Datasheet.kr   

ELM613DA 데이터시트 PDF




ELM Technology에서 제조한 전자 부품 ELM613DA은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 ELM613DA 자료 제공

부품번호 ELM613DA 기능
기능 synchronous step-down DC/DC converter
제조업체 ELM Technology
로고 ELM Technology 로고


ELM613DA 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.



전체 11 페이지수

미리보기를 사용할 수 없습니다

ELM613DA 데이터시트, 핀배열, 회로
ELM613DA 2A, 20V, 550kHz, synchronous step-down DC/DC converter
General description
ELM613DA is 550KHz fixed frequency PWM synchronous step-down regulator. ELM613DA is operated from
4.75V to 20V, the generated output is adjustable from 0.923V to 18V, and the output current can be up to 2A.
The integrated two MOSFET switches is with turn on resistance of 0.085Ω. Current mode control provides fast
transient response and cycle-by-cycle over current protection. The shutdown current is 1μA typical. Adjustable
soft start prevents inrush current at turn on. ELM613DA is with thermal shutdown.
■Features
• Programmable soft start
• Short circuit protection
• Thermal shutdown protection
• Input voltage
: 4.75V to 20V
• Output voltage
: 0.923V to 18V
• Output current
: 2A
• High efficiency
: Max.93%
• Power MOSFET switches : 85mΩ
• Shutdown current
: Typ.1µA
• Fixed frequency
: Typ.550kHz
• Package
: SOP-8
■Application
• Distributed power system
• Network system
• FPGA, DSP, ASIC power supply
• Notebook computer
• Green electronics and appliance
■Maximum absolute ratings
Parameter
Symbol
Limit
VIN power supply voltage
Vin -0.3 to +21
Apply voltage to SW
Vsw -0.3 to Vin+0.3
Apply voltage to BS
Vbs Vsw-0.3 to Vsw+6
Apply voltage to FB
Vfb -0.3 to +6
Apply voltage to COMP
Vcomp
-0.3 to +6
Apply voltage to EN
Ven -0.3 to +6
Apply voltage to SS
Vss -0.3 to +6
Power dissipation
Pd 630
Operating temperature range
Top
-40 to +85
Storage temperature range
Tstg -65 to +150
Caution:Permanent damage to the device may occur when ratings above maximum absolute ones are used.
Unit
V
V
V
V
V
V
V
mW
°C
°C
■Selection guide
ELM613DA-N
Symbol
a
Package
b Product version
c Taping direction
* Taping direction is one way.
D: SOP-8
A
N: Refer to PKG file
ELM613DA - N
↑↑ ↑
ab c
11 - 1
Rev.1.3




ELM613DA pdf, 반도체, 판매, 대치품
ELM613DA 2A, 20V, 550kHz, synchronous step-down DC/DC converter
■Application notes
ELM613DA is synchronous rectified, current-mode, step-down regulator. It regulates input voltages from 4.75V
to 20V down to an output voltage as low as 0.923V, and supplies up to 2A of load current. ELM613DA uses
current-mode control to regulate the output voltage. The output voltage is measured at FB through a resistive
voltage divider and amplified through the internal transconductance error amplifier. The voltage at the COMP
pin is compared to the switch current measured internally to control the output voltage. The converter uses
internal N-Channel MOSFET switches to step-down the input voltage to the regulated output voltage. Since the
high side MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between
SW and BS is needed to drive the high side gate. The boost capacitor is charged from the internal 5V rail when
SW is low. When ELM613DA FB pin exceeds 20% of the nominal regulation voltage of 0.923V, the over
voltage comparator is tripped and the COMP pin and the SS pin are discharged to GND, forcing the high-side
switch off.
1. Pin description
BS: High side gate drive boost input
BS supplies the drive for the high-side N-Channel MOSFET switch. Connect a 0.01μF or greater capacitor
from SW to BS to power the high side switch.
VIN: Power input
VIN supplies the power to the IC, as well as the step-down converter switches. Drive VIN with a 4.75V to 20V
power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
SW: Power switch output
SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output
load. Note that a capacitor is required from SW to BS to power the high-side switch.
GND: Ground
Connect to PCB wiring which is lower than high frequency impedance.
FB: Feedback Input
FB senses the output voltage to regulate that voltage. Drive FB with a resistive voltage divider from the output
voltage. The feedback threshold is 0.923V.
COMP: Compensation node
COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to
compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required.
EN: Enable input
EN is a digital input that turns the regulator on or off. Drive EN high to turn on the regulator, drive it low
to turn it off. If EN pin needs to be pulled-up, EN input current has to be lower than 200μA with R4 (about
100kΩ).
SS: Soft-start control input
SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1μF ca-
pacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected.
2. Setting output voltage
The output voltage is set using a resistive voltage divider from the output voltage to FB pin. The voltage di-
vider divides the output voltage down to the feedback voltage by the ratio:
Vfb = Vout × R2 / (R1 + R2)
11 - 4
Rev.1.3

4페이지










ELM613DA 전자부품, 판매, 대치품
ELM613DA 2A, 20V, 550kHz, synchronous step-down DC/DC converter
In this case, a third pole set by the compensation capacitor (C4) and the compensation resistor (R3) is used to
compensate the effect of the ESR zero on the loop gain. This pole is located at:
fp3 = 1 / (2π × C4 × R3)
The goal of compensation design is to shape the converter transfer function to get a desired loop gain. The sys-
tem crossover frequency where the feedback loop has the unity gain is important. Lower crossover frequencies
result in slower line and load transient responses, while higher crossover frequencies could cause system insta-
bility. A good rule of thumb is to set the crossover frequency below one-tenth of the switching frequency.
To optimize the compensation components, the following procedure can be used.
1) Choose the compensation resistor (R3) to set the desired crossover frequency.
Determine the R3 value by the following equation:
R3 = [ (2π × Cout × fc) / (Gea × Gcs) ] × (Vout/Vfb) < [ (2π × Cout × 0.1 × fs) / (Gea × Gcs) ] × (Vout/Vfb)
Where fC is the desired crossover frequency which is typically below one tenth of the switching frequency.
2) Choose the compensation capacitor (C1) to achieve the desired phase margin. For applications with typical
inductor values, setting the compensation zero, fz1, below one-forth of the crossover frequency provides suffi-
cient phase margin. Determine the C1 value by the following equation:
C1 > 4 / (2π × R3 × fc)
Where R3 is the compensation resistor.
3) Determine if the second compensation capacitor (C4) is required. It is required if the ESR zero of the output
capacitor is located at less than half of the switching frequency, or the following relationship is valid:
1 / (2π × Cout × Resr) < fs/2
If this is the case, then add the second compensation capacitor (C4) to set the pole fP3 at the location of the
ESR zero. Determine the C4 value by the equation:
C4 = (Cout × Resr) / R3
8. External bootstrap diode
An external bootstrap diode may enhance the efficiency of the regulator, the applicable conditions of external
BS diode are:
Vout = 5V or 3.3V, and duty cycle is high: D = Vout/Vin > 65%
In these cases, an external BS diode is recommended from the output of the voltage regulator to BS pin, as
shown in Figure 1.
BS
ELM613DA
SW
External BS
diode IN4148
Cbs
0.1 to 1µF
L
Cout
5V or 3.3V
Figure 1. Add optional external bootstrap diode to enhance efficiency.
The recommended external BS diode is IN4148, and the BS capacitor is 0.1 to 1μF.
11 - 7
Rev.1.3

7페이지


구       성 총 11 페이지수
다운로드[ ELM613DA.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
ELM613DA

synchronous step-down DC/DC converter

ELM Technology
ELM Technology

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵