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BM1430 데이터시트 PDF




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부품번호 BM1430 기능
기능 3.0A Step-Down Converter
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BM1430 데이터시트, 핀배열, 회로
www.DataSheet.co.kr
3.0A Step-Down Converter
BM1430
FEATURES
 3A Output Current
 Efficiency up to nearly 90% @+5V /3A output
 +3.85V to +23V Input Range
55µA Shutdown Supply Current
380kHz Switching Frequency
 Adjustable Output Voltage from 1.22V to 0.85*VIN
Cycle-by-Cycle Current Limit Protection
Thermal Shutdown Protection
 Frequency Fold Back at Short Circuit
Low start up input voltage ; Low dropout to nearly 0.7V
full pin-pin with ACT4060/ TD1410 / MP1410
 SOP-8 Package
GENERAL DESCRIPTION
The BM1430 is a current-mode step-down
DC-DC converter that generates up to 3A output
current at 380kHz switching frequency. The device
utilizes advanced BCD process for operation with
input voltage up to +23V consuming only 55µA in
shutdown mode, the BM1430 is highly efficient
with peak efficiency at 90% when in operation.
Protection features include cycle-by-cycle
current limit, thermal shutdown, and frequency fold
back at short circuit.
The BM1430 is available in SOP-8
package and requires very few external
devices for operation.
APPLICATIONS
 TFT LCD Monitors
Portable DVDs
 NET CARD
Telecom Power Supplies
 DSL and Cable Modems and Routers
LCD TV
It can replace TD1410/MP9141 without
change external components and PCB layout.
If Vin is over 12V, if not use pin7
function , can pull-up a 100K ohm to Vin input
with a pull-up resistor, be better not short to Vin
dirrectly.
Figure4.
XL1583
Typical
Figure
1A. TpypplicicalaAtipopnlicCatiiorncuCiitrc1u2itV-5(CVFF/3=A0
~ 33nF)
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BM1430 pdf, 반도체, 판매, 대치품
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Function Block
BM1430
Figure3. Function Block Diagram of XL1583
Typical Application Circuit
Figure 2 . Functional Block Diagram
FUNCTIONAL DESCRIPTION
As seen in Figure 2, Functional Block Diagram,
the BM1430 is a current mode pulse width
modulation (PWM) converter. The converter
operates as follows:
A switching cycle starts when the rising edge of
the Oscillator clock output causes the High-Side
Power Switch to turn on and the Low-Side Power
Switch to turn off. With the SW side of the inductor
now connected to IN, the inductor current ramps
up to store energy in the its magnetic field. The
inductor current level is measured by the Current
Sense Amplifier and added to the Oscillator ramp
signal. If the resulting summation is higher than
COMP internal voltage, output of the PWM
Comparator goes high. When this happens or when
Oscillator clock output goes low, the High-Side
Power Switch turns off and the Low-Side Power
Switch turns on. At this point, the SW side of the
inductor swings to a diode voltage below ground,
causing the inductor current to decrease and
magnetic energy to be transferred to output. This
state continues until the cycle starts again.
The High-Side Power Switch is driven by logic
using internal bootstrap as the positive rail. The pin
is charged to VSW + 6V when the Low-Side Power
Switch turns on.
The COMP voltage is the integration of the error
between FB input and the internal 1.22V reference. If FB
is lower than the reference voltage, COMP tends to go
higher to increase current to the output. Current limit
happens when COMP reaches its maximum clam value
of 2.55V.
The Oscillator normally switches at 380kHz. However,
if FB voltage is less than 0.7V, then the switching frequency
decreases until it reaches a minimum of 80kHz at VFB =
0.5V.
SHUTDOWN CONTROL
The BM1430 has an enable input EN for turning the
IC on or off. When EN is less than 1.8V, the IC is in 55µA low
current shutdown mode and output is discharged through
the Low-Side Power Switch. When EN is higher than
1.85V, the IC is in normal operation mode. EN is internally
pulled up with a 15µA current source and can be left
unconnected for always-on operation. Note that EN is a
low voltage input with a maximum voltage of 10V; it should
never be directly connected to Vin if over 12V input.
THERMAL SHUTDOWN
The BM1430 automatically turns off when its junction
temperature exceeds 140°C.
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BM1430 전자부품, 판매, 대치품
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BM1430
Figure10:
PACKAGE OUTLINE
SOP-8 PACKAGE OUTLINE AND DIMENSIONS
Figure11:
DIMENSION
DIMENSION
IN MILIMETERS IN INCHES
SYMBOL MIN
MAX
MIN MAX
A 1.350 1.750 0.053 0.069
A1 0.100 0.250 0.004 0.010
A2 1.350 1.550 0.053 0.061
B 0.330 0.510 0.013 0.020
C 0.190 0.250 0.007 0.010
D 4.780 5.000 0.188 0.197
E 3.800 4.000 0.150 0.157
E1 5.800 6.300 0.228 0.248
e
1.270 TYP
0.050 TYP
L 0.400 1.270 0.016 0.050
θ 0° 8° 0° 8°
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BM1430

3.0A Step-Down Converter

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