Datasheet.kr   

BD7673AG 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD7673AG은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 BD7673AG 자료 제공

부품번호 BD7673AG 기능
기능 DC/DC Converter IC
제조업체 ROHM Semiconductor
로고 ROHM Semiconductor 로고


BD7673AG 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 21 페이지수

미리보기를 사용할 수 없습니다

BD7673AG 데이터시트, 핀배열, 회로
Datasheet
PWM Control Type
DC/DC Converter IC for AC/DC Driver
BD7673AG
General Description
BD7673AG is a PWM controller type DC/DC converter
for AC/DC that provides an optimum system for all
products that requires an electrical outlet. This product
supports both isolated and non-isolated devices. IC
enables simple design of low-power electrical
converters. With switching MOSFET and current
detection resistor as external devices, it enables more
freedom in design.
Since the peak current control is utilized, peak current
is controlled in each cycle, application excels wide
bandwidth and transient response.
BD7673AG includes various protective functions such
as soft start function, burst function, per-cycle over
current limiter, VCC overvoltage protection and
overload protection.
An external latch pin (COMP pin) is provided, so that
latch stopping (OFF) can be set by external signals.
This function is available as overheating protection and
over output voltage protection.
The PWM switching frequency is fixed at 65 kHz.
A frequency hopping function is included which contributes
to low EMI.
Key Specifications
Power Supply Voltage range:
8.5V to 25.0V
Operating Current:
Normal: 0.60mA (Typ)
Burst: 0.40mA (Typ)
Oscillation Frequency:
65kHz (Typ)
Operating Temperature range:
-40°C to +85°C
Package
SSOP6
W(Typ) x D (Typ) x H (Max)
2.90mm x 2.80mm x1.25mm
Features
PWM frequency of 65kHz
PWM current mode method
Low circuit current when UVLO is ON
(12μA at VCC=12V)
Low circuit current without load
(Burst operation when load is light)
Built-in SW frequency hopping function
250nsec leading-edge blanking
VCC UVLO / OVP
Per-cycle over current protection circuit
Soft start
Output overload protection (latch protection)
External latch function for COMP pin
(Over heating protection function)
Applications
AC adapters and household appliances (vacuum cleaners,
humidifiers, air cleaners, air conditioners, refrigerators, IH
cooking heaters, rice cookers, etc.)
Typical Application Circuit
F1
ZNR1
FL1
C8
C9
F2
D1 R1
+ C1
Q1
R5
77667733A
C2 R2
D2
R4 D3
+
C3
ZD
C4 R3
R11
D4
+ C5
R6
C7
U1 R7
R9
C6 R8
U2
R10
Figure 1, Application Diagram (12 V 1A Isolated Type)
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product is not designed protection against radioactive rays
1/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002




BD7673AG pdf, 반도체, 판매, 대치품
BD7673AG
Datasheet
Description of Each Block
( 1 ) Start Sequences (Soft Start Operation, Light Load Operation, and Latch Protection for Overload)
Start sequences are shown in Figure 5. This is also shown the operation of latch protection for overload.
See the sections below for detailed descriptions
VH
VCC=13.5V
VCC=7.5V
VCC=7.0V
VCC
FB
Internal REF
Pull Up
Within
250ms
250ms
Vout
Iout
Switing
Switching
Normal Load
Light Load
Over Load
Burst Mode
Soft Start
Switching
Stop
A
BC D
E
F
GH
IJ
Figure 5, Start Sequence Timing Chart
A: Input voltage VH is applied
B: VCC pin voltage rises by being supplied from VH line through start resistor “Rstart” and the IC starts operating when VCC >
VUVLO1 (13.5V Typ).
Switching operation starts when other protection functions are judged as normal.
From startup to be stable output voltage, application should be set to stabilize output voltage during VCC > VUVLO2 (7.5V Typ)
because the VCC pin consumption current causes the VCC voltage drop.
C: Operated soft start function, maximum duty is restricted to 15% during a 1ms period to prevent any excessive rise in voltage
or current. From 1ms to 8ms, maximum duty is restricted to 25%. Maximum duty is restricted to 75% after 8ms.
D: VOUT voltage rises when the switching operation starts.
Once the output voltage starts, it is set to the rated voltage level within the TFOLP period (250ms Typ).
The output voltage is regulated within TFOLP (=250ms Typ) from starting.
E: During Light Load, when FB pin voltage < VBST (=0.3V Typ), Burst method is operated to keep power consumption down.
F: Over Load condition occurs when FB pin voltage > VFOLP1A (=2.8V Typ).
G: When FB pin voltage is at VFOLP1A (= 2.8V Typ) for more than TFOLP (250ms Typ), the overload protection function is triggered
and switching is stopped by LATCH operation. The IC’s internal 250ms timer is reset during the TFOLP period (250ms Typ) if
FB < VFOLP1B even once.
H: VCC voltage is changed from VUVLO1 (13.5V Typ) to VUVLO2 (7.5V Typ) because of switching stop by latch protection. In case
of high VH voltage if VCC voltage is not changed to less than VLATCH (7.0V Typ), IC is not released from latch protection.
I: If the condition which VH voltage is lower continues, VCC voltage is also lower.
When VCC voltage is lower than VLATCH (7.0V Typ), the IC is released from latch protection.
J: Same as B
In Figure 4, start resistor Rstart is needed to start the application.
When the start resistor Rstart value is reduced, standby power is increased and the startup time is shortened.
Conversely, when the start resistor Rstart value is increased, standby power is reduced and the startup time is lengthened.
Standby current is less than 20uA at VCC UVLO is disable, and it can calculate VCC UVLO voltage from VUVLO1=14.5V
(Max).
exStarting resistor Rstart setting method;
Rstart = (VHmin - VUVLO1Max) / IOFFMax
In the case of Vac=100V (-20% of a margin), Rstart requirement can be found by the following formulas:
VHmin =100 × 2 × 0.8 = 113V
Because of VUVLO1 (Max) =14.5V, Rstart (113V - 14.5V) / 20μA4.975M
Start-up time can be found by the following formulas:
Tstart = -Rstart × CVCC × ln (1-VUVLO1/VHmin)
exRstart=3.0M
Rstart resistor loss in this case is : Pd (Rstart) = (VH-VCC)2 / Rstart = (141V - 14.5V)2 / 3.0M = 5.35mW.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
4/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002

4페이지










BD7673AG 전자부품, 판매, 대치품
BD7673AG
Datasheet
( 4 ) Over Current Limiter and Leading Edge Blanking Period
BD7673AG has over current limiter for each switching cycle.
When the CS pin voltage exceeds the VCS voltage (=0.5V Typ), switching is turned OFF.
In addition, when the driver MOSFET is turned ON, surge current occurs at each capacitor component and drive current.
Therefore, when the CS pin voltage rises temporarily, the detection errors may occur in the over current limiter circuit. To
prevent detection errors, the OUT pin is switched from low to high and the CS signal is blanked for 250nsec by the LEB
(Leading Edge Blanking) function. This blanking function enables a reduction of CS pin noise filtering in response to noise
that occurs when the OUT pin is switched from low to high.
( 5 ) Output Overload Protection Function (FB OLP Comparator )
Overload Protection Function monitors the load status of secondary output through FB pin and stops the switching of OUT
pin during excessive load. In over load condition, there is no current in photo-coupler because output voltage decreases
(drops) while FB pin voltage rises.
When FB pin voltage exceeds VFOLP1A (=2.8V Typ) at TFOLP (=250ms Typ) interval continuously, a load is excessive and
OUT pin is fixed to L. The timer of overload protection is reset when FB pin drops further than VFOLP1B (=2.6V Typ) within
TFOLP (=250ms Typ) after exceeding VFOLP1A (=2.8V Typ). Switching functions within this TFOLP (=250ms Typ).
FB voltage, which is pulled up in resistance to IC internal voltage operates from VFOLP1A (=2.8V Typ) or more at start-up. For
this matter, set the start-up time of the secondary output voltage such that the FB voltage is always VFOLP1B (=2.6V Typ) or
less within TFOLP (=250ms Typ) at start-up.
Excessive load is detected and latch stops when TFOLP (=250ms Typ) lapses. Release of latch plugs/unplugs the power
supply and is cancelled when VCC VLATCH (=7.0V Typ).
Figure 9, Overload Protection Latch
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
7/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002

7페이지


구       성 총 21 페이지수
다운로드[ BD7673AG.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
BD7673AG

DC/DC Converter IC

ROHM Semiconductor
ROHM Semiconductor

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