ETC MAX16822

19-4141; Rev 2; 5/09
ৰ‫ۇ‬
భᄋ৙ຶ
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
``````````````````````````````````` ᄂቶ
NBY27933B0NBY27933Cဵଢ଼ኹቯੱഗ঱ೡࣞMFE )IC
MFE*དࣅ໭Ljᆐ໱‫ޱ‬ด‫ݝ‬0ᅪ‫ݝ‬ᑍීĂ୐ᓔਜ਼ણஹᑍීĂ
MFEࡾ๵ጲૺ໚჈MFEᑍී።፿ᄋ৙૵௥߅቉ࡼஊ௼ऱ‫ښ‬ă
♦ ঱቉ஊ௼ऱ‫ښ‬
NBY27933B0NBY27933C৔ᔫ᎖,7/6Wᒗ,76Wၒྜྷ࢟ኹ
पᆍLjᔢ঱৔ᔫᆨࣞࡉࡵ,236°DဟLjၒ߲࢟ഗᔢ঱భࡉ
461nBǗᔢ঱৔ᔫᆨࣞࡉࡵ,216°DဟLjၒ߲࢟ഗᔢ঱భࡉ
611nBăၒ߲࢟ഗభᎅ঱‫ܟ‬ଶഗ࢟ᔜࢯஂLjᓜ፿ࡼ൴౑ࢯ
ᒜ)QXN*ၒྜྷభဣሚ౑पᆍࡼ൴ߡါMFEೡࣞࢯஂă
ᑚቋ໭ୈऻ‫ޟ‬း੝ኊገ౑ၒྜྷ࢟ኹपᆍࡼ።፿ă঱‫࢟ܟ‬ഗ
ଶ‫ހ‬ਜ਼ด‫࢟ݝ‬ഗ࿸ᒙ࢟വି࿩೫ᅪ‫ݝ‬Ꮔୈၫ೟Lj݀భᄋ৙
±4&றࣞࡼຳ௿ၒ߲࢟ഗăᏴঌᏲၾ‫ܤ‬ਜ਼QXNೡࣞࢯஂ
ਭ߈ᒦLjᒣૄ఼ᒜႯजۣᑺ೫ᎁፊࡼၒྜྷ࢟Ꮞጴᒜਜ਼౐Ⴅ
ሰ።ቶถăNBY27933Bࡼ࢟ഗᆬ݆ᆐ21&LjऎNBY27933C
ࡼ࢟ഗᆬ݆ᆐ41&ăᑚೝ౒໭ୈࡼఎਈຫൈ঱ࡉ3NI{Lj
࠭ऎᏤ኏ဧ፿ቃߛࡁᏄୈă
NBY27933B0NBY27933Cᄋ৙ෝผೡࣞࢯஂ৖ถLjభଢ଼ࢅ
ၒ߲࢟ഗLjᄰਭᏴUFNQ`JᒗHOEᒄମଝᏲጙവࢅ᎖ด‫ݝ‬
3Wඡሢ࢟ኹࡼᅪ‫ݝ‬ᒇഗ࢟ኹဣሚᑚᒬࢯஂăUFNQ`Jથభ
ሶೌ୻ᏴUFNQ`Jਜ਼HOEᒄମࡼঌᆨࣞᇹၫ)OUD*ེැ࢟
ᔜᏎ߲36μB࢟ഗLjᄋ৙ෝผᑓऩါེۣઐ৖ถLjࡩMFE
ࠈࡼᆨࣞި߲ᒎࢾᆨࣞဟభଢ଼ࢅMFE࢟ഗă
ࠥᅪLj໭ୈથ௥ᎌེਈۣࣥઐ৖ถLjࡩஉᆨިਭ,276°Dဟ
ਈ‫ܕ‬MYདࣅ໭ă
NBY27933B0NBY27933C৔ᔫ᎖.51°Dᒗ,236°D໱‫଀ޱ‬ᆨࣞ
पᆍLj‫ݧ‬፿9፛୭TPॖᓤă
♦ ၒྜྷ࢟ኹपᆍᆐ7/6Wᒗ76W
♦ ၒ߲࢟ഗᔢ঱భࡉ611nB
♦ ຢ࿟ૹ߅76WĂ1/96Ω৖ൈNPTGFU
♦ ᒣૄ఼ᒜǖఎਈຫൈ঱ࡉ3NI{
♦ MFE࢟ഗறࣞǖ±4&
♦ 311nWଶഗ૥ᓰ
♦ ࢟ᔜభ‫ࢾੱࡼ߈ܠ‬MFE࢟ഗ
♦ ૹ߅ࡼ঱‫࢟ܟ‬ഗଶ‫ހ‬
♦ ᑓऩါེۣઐ0ሣቶೡࣞࢯஂ
♦ ਭེਈۣࣥઐ
♦ ‫ݧ‬፿9፛୭TPॖᓤ
♦ .51°Dᒗ,236°D৔ᔫᆨࣞपᆍ
``````````````````````````````` ࢾ৪ቧᇦ
PART
TEMP RANGE
MAX16822AASA+
-40°C to +125°C
PIN-PACKAGE
8 SO
MAX16822BASA+
-40°C to +125°C
8 SO
+‫ܭ‬ာᇄ໺)Qc*0९੝SpIT‫ܪ‬ᓰࡼॖᓤă
``````````````````````````` ࢜ቯ።፿࢟വ
``````````````````````````````````` ።፿
D1
୐ᓔĂ৔ጓૺણஹᑍී
໱‫ޱ‬SDMĂESMਜ਼ᇓࡾ
HB LEDs
VIN
ຳෂመာ໭
RSENSE
L1
ᒎာࡾਜ਼ஜૻူୈࡾ
C2
1
2
CS
IN
C1
3
TEMP_I
MAX16822A
MAX16822B
DIM
GND
LX
PGND
LX
8
7
NTC*
ON
OFF
6
፛୭๼ᒙᏴၫ௣ᓾ೯ࡼᔢઁ৊߲ă
4
5
*OPTIONAL
________________________________________________________________ Maxim Integrated Products
1
‫۾‬ᆪဵNbyjnᑵါ፞ᆪᓾ೯ࡼፉᆪLjNbyjn‫࣪ݙ‬डፉᒦࡀᏴࡼ‫ތ‬ፊ૞ᎅࠥ‫ޘ‬ညࡼࡇᇙঌᐊă༿ᓖፀፉᆪᒦభถࡀᏴᆪᔊᔝᒅ૞
डፉࡇᇙLjྙኊཀྵཱྀྀੜࠤᎫࡼᓰཀྵቶLj༿‫ݬ‬ఠ Nbyjnᄋ৙ࡼ፞ᆪ‫ۈ‬ᓾ೯ă
Ⴣན඾ॅዹອਜ਼ᔢቤ‫ࡼۈ‬ၫ௣ᓾ೯Lj༿षᆰNbyjnࡼᓍ጑ǖdijob/nbyjn.jd/dpnă
NBY27933B0NBY27933C
``````````````````````````````````` গၤ
NBY27933B0NBY27933C
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
ABSOLUTE MAXIMUM RATINGS
IN, CS, LX, DIM to GND .........................................-0.3V to +70V
TEMP_I to GND .......................................................-0.3V to +6V
PGND to GND ......................................................-0.3V to +0.3V
CS to IN .................................................................-0.3V to +0.3V
Maximum Current into Any Pin
(except IN, LX, and PGND).............................................20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 7.4mW/°C above +70°C)...............588.2mW
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)...136°C/W
Pin-to-Pin ESD Ratings......................................................±2.5kV
Operating Temperature Range
350mA (max) Output Current ........................-40°C to +125°C
500mA (max) Output Current ........................-40°C to +105°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, see china.maxim-ic.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +24V, VDIM = VIN, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
Input-Voltage Range
CONDITIONS
MIN
TYP
6.5
VIN
MAX
65
UNITS
V
Ground Current
No switching
1.5
mA
Supply Current
VDIM < 0.6V, VIN = 12V
350
μA
VCS = VIN - 100mV, VIN rising from 4V
until VLX < 0.5VIN
6.25
UNDERVOLTAGE LOCKOUT (UVLO)
Undervoltage Lockout
UVLO
6.5
V
VCS = VIN - 100mV, VIN falling from 6.5V
until VLX > 0.5VIN
6
Undervoltage-Lockout Hysteresis
0.5
V
SENSE COMPARATOR
Sense Voltage Threshold High
Sense Voltage Threshold Low
VSNSHI
VSNSLO
MAX16822A, V IN - VCS rising from
140mV until VLX > 0.5VIN
201
MAX16822B, VIN - VCS rising from 140mV
until VLX > 0.5VIN
218
230
236
MAX16822A, VIN - VCS falling from
260mV until VLX < 0.5VIN
185
190
198
MAX16822B, VIN - VCS falling from
260mV until VLX < 0.5VIN
166
170
180
210
216
mV
mV
Propagation Delay to Output High
tDPDH
Falling edge of VIN - VCS from 140mV to
260mV to VLX > 0.5VIN
50
ns
Propagation Delay to Output Low
tDPDL
Rising edge of VCS - VIN from 260mV to
140mV to VLX < 0.5VIN
50
ns
CS Input Current
ICSIN
VIN - VCS = 200mV
2
_______________________________________________________________________________________
3.5
μA
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
(VIN = +24V, VDIM = VIN, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
VIN = VDIM = 24V, VCS = 23.9V,
ILX = 350mA
0.85
1.7
VIN = VDIM = 6.0V, VCS = 5.9V,
ILX = 350mA
1
2
UNITS
INTERNAL MOSFET
Drain-to-Source Resistance
RDSON
LX Leakage Current
ILX_LEAK
VDIM = 0V, VLX = 65V
10
μA
DIM INPUT
DIM Input-Voltage High
DIM Input-Voltage Low
DIM Turn-On Time
VIH
VIN - VCS = 100mV
VIL
VCS - VIN = 100mV
tDIM_ON
2.8
0.6
VDIM rising edge to VLX < 0.5VIN
DIM Input Leakage Low
V
200
VDIM = VIN
VDIM = 0V
DIM Input Leakage High
V
ns
-3
15
μA
0
μA
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Temperature rising
Thermal-Shutdown Threshold
Hsysteresis
165
°C
10
°C
THERMAL FOLDBACK
Thermal-Foldback Enable
Threshold Voltage
VTFB_ON
VDIM = 5V
Thermal-Foldback Slope
FBSLOPE
VDIM = 5V
TEMP_I Output Bias Current
1.9
2.0
25
26.5
2.12
V
0.75
ITEMP_I
1/V
28
μA
````````````````````````````````````````````````````````````````````````` ࢜ቯ৔ᔫᄂቶ
(VIN = VDIM = 48V, CVCC = 1μF, RSENSE = 0.62Ω, L = 220μH (connected between IN and CS). Typical values are at TA = +25°C,
unless otherwise noted.)
DUTY CYCLE
vs. VIN
90
85
1 LED
80
75
11 LEDs
90
15 LEDs
13 LEDs
80
70
7 LEDs 9 LEDs
5 LEDs
60
50
3 LEDs
1 LED
40
5
15
25
35
VIN (V)
45
55
65
90
13 LEDs
80
9 LEDs
60
7 LEDs
5 LEDs
50
40
30
20
20
10
10
15 LEDs
11 LEDs
70
30
0
70
100
MAX16822A toc03
100
FREQUENCY (kHz)
EFFICIENCY (%)
95
11 LEDs13 LEDs 15 LEDs
DUTY CYCLE (%)
7 LEDs 9 LEDs
5 LEDs
3 LEDs
MAX16822A toc01
100
FREQUENCY
vs. VIN
MAX16822A toc02
EFFICIENCY
vs. VIN
3 LEDs
1 LED
0
5
15
25
35
VIN (V)
45
55
65
5
15
25
35
45
55
65
VIN (V)
_______________________________________________________________________________________
3
NBY27933B0NBY27933C
ELECTRICAL CHARACTERISTICS (continued)
``````````````````````````````````````````````````````````````````` ࢜ቯ৔ᔫᄂቶ)ኚ*
(VIN = VDIM = 48V, CVCC = 1μF, RSENSE = 0.62Ω, L = 220μH (connected between IN and CS). Typical values are at TA = +25°C,
unless otherwise noted.)
QUIESCENT CURRENT
vs. VIN
NORMALIZED ILED
vs. VIN
5 LEDs 7 LEDs
9 LEDs11 LEDs13 LEDs
15 LEDs
3 LEDs
1.00
MAX16822A toc06
MAX16822A toc05
450
QUIESCENT CURRENT (μA)
NORMALIZED ILED
1.05
PWM DIMMING
AT 200Hz DUTY CYCLE (10%)
500
MAX16822A toc04
1.10
1 LED
0.950
400
ILED
200mA/div
350
300
250
0
200
VDIM
5V/div
0
150
100
50
0.90
VIN = 48V
8 LEDs
VDIM = 0V
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65
0 5 10 15 20 25 30 35 40 45 50 55 60 65
VIN (V)
VIN (V)
PWM DIMMING
AT 200Hz DUTY CYCLE (90%)
1ms/div
PWM DIMMING
AT 20kHz DUTY CYCLE (90%)
MAX16822A toc07
MAX16822A toc08
ILED
200mA/div
ILED
200mA/div
0
0
VDIM
5V/div
0
VDIM
5V/div
0
VIN = 48V
8 LEDs
1ms/div
10μs/div
LED CURRENT
vs. VTEMP_I
ILED
vs. TEMPERATURE
450
400
0.4
350
ILED (A)
300
250
200
0.3
0.2
150
100
0.1
50
VIN = 48V
0
0
0
0.4
0.8
1.2
1.6
VTEMP_I (V)
4
MAX16822A toc10
0.5
MAX16822A toc09
500
LED CURRENT (mA)
NBY27933B0NBY27933C
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
2.0
2.4
2.8
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
_______________________________________________________________________________________
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
ITEMP_I
vs. TEMPERATURE
LXRDSON
vs. TEMPERATURE
29.5
29.0
28.5
0.8
VIN = 48V
VIN = 6.5V
0.7
0.6
ITEMP_I (μA)
LXRDSON (Ω)
0.9
30.0
MAX16822A toc12
VIN = 65V
MAX16822A toc11
1.0
28.0
27.5
27.0
26.5
26.0
0.5
25.5
25.0
0.4
VIN = 48V
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
``````````````````````````````````````````````````````````````````````````` ፛୭ႁී
፛୭
෗߂
1
CS
2
IN
3
GND
4
PGND
5, 6
LX
7
DIM
8
TEMP_I
৖ถ
࢟ഗଶ‫ހ‬ၒྜྷăᏴJOਜ਼DTᒄମೌ୻ጙৈ࢟ᔜ࿸ᒙMFE࢟ഗă
ᑵ࢟Ꮞ࢟ኹၒྜྷăᄰਭጙৈ2μG૞ৎࡍࡼ࢟ྏ๬വᒗHOEă
࢐ă
৖ൈ࢐ă
ఎਈஂ࢛ă
൝૷࢟ຳೡࣞࢯஂၒྜྷă౯ࢅEJNਈ‫࢟ܕ‬ഗࢯஂ໭Ǘ౯঱EJNᐌဧถ࢟ഗࢯஂ໭ă
ᑓऩါེۣઐਜ਼ሣቶೡࣞࢯஂၒྜྷăྙਫဧ፿ᑓऩါེۣઐ૞ෝผೡࣞࢯஂLjᐌ፿ጙৈ1/12μG
࢟ྏ๬വᒗHOELj༿‫ݬ‬ఠᑓऩါེۣઐ ‫ݝ‬ॊă
``````````````````````````````` ሮᇼႁී
NBY27933B0NBY27933Cဵଢ଼ኹቯĂੱഗĂ঱ೡࣞMFE )IC
MFE*དࣅ໭ă໭ୈ৔ᔫᏴ,7/6Wᒗ,76Wၒྜྷ࢟ኹपᆍLjᔢ঱
৔ᔫᆨࣞࡉࡵ,216°DဟLjᔢࡍၒ߲࢟ഗᆐ611nBǗᔢ঱
৔ᔫᆨࣞࡉࡵ,236°DဟLjᔢࡍၒ߲࢟ഗᆐ461nBăၒ߲࢟
ഗᎅጙৈ঱‫࢟ܟ‬ഗଶ‫࢟ހ‬ᔜ࿸ᒙLjᓜ፿ࡼQXNೡࣞࢯஂ
ၒྜྷభဣሚ౑ೡࣞपᆍࡼ൴ߡါMFEೡࣞࢯஂă
঱‫࢟ܟ‬ഗଶ‫ހ‬࿸ଐጲૺด‫࢟ݝ‬ഗ࿸ᒙ࢟വࡍࡍି࿩೫
ᅪ‫ݝ‬Ꮔୈၫ೟Lj݀༦ጲ2&றࣞࡼଶഗ࢟ᔜ૾భ૝ࡻ±4&
றࣞࡼMFE࢟ഗLjด‫ݝ‬ऱౖᅄ༿‫ݬ‬ఠᅄ2ă
_______________________________________________________________________________________
5
NBY27933B0NBY27933C
``````````````````````````````````````````````````````````````````` ࢜ቯ৔ᔫᄂቶ)ኚ*
(VIN = VDIM = 48V, CVCC = 1μF, RSENSE = 0.62Ω, L = 220μH (connected between IN and CS). Typical values are at TA = +25°C,
unless otherwise noted.)
NBY27933B0NBY27933C
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
IN
VCC
REGULATOR
MAX16822A
MAX16822B
VCC _ANA
ISET
LX
VCC _ANA
CS
CURRENT-SENSE
COMPARATOR
0.85Ω, 65V
DMOS SWITCH
PWM
DIMMING
1.23V
BANDGAP
REFERENCE
GATE
DRIVER
UVLO
COMPARATOR
DIM
DIM
BUFFER
VCC _ANA
25μA
TEMP_I
PGND
VTFB_ON
2V
THERMAL
FOLDBACK
COMPARATOR
GND
ᅄ2/! ด‫ݝ‬ऱౖᅄ
6
_______________________________________________________________________________________
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
``````````````````````````````` ።፿ቧᇦ
NBY27933B0NBY27933C۞਺ࡒᎌ611nWᒣૄࡼVWMPă
ࡩWJO ሆଢ଼ᒗࢅ᎖6/6Wᒗ7/1WဟLjด‫ݝ‬NPTGFUਈ‫ܕ‬ă
EJNၒྜྷ
ᄰਭᏴEJN፛୭ၒྜྷQXNቧ੓ဣሚMFEೡࣞࢯஂăࢅ᎖
1/7W൝૷࢟ຳࡼEJNၒྜྷ୓NBY27933B0NBY27933Cࡼ
ၒ߲༓ᒜ౯ࢅLj࠭ऎਈ‫ܕ‬MFE࢟ഗăྦኊࡌఎMFE࢟ഗLj
EJN࿟ࡼ൝૷࢟ຳ‫ܘ‬ኍ঱᎖3/9Wă
ེਈࣥ
NBY27933B0NBY27933Cࡼེਈࣥ৖ถᏴஉᆨިਭ,276°D
ဟਈࣥMYདࣅ໭Ljࡩஉᆨଢ଼ᒗਈࣥᆨࣞඡሢጲሆ21°DဟLj
MYདࣅ໭ᒮቤࡌఎă
ෝผೡࣞࢯஂ
NBY27933B0NBY27933Cᄋ৙೫ෝผೡࣞࢯஂ৖ถLjࡩ
UFNQ`Jࡼ࢟ኹࢅ᎖ด‫ݝ‬3Wඡሢ࢟ኹဟLjଢ଼ࢅၒ߲࢟ഗă
NBY27933B0NBY27933CᄰਭUFNQ`Jਜ਼࢐ᒄମೌ୻ࡼᅪ
‫ݝ‬ᒇഗ࢟ኹᏎLj૞36μBด‫࢟ݝ‬ഗᏎᏴUFNQ`Jਜ਼࢐ᒄମೌ
୻ࡼ࢟ᔜ࿟‫ޘ‬ညࡼ࢟ኹဣሚෝผೡࣞࢯஂăࡩUFNQ`J࿟
ࡼ࢟ኹࢅ᎖ด‫ݝ‬3Wඡሢ࢟ኹဟLjNBY27933B0NBY27933C
୓ଢ଼ࢅMFE࢟ഗăෝผೡࣞࢯஂ࢟ഗࡼ࿸ᒙ৛ါྙሆǖ
⎤
⎡
⎛ 1⎞
I TF (A) = ILED (A) × ⎢1 − FB SLOPE ⎜ ⎟ × VTFB _ ON − V A D (V) ⎥
⎝ V⎠
⎦
⎣
(
)
໚ ᒦ Lj W UGC`PO > 3WLj GC TMPQF > 1/86Lj ᎅ Fmfdusjdbm
Dibsbdufsjtujdt ‫ܭ‬૝ࡻLjWBE ᆐUFNQ`J࿟ࡼ࢟ኹă
ᑓऩါེۣઐ
NBY27933B0NBY27933C௥ᎌᑓऩါེۣઐ৖ถLjభᏴ
MFEࠈࡼᆨࣞިਭਖࢾࡼᆨࣞඡሢဟଢ଼ࢅၒ߲࢟ഗăࡩ
OUDེැ࢟ᔜ)ེැ࢟ᔜᎧMFEᒄମኍᄋ৙ੑࡼࡴེᄰവLj
࢟໮ೌ୻ᒙ᎖UFNQ`Jਜ਼࢐ᒄମ*ࡼኹଢ଼ࢅ᎖ด‫ݝ‬3Wඡሢ
ဟLj໭ୈ஠ྜྷᑓऩါེۣઐෝါă
ኡᐋSTFOTF ࿸ᒙMFE࢟ഗ
MFE࢟ഗᎅೌ୻ᏴJOਜ਼DTᒄମࡼଶഗ࢟ᔜ࿸ᒙă‫ݧ‬፿ሆ
ါଐႯ࢟ᔜᒋǖ
R SENSE (Ω) =
1 (VSNSHI + VSNSLO )(V)
2
ILED (A)
໚ᒦLjWTOTIJ ᆐଶ‫࢟ހ‬ኹඡሢࡼ࿟ሢLjWTOTMP ᆐଶ‫࢟ހ‬ኹ
ඡሢࡼሆሢ)௥ᄏၫᒋ༿‫ݬ‬୅ Fmfdusjdbm! Dibsbdufsjtujdt ‫*ܭ‬ă
࢟ഗࢯஂ໭৔ᔫᏇಯ
NBY27933B0NBY27933Cಽ፿ጙৈ௥ᎌᒣૄࡼ‫୷܈‬໭ࢯஂ
MFE࢟ഗ)‫ݬ‬୅ᅄ3*ăࡩ࢟ঢ࢟ഗ࿟ဍLj݀༦ଶ‫࢟ހ‬ᔜೝ࣡
ࡼ࢟ኹࡉࡵ࿟ሢဟLjด‫ݝ‬NPTGFUਈࣥǗࡩᄰਭኚഗऔ૵
਌ࡼ࢟ঢ࢟ഗሆଢ଼Ljᒇࡵଶ‫࢟ހ‬ᔜ࿟ࡼ࢟ኹࢀ᎖ሆሢဟLj
ด‫ݝ‬NPTGFUᏳࠨࡌఎă‫ݧ‬፿ሆါཀྵࢾ৔ᔫຫൈǖ
fSW =
(VIN − nVLED ) × nVLED × R SENSE
VIN × Δ V × L
໚ᒦLjoᆐMFEࡼၫ೟LjWMFE ᆐ2ৈMFEࡼࡴᄰኹଢ଼LjΔW! >
)WTOTIJ .! WTOTMP*ă
࢟ঢኡᐋ
NBY27933B0NBY27933C ࡼఎਈຫൈభࡉ 3NI{ă࣪᎖
హମ၊ሢࡼ።፿Lj‫ݧ‬፿঱ఎਈຫൈᎌಽ᎖ଢ଼ࢅ࢟ঢߛࡁă
‫ݧ‬፿ሆါଐႯࡍগࡼ࢟ঢᒋLjኡᐋᔢᆐ୻தࡼ‫ܪ‬ᓰᒋǖ
L(approx.) =
(VIN − nVLED ) × nVLED × R SENSE
VIN × Δ V × fSW
భಽ፿NBY27933B0C࿸ଐ৔௥ኡᐋᏄୈLjᆀᒍᆐǖdijob/
nbyjn.jd/dpn0NBY27933.tpguxbsfă
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7
NBY27933B0NBY27933C
་ኹჄࢾ)VWMP*
NBY27933B0NBY27933C
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
HYSTERETIC
MODE
fSW
ILED
ΔI
AVG. LED
CURRENT
t
VDIM
t2
t1
t
ᅄ3/! ࢟ഗࢯஂ໭৔ᔫᏇಯ
ኚഗऔ૵਌ࡼኡᐋ
߲᎖ᆮࢾቶਜ਼ᔢଛ቉ൈఠ൅Lj୐ፇ‫ݧ‬፿ᑵሶࡴᄰኹଢ଼ࢅĂ
नሶૂআဟମ౐ࡼࢅ࢟ྏऔ૵਌ăቆᄂ૥औ૵਌ࡼૣࠃ
࢟ኹᔗጲߌ၊ᔢࡍ৔ᔫ࢟ኹLjჅጲဵৈ੪ੑࡼኡᐋă
QDC‫ݚ‬௜ᒎฉ
ᇼᒘࡼ QDC ‫ݚ‬௜ဵ૝ࡻࢅఎਈႼ੒ਜ਼ᆮࢾ৔ᔫࡼਈ୆ă
ᆐ೫૝ࡻৎੑࡼᐅဉጴᒜLj።ক஧೟‫ݧ‬፿ࣶ‫࢟ށ‬വ‫ۇ‬ă
୓ࡍ࢟ഗ୻࢐ૄവĂၒྜྷ๬വ࢟ྏࡼ୻࢐ሣਜ਼ၒ߲൉݆
໭ࡼ୻࢐ሣ࡝࢛ೌ୻)ቩተ୻࢐๼ᒙ*Ljభ୓୻࢐ᐅဉଢ଼ᒗ
8
ᔢቃăᑵ‫ޟ‬৔ᔫဟLjᎌೝৈ࢟Ꮞણവăࡩด‫ݝ‬NPTGFU
ࡌఎဟLjࡍ࢟ഗᄰਭJOĂSTFOTFĂMFEঌᏲĂ࢟ঢĂด‫ݝ‬
NPTGFUਜ਼HOELjተ߅೫ጙৈણവǗࡩด‫ݝ‬NPTGFUਈ‫ܕ‬
ဟLjࡍ࢟ഗᄰਭSTFOTFĂMFEঌᏲĂ࢟ঢਜ਼ኚഗऔ૵਌Lj
ተ߅೫഍ጙৈણവă୓ඛৈણവࡼෂ૩ଢ଼ᒗᔢቃLjጲି
ቃᐅဉছཷă
஧೟ణதDTਜ਼JOहᒙSTFOTFăᆐ೫૝ࡻৎੑࡼᐅဉጴᒜLj
୐ፇᏴDTਜ਼STFOTF ᒄମ‫ݧ‬፿ఎऑᆪೌ୻ă
_______________________________________________________________________________________
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
``````````````````````````````` በຢቧᇦ
PROCESS: BiCMOS
TOP VIEW
+
``````````````````````````````` ॖᓤቧᇦ
CS 1
8
TEMP_I
IN 2
7
DIM
6
LX
ॖᓤಢቯ
ॖᓤ‫ܠ‬൩
ᆪ࡭‫ܠ‬੓
5
LX
8 SO
S8-2
21-0041
GND
3
MAX16822A
MAX16822B
PGND 4
ྙኊᔢதࡼॖᓤᅪተቧᇦLj༿‫އ‬ኯ
china.maxim-ic.com/packagesă
SO
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9
NBY27933B0NBY27933C
``````````````````````````````` ፛୭๼ᒙ
NBY27933B0NBY27933C
3NI{Ă঱ೡࣞMFEདࣅ໭Lj
ૹ߅NPTGFUਜ਼঱‫࢟ܟ‬ഗଶ‫ހ‬
```````````````````````````````````````````````````````````````````````````` ኀࢿ಼ဥ
ኀࢿࠨၫ
ኀࢿ྇໐
ႁී
ኀখ጑
0
5/08
ᔢ߱‫۾ۈ‬ă
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1
6/08
ৎቤ೫ࢾ৪ቧᇦ ‫ܭ‬Ljख‫ݚ‬NBY27933Că
1
2
5/09
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