전자부품 데이터시트 검색엔진
  Korean  ▼
ALLDATASHEET.CO.KR

X  

SA08 데이터시트(PDF) 4 Page - Cirrus Logic

부품명 SA08
상세설명  Pulse Width Modulation Amplifiers
Download  5 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

SA08 데이터시트(HTML) 4 Page - Cirrus Logic

  SA08 Datasheet HTML 1Page - Cirrus Logic SA08 Datasheet HTML 2Page - Cirrus Logic SA08 Datasheet HTML 3Page - Cirrus Logic SA08 Datasheet HTML 4Page - Cirrus Logic SA08 Datasheet HTML 5Page - Cirrus Logic  
Zoom Inzoom in Zoom Outzoom out
 4 / 5 page
background image
P r o d u c t I n n o v a t i o n F r o m
SA08
4
SA08U
adjusted so as to
reduce the switch-
ing noise well below
100 mV to prevent
false current limit-
ing. The sum of the
DC level plus the
noise peak will de-
termine the current
limiting value. As
in most switching
circuits it may be
difficult to deter-
mine the true noise
amplitude without
careful attention to
grounding of the oscilloscope probe. Use the shortest possible
ground lead for the probe and connect exactly at the GND
terminal of the amplifier. Suggested starting values are C
FILTER
= .1uF, R
FILTER = 5k .
The required value of R
LIMIT in voltage mode may be cal-
culated by:
R
LIMIT = .1 V / ILIMIT
where R
LIMIT is the required resistor value, and ILIMIT is the
maximum desired current. In current mode the required value
of each R
LIMIT is 2 times this value since the sense voltage is
divided down by 2 (see Figure B). If R
SHDN is used it will further
divide down the sense voltage.The shutdown divider network
will also have an effect on the filtering circuit.
BYPASSING
Adequate bypassing of the power supplies is required for
proper operation. Failure to do so can cause erratic and low
efficiency operation as well as excessive ringing at the out-
puts. The Vs supply should be bypassed with at least a 1µF
ceramic capacitor in parallel with another low ESR capacitor
of at least 10µF per amp of output current. Capacitor types
rated for switching applications are the only types that should
be considered. The bypass capacitors must be physically
connected directly to the power supply pins. Even one inch of
lead length will cause excessive ringing at the outputs. This
is due to the very fast switching times and the inductance of
the lead connection. The bypassing requirements of the Vcc
supply are less stringent, but still necessary. A .1µF to .47µF
ceramic capacitor connected directly to the Vcc pin will suffice.
STARTUPCONDITIONS
The high side of the IGBT output bridge circuit is driven by
bootstrap circuit and charge pump arrangement. In order for
the circuit to produce a 100% duty cycle indefinitely the low
side of each half bridge circuit must have previously been in
the ON condition. This means, in turn, that if the input signal
to the SA08 at startup is demanding a 100% duty cycle, the
output may not follow the command and may be in a tri-state
condition. The ramp signal must cross the input signal at some
point to correctly determine the output state. After the ramp
crosses the input signal level one time, the output state will
be correct thereafter.
GENERAL
Please read Application Note 30 on "PWM Basics". Refer
to Application Note 1 "General Operating Considerations" for
helpful information regarding power supplies, heat sinking
and mounting. Visit www.Cirrus.com for design tools that help
automate pwm filter design;heat sink selection;Apex Precision
Power’s completeApplication Notes library;Technical Seminar
Workbook; and Evaluation Kits.
CLOCKCIRCUITANDRAMPGENERATOR
The clock frequency is internally set to a frequency of ap-
proximately 45kHz. The CLK OUT pin will normally be tied to
the CLK IN pin. The clock is divided by two and applied to an
RC network which produces a ramp signal. An external clock
signal can be applied to the CLK IN pin for synchronization
purposes, but must be 45 kHz +/- 2%.
FLAGOUTPUT
Whenever the SA08 has detected a fault condition, the flag
output is set high (10V). When the programmable low side
current limit is exceeded, the FLAG output will be set high.
The FLAG output will be reset low on the next clock cycle.This
reflects the pulse-by-pulse current limiting feature. When the
internally-set high side current limit is tripped or the thermal
limit is reached, the FLAG output is latched high. See PRO-
TECTION CIRCUITS below.
PROTECTIONCIRCUITS
A fixed internal current limit senses the high side current.
Should either of the outputs be shorted to ground the high side
current limit will latch off the output transistors.The temperature
of the output transistors is also monitored.Should a fault condi-
tion raise the temperature of the output transistors to 165°C
the thermal protection circuit latch off the output transistors.
The latched condition can be cleared by either recycling the
V
cc power or by toggling the I LIMIT/SHDN input with a 10V
pulse. See Figures A and B.The outputs will remain off as long
as the shutdown pulse is high (10V).
CURRENTLIMIT
There are two load current sensing pins, I SENSE A and I
SENSE B. The two pins can be shorted in the voltage mode
connection but both must be used in the current mode connec-
tion (see figuresA and B).It is recommended that R
LIMIT resistors
be non-inductive. Load current flows in the I SENSE pins. To
avoid errors due to lead lengths connect the I LIMIT/SHDN pin
directly to the R
LIMIT resistors (through the filter network and
shutdown divider resis-
tor) and connect the
R
LIMIT resistors directly
to the GND pin.
Switching noise
spikes will invariably
befoundattheISENSE
pins. The noise spikes
could trip the current
limit threshold which
is only 100 mV. R
FILTER
and C
FILTER should be
I SENSE A
I SENSE B
I LIMIT/SHDN R
FILTER
C FILTER
R LIMIT
1N4148
SHUTDOWN
SIGNAL
5K
FIGURE A. CURRENT LIMIT WITH
SHUTDOWN VOLTAGE MODE.
0/10V
I SENSE A
I SENSE B
I LIMIT/SHDN R
FILTER
C FILTER
1N4148
0/10V
SHUTDOWN
SIGNAL
5K
5K
FIGURE B. CURRENT LIMIT WITH
SHUTDOWN CURRENT MODE.
R LIMIT
R LIMIT


유사한 부품 번호 - SA08

제조업체부품명데이터시트상세설명
logo
Cirrus Logic
SA08 APEX-SA08 Datasheet
239Kb / 4P
   PULSE WIDTH MODULATION AMPLIFIERS
logo
Kingbright Corporation
SA08-11CGKWA KINGBRIGHT-SA08-11CGKWA Datasheet
360Kb / 6P
   20.32mm (0.8INCH) SINGLE DIGIT NUMERIC DISPLAY
SA08-11EWA KINGBRIGHT-SA08-11EWA Datasheet
162Kb / 3P
   Standard-Displays
SA08-11EWA KINGBRIGHT-SA08-11EWA Datasheet
186Kb / 4P
   20.32mm (0.8INCH) SINGLE DIGIT NUMERIC DISPLAY
SA08-11GWA KINGBRIGHT-SA08-11GWA Datasheet
162Kb / 3P
   Standard-Displays
More results

유사한 설명 - SA08

제조업체부품명데이터시트상세설명
logo
Cirrus Logic
SA08 APEX-SA08 Datasheet
239Kb / 4P
   PULSE WIDTH MODULATION AMPLIFIERS
MSA240 CIRRUS-MSA240 Datasheet
214Kb / 5P
   Pulse Width Modulation Amplifiers
SA09 CIRRUS-SA09 Datasheet
521Kb / 7P
   Pulse Width Modulation Amplifiers
SA12 CIRRUS-SA12 Datasheet
201Kb / 5P
   Pulse Width Modulation Amplifiers
SA07 APEX-SA07 Datasheet
276Kb / 5P
   PULSE WIDTH MODULATION AMPLIFIERS
SA08 APEX-SA08_06 Datasheet
239Kb / 4P
   PULSE WIDTH MODULATION AMPLIFIERS
SA07 CIRRUS-SA07 Datasheet
524Kb / 7P
   Pulse Width Modulation Amplifiers
SA12 APEX-SA12_07 Datasheet
268Kb / 4P
   PULSE WIDTH MODULATION AMPLIFIERS
SA12 APEX-SA12 Datasheet
244Kb / 4P
   PULSE WIDTH MODULATION AMPLIFIERS
logo
AUK corp
S494P AUK-S494P_1 Datasheet
353Kb / 9P
   Pulse Width Modulation
More results


Html Pages

1 2 3 4 5


데이터시트 다운로드

Go To PDF Page


링크 URL




개인정보취급방침
ALLDATASHEET.CO.KR
ALLDATASHEET 가 귀하에 도움이 되셨나요?  [ DONATE ] 

Alldatasheet는?   |   광고문의   |   운영자에게 연락하기   |   개인정보취급방침   |   링크교환   |   제조사별 검색
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com