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參數(shù)資料
| 型號： | AAT1231ITP-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Step-Up DC/DC Converters for White LED Backlight Applications |
| 中文描述： | 升壓型DC / DC轉(zhuǎn)換器，用于白光LED背光應(yīng)用 |
| 文件頁數(shù)： | 20/27頁 |
| 文件大小： | 1535K |
| 代理商： | AAT1231ITP-T1 |
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AAT1231/1231-1
Step-Up DC/DC Converters for
White LED Backlight Applications
20
1231.2007.01.1.2
Table 5: Recommended Inductors for Various Output Levels (Select I
PEAK
< I
SAT
).
Maximum
DC I
Current (mA)
Part
Number
Inductance
(μH)
DCR
(m
Ω
)
Size (mm)
LxWxH
Manufacturer
Type
Sumida
www.sumida.com
Cooper Electronics
www.cooperet.com
Murata
www.murata.com
CDRH2D11-2R2
2.2
780
78
3.2x3.2x1.2
Shielded
SD3814-2R2
SD3110-2R2
2.2
2.2
1900
910
77
161
4.0x4.0x1.4
3.1x3.1x1.0
Shielded
Shielded
LQH2MCN2R2M02L
2.2
455
440
2.0x1.6x0.7
Shielded
NR3010T-2R2M
2.2
1100
95
3.0x3.0x1.0
Shielded
Chip
Non-Shielded
Shielded
Taiyo Yuden
www.t-yuden.com
CBC2016T2R2M
2.2
750
200
2.0x1.6x1.6
CBC2518T2R2M
2.2
510
90
2.5x1.8x1.8
For a given inductor type, smaller inductor size leads
to an increase in DCR winding resistance and, in
most cases, increased thermal impedance. Winding
resistance degrades boost converter efficiency and
increases the inductor’s operating temperature.
To ensure high reliability, the inductor case temper-
ature should not exceed 100oC. In some cases,
PCB heatsinking applied to the LIN node (non-
switching) can improve the inductor's thermal
capability. PCB heatsinking may degrade EMI per-
formance when applied to the SW node (switching)
of the AAT1231/1231-1.
Shielded inductors provide decreased EMI and may
be required in noise sensitive applications.
Unshielded chip inductors provide significant space
savings at a reduced cost compared to shielded
(wound and gapped) inductors. In general, chip-
type inductors have increased winding resistance
(DCR) when compared to shielded, wound varieties.
Inductor Efficiency Considerations
The efficiency for different inductors is shown in
Figure 7 for six white LEDs in series. Smaller
inductors yield increased DCR and reduced oper-
ating efficiency.
Figure 10: AAT1231/1231-1 Efficiency for
Different Inductor Types (V
IN
= 3.6V;
Six White LEDs in Series).
65
68
71
74
77
80
2
5
8
11
14
17
20
LED Current (mA)
E
Cooper SD3814-2R2 (77m
Ω
)
Cooper SD3110-2R2 (161m
Ω
)
Murata LQH2MCN2R2M02L (440m
Ω
)
P
LOSS(INDUCTOR)
= I
RMS2
· DCR
I
PEAK
3
I
RMS
=
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