參數(shù)資料
型號(hào)： IRS2540PBF
廠商： International Rectifier
英文描述： LED BUCK REGULATOR CONTROL IC
中文描述： 發(fā)光二極管降壓穩(wěn)壓器控制IC
文件頁(yè)數(shù)： 9/14頁(yè)
文件大?。?/td> 456K
代理商： IRS2540PBF
IRS254(0,1)(S)PbF
www.irf.com Page 9
Enable Duty Cycle Relationship to Light Output
0
10
20
30
40
50
60
70
80
90
100
0
10
20
30
40
50
60
70
80
90
100
Percentage of Light Output
E
Fig.5 Light Output vs Enable Pin Duty Cycle
Fig.6 IRS254(0,1) Dimming Signals
Open Circuit Protection Mode
By using the suggested
voltage
capacitor, and zener
diode,
the
voltage can be clamped
at any desired value. In
open-circuit
condition
without output clamp,
the
positive
terminal will float at the
high-side
input
Switching
will
between the HO and LO
outputs, whether due to the
output voltage clamp or the watchdog timer.
Transients and switching will be observed at the
positive output terminal as seen in Fig. 8. The
difference in signal shape, between the output
voltage and the I
FB
, is due to the capacitor used to
divider,
output
output
voltage.
still
occur
form the voltage clamp. The repetition of the spikes
can be reduced by simply increasing the capacitor
size.
The two resistors form a voltage divider for the
output, which is then fed into the cathode of the
zener diode. The diode will only conduct, flooding
the enable pin, when its nominal voltage is
exceeded. The chip will enter a disabled state once
the divider network produces a voltage at least 2.5 V
greater than the zener rating. The capacitor serves
only to filter and slow the transients/switching at the
positive output terminal. The clamped output
voltage can be determined by the following analysis.
The choice of capacitor is at the designer’s
discretion.
(
)(
5
1
+
=
R
)
Voltage
Rated
Nominal
Diode
Zener
2
2
=
+
DZ
R
R
DZ
V
V
out
Fig.8 Open Circuit Fault Signals, with Clamp
Under-voltage Lock-out Mode
The under-voltage lock-out mode (UVLO) is defined
as the state IRS254(0,1) is in when V
CC
is below the
turn-on threshold of the IC. During startup
conditions, if the IC supply remains below V
CCUV+
, the
IRS254(0,1) will enter the UVLO mode. This state is
very similar to when the IC has been disabled via
control signals, except that LO is also held low.
When the supply is increased to
V
CCUV+
, the IC enters
the normal operation mode. If already in normal
Fig.7 Open Circuit
Protection Scheme
3
4
I
EN
IFB
Vout
R1
R2
HO
LO
EN
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IRS2540PBF 制造商:International Rectifier 功能描述:LED Driver IC 制造商:International Rectifier 功能描述:IC, LED CURRENT REGULATOR, BUCK, DIP-8
IRS2540SPbF 功能描述:LED照明驅(qū)動(dòng)器 200V HALF BRDG DRVR LED BUCK REGULATOR RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
IRS2540SPBF 制造商:International Rectifier 功能描述:LED Driver IC 制造商:International Rectifier 功能描述:IC, LED CURRENT REGULATOR, BUCK, SOIC-8
IRS2540STRPBF 功能描述:LED照明驅(qū)動(dòng)器 200V Half Bridge LED Driver Buck Regulatr RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
IRS25411 制造商:IRF 制造商全稱:International Rectifier 功能描述:LED BUCK REGULATOR CONTROL IC
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