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參數資料
| 型號： | IRS2540 |
| 廠商： | International Rectifier |
| 英文描述： | IRPLLED1 High Voltage LED Driver using the IRS2540 |
| 中文描述： | IRPLLED1高電壓LED驅動器采用IRS2540 |
| 文件頁數： | 3/28頁 |
| 文件大?。?/td> | 839K |
| 代理商： | IRS2540 |
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3
RD-0608
www.irf.com
2.
Constant current control
The IRS254(0,1) is a time-delayed hysteretic buck controller. During normal operating conditions the
output current is regulated via the IFB pin voltage, nominal value of 500 mV. This feedback is
compared to an internal high precision band gap voltage reference. An on-board dV/dt filter has also
been used to prevent erroneous transitioning.
Once the supply to the chip reaches V
CCUV+
, the LO output is held high and the HO output is low for a
predetermined period of time. This initiates the charging of the bootstrap capacitor, establishing the
V
BS
floating supply for the high-side output. Then the chip begins toggling HO and LO outputs as
needed to regulate the current. The deadtime of approximately 140 ns between the LO and HO gate
drive signals prevents “shoot-through” and reduce switching losses, particularly at higher frequencies.
L2
1
2
3
4
8
7
6
5
VCC
IFB
LO
VS
HO
VB
COM
M1
M2
CBOOT
DBOOT
RCS
RF
CF
RS1
CVCC1
CVCC2
ROV1
ROV2
CEN
DOV
DEN1
L1
EN
COM
VBUS
COUT
RG1
RG2
VOUT+
VOUT
IC1
CBUS2
RS2
DCLAMP
CBUS1
ENN
ROUT
Fig. 1: IRS254(0,1) Constant Current LED Driver Typical Schematic
(see Fig. 16 for evaluation board schematic)
Note: R
out
is needed only in few applications
Under normal operating conditions, if V
IFB
is below V
IFBTH
, HO is on and the load is receiving current
from V
BUS
. This simultaneously stores energy in the output stage, L
1
and C
OUT
, whilst V
IFB
begins to
increase. Once V
IFB
crosses V
IFBTH
, HO switches off after the delay t
HO,off
. Once HO is off, LO will
turn on after the deadtime, the inductor and output capacitor release the stored energy into the load and
V
IFB
starts decreasing. When V
IFB
crosses V
IFBTH
again, LO switches off after the delay t
LO,off
and HO
switches on after the delay t
HO,on
.
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PDF描述 |
|---|---|
| IRS4426 | DUAL LOW SIDE DRIVER |
| IRS4428SPBF | DUAL LOW SIDE DRIVER |
| IRS4426PBF | DUAL LOW SIDE DRIVER |
| IRS4426S | DUAL LOW SIDE DRIVER |
| IRS4426SPBF | DUAL LOW SIDE DRIVER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| IRS25401 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:LED BUCK REGULATOR CONTROL IC |
| IRS25401PBF | 功能描述:LED照明驅動器 Hysteretic Buck LED Drvr 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS25401PBF | 制造商:International Rectifier 功能描述:IC LED DRVR DIP8 |
| IRS25401SPBF | 功能描述:LED照明驅動器 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| IRS25401STRPBF | 功能描述:LED照明驅動器 Hysteretic Buck LED Drvr 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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