cause instability or EMI problems.
INDUCTOR SELECTION L----All switching regulators have two basic modes of operation;
continuous and discontinuous. The difference between the two types relates to the inductor
current, whether it is flowing continuously, or if it drops to zero for a period of time in the
normal switching cycle. Each mode has distinctively different operating characteristics,
which can affect the regulators performance and requirements. Most switcher designs will
operate in the discontinuous mode when the load current is low. The MSP1250G (or any of
the Simple Switcher family) can bemused for both continuous and discontinuous modes of
operation.
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BM2596

Step Down Voltage Converter

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