Driver ICs LED-Beleuchtungstreiber 65V 2A buck LED dri ver with analog or P
TPS922051D2DSGR
Texas Instruments
1:
CHF 0.527
2 895 Auf Lager
Neues Produkt
Mouser-Teilenr.
595-TPS922051D2DSGR
Neues Produkt
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 65V 2A buck LED dri ver with analog or P
2 895 Auf Lager
1
CHF 0.527
10
CHF 0.375
25
CHF 0.337
100
CHF 0.294
3 000
CHF 0.239
6 000
Anzeigen
250
CHF 0.274
500
CHF 0.262
1 000
CHF 0.252
6 000
CHF 0.233
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Buck
2 A
WSON-8
63 V
4.5 V
400 kHz
0 V to 63 V
TPS922051
Cycle-by-cycle over-current protection, Fast load transient support, Integrated Switching FET, LED Open Detection, LED Short Detection, Thermal shutdown
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber 65V 1A boost or buc k-boost LED driver w
TPS923650D1DSGR
Texas Instruments
1:
CHF 0.559
4 402 Auf Lager
Neues Produkt
Mouser-Teilenr.
595-TPS923650D1DSGR
Neues Produkt
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 65V 1A boost or buc k-boost LED driver w
4 402 Auf Lager
1
CHF 0.559
10
CHF 0.398
25
CHF 0.358
100
CHF 0.313
3 000
CHF 0.254
6 000
Anzeigen
250
CHF 0.292
500
CHF 0.279
1 000
CHF 0.268
6 000
CHF 0.248
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost, Buck-Boost
1 A
WSON-8
63 V
4.5 V
1 MHz
5.5 V to 65 V
TPS923650
Cycle-by-cycle over-current protection, Fast load transient support, Integrated Switching FET, LED Open Detection, LED Short Detection, Thermal shutdown
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber 65V 1A boost or buc k-boost LED driver w
TPS923650D2DSGR
Texas Instruments
1:
CHF 0.559
2 935 Auf Lager
Neues Produkt
Mouser-Teilenr.
595-TPS923650D2DSGR
Neues Produkt
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 65V 1A boost or buc k-boost LED driver w
2 935 Auf Lager
1
CHF 0.559
10
CHF 0.398
25
CHF 0.358
100
CHF 0.313
3 000
CHF 0.254
6 000
Anzeigen
250
CHF 0.292
500
CHF 0.279
1 000
CHF 0.268
6 000
CHF 0.248
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost, Buck-Boost
1 A
WSON-8
63 V
4.5 V
1 MHz
5.5 V to 65 V
TPS923650
Cycle-by-cycle over-current protection, Fast load transient support, Integrated Switching FET, LED Open Detection, LED Short Detection, Thermal shutdown
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber 65V 2A boost or buck -boost LED driver w
TPS923651D1DSGR
Texas Instruments
1:
CHF 0.632
2 653 Auf Lager
Neues Produkt
Mouser-Teilenr.
595-TPS923651D1DSGR
Neues Produkt
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 65V 2A boost or buck -boost LED driver w
2 653 Auf Lager
1
CHF 0.632
10
CHF 0.454
25
CHF 0.408
100
CHF 0.358
3 000
CHF 0.292
6 000
Anzeigen
250
CHF 0.333
500
CHF 0.319
1 000
CHF 0.308
6 000
CHF 0.285
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost, Buck-Boost
2 A
WSON-8
63 V
4.5 V
400 kHz
5.5 V to 65 V
TPS923651
- 40 C
+ 85 C
Cycle-by-cycle over-current protection, Fast load transient support, Integrated Switching FET, LED Open Detection, LED Short Detection, Thermal shutdown
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber 65V 2A boost or buck -boost LED driver w
TPS923651D2DSGR
Texas Instruments
1:
CHF 0.632
2 860 Auf Lager
Neues Produkt
Mouser-Teilenr.
595-TPS923651D2DSGR
Neues Produkt
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 65V 2A boost or buck -boost LED driver w
2 860 Auf Lager
1
CHF 0.632
10
CHF 0.454
25
CHF 0.408
100
CHF 0.358
3 000
CHF 0.292
6 000
Anzeigen
250
CHF 0.333
500
CHF 0.319
1 000
CHF 0.308
6 000
CHF 0.285
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost, Buck-Boost
2 A
WSON-8
63 V
4.5 V
400 kHz
5.5 V to 65 V
TPS923651
- 40 C
+ 85 C
Cycle-by-cycle over-current protection, Fast load transient support, Integrated Switching FET, LED Open Detection, LED Short Detection, Thermal shutdown
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber LED Linear Driver W-QFN4040-24/SWP T&R 3K
AL58263QDKZW24-13
Diodes Incorporated
1:
CHF 0.951
2 259 Auf Lager
Neues Produkt
Mouser-Teilenr.
621-AL58263QDKZW2413
Neues Produkt
Diodes Incorporated
Driver ICs LED-Beleuchtungstreiber LED Linear Driver W-QFN4040-24/SWP T&R 3K
2 259 Auf Lager
1
CHF 0.951
10
CHF 0.686
25
CHF 0.621
100
CHF 0.548
3 000
CHF 0.454
6 000
Anzeigen
250
CHF 0.514
500
CHF 0.494
1 000
CHF 0.477
6 000
CHF 0.444
Kaufen
Min.: 1
Mult.: 1
Details
16 Output
Constant Current
60 mA
WQFN-24
5 V
3 V
25 MHz
15 V
AL58263Q
- 40 C
+ 125 C
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber LED MV Int Switch TSOT25 T&R 3K
AL8841WT-7
Diodes Incorporated
1:
CHF 0.316
4 153 Auf Lager
Neues Produkt
Mouser-Teilenr.
621-AL8841WT-7
Neues Produkt
Diodes Incorporated
Driver ICs LED-Beleuchtungstreiber LED MV Int Switch TSOT25 T&R 3K
4 153 Auf Lager
1
CHF 0.316
10
CHF 0.219
25
CHF 0.196
100
CHF 0.17
3 000
CHF 0.142
6 000
Anzeigen
250
CHF 0.157
500
CHF 0.149
1 000
CHF 0.143
6 000
CHF 0.133
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Buck
1.5 A
TSOT25-5
1 MHz
40 V
- 40 C
+ 105 C
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber LED MV Int Switch U-DFN3030-10 T&R 1.5K
AL8866QFN-7
Diodes Incorporated
1:
CHF 0.90
1 445 Auf Lager
Neues Produkt
Mouser-Teilenr.
621-AL8866QFN-7
Neues Produkt
Diodes Incorporated
Driver ICs LED-Beleuchtungstreiber LED MV Int Switch U-DFN3030-10 T&R 1.5K
1 445 Auf Lager
1
CHF 0.90
10
CHF 0.65
25
CHF 0.588
100
CHF 0.518
250
Anzeigen
1 500
CHF 0.437
250
CHF 0.485
500
CHF 0.466
1 000
CHF 0.453
1 500
CHF 0.437
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Buck-Boost, Boost, Buck, SEPIC
U-DFN3030-10
85 V
4.7 V
360 kHz to 440 kHz
85 V
- 40 C
+ 125 C
Overcurrent Limitation Protection
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber Off-Line LED Driver Primary Sensing 800V
HVLED805TR
STMicroelectronics
1:
CHF 1.09
2 208 Auf Lager
Mouser-Teilenr.
511-HVLED805TR
STMicroelectronics
Driver ICs LED-Beleuchtungstreiber Off-Line LED Driver Primary Sensing 800V
2 208 Auf Lager
Alternativverpackung
1
CHF 1.09
10
CHF 0.794
25
CHF 0.72
100
CHF 0.638
2 500
CHF 0.535
5 000
Anzeigen
250
CHF 0.599
500
CHF 0.576
1 000
CHF 0.556
5 000
CHF 0.523
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Flyback
1 A
SOIC-16
23 V
11.5 V
166 kHz
Adjustable
HVLED805
- 25 C
+ 125 C
Integrated MOSFET
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber High power factor flyback controller with constant voltage primary sensing and u
HVLED001BTR
STMicroelectronics
1:
CHF 1.59
2 208 Auf Lager
Mouser-Teilenr.
511-HVLED001BTR
STMicroelectronics
Driver ICs LED-Beleuchtungstreiber High power factor flyback controller with constant voltage primary sensing and u
2 208 Auf Lager
Alternativverpackung
1
CHF 1.59
10
CHF 1.19
25
CHF 1.07
100
CHF 0.961
2 500
CHF 0.796
5 000
Anzeigen
250
CHF 0.907
500
CHF 0.875
1 000
CHF 0.842
5 000
CHF 0.779
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost, Buck, Flyback, SEPIC
SSOP-10
18 V
18 V
Adjustable
HVLED001B
- 40 C
+ 125 C
PWM Dimming, Constant Voltage
Reel, Cut Tape
Driver ICs LED-Beleuchtungstreiber Dual 36V Sync LED Driver w/ I2C
LT3964RUHE-1#TRPBF
Analog Devices
1:
CHF 4.90
763 Auf Lager
Mouser-Teilenr.
584-LT3964RUHE-1TRPB
Analog Devices
Driver ICs LED-Beleuchtungstreiber Dual 36V Sync LED Driver w/ I2C
763 Auf Lager
Alternativverpackung
1
CHF 4.90
10
CHF 3.76
25
CHF 3.48
100
CHF 3.17
250
CHF 3.15
2 500
CHF 2.76
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Buck
QFN-36
36 V
4 V
200 kHz to 2 MHz
LT3964-1
- 40 C
+ 150 C
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
LP5810CDSDR
Texas Instruments
1:
CHF 0.68
5 079 Auf Lager
Mouser-Teilenr.
595-LP5810CDSDR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
5 079 Auf Lager
1
CHF 0.68
10
CHF 0.488
25
CHF 0.439
100
CHF 0.385
250
Anzeigen
250
CHF 0.36
500
CHF 0.345
6 000
CHF 0.308
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Linear
100 uA to 25.5 mA
5.5 V
2.7 V
0 V to 5.5 V
LP5810
- 40 C
+ 85 C
Ultra Low Power Consumption
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
LP5810DDSDR
Texas Instruments
1:
CHF 0.68
4 335 Auf Lager
Mouser-Teilenr.
595-LP5810DDSDR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
4 335 Auf Lager
1
CHF 0.68
10
CHF 0.488
25
CHF 0.439
100
CHF 0.385
3 000
CHF 0.316
6 000
Anzeigen
250
CHF 0.36
500
CHF 0.345
1 000
CHF 0.333
6 000
CHF 0.308
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Linear
100 uA to 25.5 mA
5.5 V
2.7 V
0 V to 5.5 V
LP5810
- 40 C
+ 85 C
Ultra Low Power Consumption
Reel, Cut Tape, MouseReel
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
LP5811AYBHR
Texas Instruments
1:
CHF 1.42
1 964 Auf Lager
Mouser-Teilenr.
595-LP5811AYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
1 964 Auf Lager
1
CHF 1.42
10
CHF 1.05
25
CHF 0.951
100
CHF 0.851
250
Anzeigen
250
CHF 0.795
500
CHF 0.765
1 000
CHF 0.74
3 000
CHF 0.709
6 000
CHF 0.694
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5811
- 40 C
+ 85 C
4 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
LP5811BYBHR
Texas Instruments
1:
CHF 1.42
1 994 Auf Lager
Mouser-Teilenr.
595-LP5811BYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
1 994 Auf Lager
1
CHF 1.42
10
CHF 1.05
25
CHF 0.951
100
CHF 0.851
250
Anzeigen
250
CHF 0.795
500
CHF 0.765
1 000
CHF 0.74
3 000
CHF 0.709
6 000
CHF 0.694
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5811
- 40 C
+ 85 C
4 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
LP5811CYBHR
Texas Instruments
1:
CHF 1.42
2 199 Auf Lager
Mouser-Teilenr.
595-LP5811CYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
2 199 Auf Lager
1
CHF 1.42
10
CHF 1.05
25
CHF 0.951
100
CHF 0.851
250
Anzeigen
250
CHF 0.795
500
CHF 0.765
1 000
CHF 0.74
3 000
CHF 0.709
6 000
CHF 0.694
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5811
- 40 C
+ 85 C
4 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
LP5811DYBHR
Texas Instruments
1:
CHF 1.42
2 235 Auf Lager
Mouser-Teilenr.
595-LP5811DYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4- channel RGBW LED dr
2 235 Auf Lager
1
CHF 1.42
10
CHF 1.05
25
CHF 0.951
100
CHF 0.851
250
Anzeigen
250
CHF 0.795
500
CHF 0.765
1 000
CHF 0.74
3 000
CHF 0.709
6 000
CHF 0.694
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5811
- 40 C
+ 85 C
4 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
LP5812AYBHR
Texas Instruments
1:
CHF 0.951
2 490 Auf Lager
Mouser-Teilenr.
595-LP5812AYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
2 490 Auf Lager
1
CHF 0.951
10
CHF 0.695
25
CHF 0.628
100
CHF 0.556
250
Anzeigen
250
CHF 0.521
500
CHF 0.50
1 000
CHF 0.483
3 000
CHF 0.461
6 000
CHF 0.45
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Buck
400 mA
DSBGA-9
5.5 V
2.7 V
6 MHz
3 V to 5.5 V
LP5812
- 40 C
+ 85 C
Ultra Low Power
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
LP5812BDSDR
Texas Instruments
1:
CHF 0.951
2 506 Auf Lager
Mouser-Teilenr.
595-LP5812BDSDR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
2 506 Auf Lager
1
CHF 0.951
10
CHF 0.695
25
CHF 0.628
100
CHF 0.556
250
Anzeigen
250
CHF 0.521
500
CHF 0.50
1 000
CHF 0.483
3 000
CHF 0.461
6 000
CHF 0.45
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Buck
400 mA
SON-8
5.5 V
2.7 V
6 MHz
3 V to 5.5 V
LP5812
- 40 C
+ 85 C
Ultra Low Power
Driver ICs LED-Beleuchtungstreiber 16 CHANNEL FLEXLED D RIVER
LP5812CYBHR
Texas Instruments
1:
CHF 0.951
2 721 Auf Lager
Mouser-Teilenr.
595-LP5812CYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 16 CHANNEL FLEXLED D RIVER
2 721 Auf Lager
1
CHF 0.951
10
CHF 0.695
25
CHF 0.628
100
CHF 0.556
250
Anzeigen
250
CHF 0.521
500
CHF 0.50
1 000
CHF 0.483
3 000
CHF 0.461
6 000
CHF 0.45
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Buck
400 mA
DSBGA-9
5.5 V
2.7 V
6 MHz
3 V to 5.5 V
LP5812
- 40 C
+ 85 C
Ultra Low Power
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
LP5812DDSDR
Texas Instruments
1:
CHF 0.951
11 576 Auf Lager
Mouser-Teilenr.
595-LP5812DDSDR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 4 CHANNEL FLEXLED DR IVER
11 576 Auf Lager
1
CHF 0.951
10
CHF 0.695
25
CHF 0.628
100
CHF 0.556
250
Anzeigen
250
CHF 0.521
500
CHF 0.50
1 000
CHF 0.483
3 000
CHF 0.482
6 000
CHF 0.46
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Buck
400 mA
SON-8
5.5 V
2.7 V
6 MHz
3 V to 5.5 V
LP5812
- 40 C
+ 85 C
Ultra Low Power
Driver ICs LED-Beleuchtungstreiber 16 CHANNEL FLEXLED D RIVER
LP5812DYBHR
Texas Instruments
1:
CHF 0.951
3 154 Auf Lager
3 000 Auf Bestellung
Mouser-Teilenr.
595-LP5812DYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber 16 CHANNEL FLEXLED D RIVER
3 154 Auf Lager
3 000 Auf Bestellung
1
CHF 0.951
10
CHF 0.695
25
CHF 0.628
100
CHF 0.556
250
Anzeigen
250
CHF 0.521
500
CHF 0.50
3 000
CHF 0.484
6 000
CHF 0.45
Kaufen
Min.: 1
Mult.: 1
Details
4 Output
Buck
400 mA
DSBGA-9
5.5 V
2.7 V
6 MHz
3 V to 5.5 V
LP5812
- 40 C
+ 85 C
Ultra Low Power
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
LP5813AYBHR
Texas Instruments
1:
CHF 1.70
1 923 Auf Lager
Mouser-Teilenr.
595-LP5813AYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
1 923 Auf Lager
1
CHF 1.70
10
CHF 1.25
25
CHF 1.15
100
CHF 1.03
250
Anzeigen
250
CHF 0.961
500
CHF 0.932
1 000
CHF 0.90
3 000
CHF 0.859
6 000
CHF 0.842
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5813
- 40 C
+ 85 C
12 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
LP5813BYBHR
Texas Instruments
1:
CHF 1.70
2 895 Auf Lager
Mouser-Teilenr.
595-LP5813BYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
2 895 Auf Lager
1
CHF 1.70
10
CHF 1.25
25
CHF 1.15
100
CHF 1.03
250
Anzeigen
250
CHF 0.961
500
CHF 0.932
1 000
CHF 0.90
3 000
CHF 0.859
6 000
CHF 0.842
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5813
- 40 C
+ 85 C
12 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
LP5813CYBHR
Texas Instruments
1:
CHF 2.64
2 945 Auf Lager
Mouser-Teilenr.
595-LP5813CYBHR
Texas Instruments
Driver ICs LED-Beleuchtungstreiber Synchronous boost 4 x 3 matrix RGB LED d
2 945 Auf Lager
1
CHF 2.64
10
CHF 1.71
25
CHF 1.57
100
CHF 1.36
250
Anzeigen
250
CHF 1.27
500
CHF 1.11
1 000
CHF 0.932
3 000
CHF 0.859
6 000
CHF 0.842
Kaufen
Min.: 1
Mult.: 1
Details
1 Output
Boost
300 mA
DSBGA-12
5.5 V
500 mV
6 MHz
3 V to 5.5 V
LP5813
- 40 C
+ 85 C
12 LED, Analog/PWM Mixed Dimming, Constant Current, I2C Control, LED Open Detection, LED Short Detection, Programmable Lighting Engines, Thermal shutdown