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| 型号： | ADN8830ACPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/22页 |
| 文件大小： | 0K |
| 描述： | IC THERMO COOLER CNTRLR 32-LFCSP |
| 标准包装： | 1 |
| 应用： | 热电冷却器 |
| 电流 - 电源： | 8mA |
| 电源电压： | 3.3 V ~ 5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 剪切带 (CT) |
| 其它名称： | ADN8830ACPZ-REELCT |
ADN8830
Inductor Select i on
In add i t i on to the external trans i stors, the PWM ampl i f i er requ i res
I L , MAX = I TEC , MAX + 0 . 5 × Δ I L
(24)
an i nductor and a capac i tor at i ts output to f i lter the sw i tched
output waveform . Proper i nductor select i on i s i mportant to
ach i eve the best eff i c i ency . The duty cycle of the PWM sets the
OUT A output voltage and i s
where I L can be found from Equat i on 23 w i th the appropr i ate
duty cycle calculated from Equat i on 22 w i th OUT A = V TEC, MAX .
Des i gn Example 3
A TEC i s spec i f i ed w i th a max i mum current of 1 . 5 A and max i -
D =
OUT A
V DD
(22)
mum voltage of 2 . 5 V . The ADN8830 w i ll be operat i ng from a
3 . 3 V supply voltage w i th a 200 kHz clock and a 4 . 7 μ H i nductor .
The duty cycle of the PWM ampl i f i er at 2 . 5 V i s calculated to be
The average current through the i nductor i s equal to the TEC
current . The r i pple current through the i nductor, I L , var i es
w i th the duty cycle and i s equal to
75 . 8% . Us i ng Equat i on 23, the i nductor r i pple current i s found
to be 664 mA . From Equat i on 24, the max i mum i nductor current
w i ll be 1 . 82 A and should be cons i dered when select i ng the
V DD × D × ( )
Δ I L =
1– D
L × f CLK
(23)
i nductor . Not i ce that i ncreas i ng the clock frequency to 1 MHz would
reduce I L, MAX to 1 . 56 A .
Des i gn Example 4
where f CLK i s the clock frequency as set by the res i stor R FREQ at
P i n 26 or an external clock frequency . Refer to the Sett i ng the
Sw i tch i ng Frequency sect i on for more i nformat i on . Select i ng a
faster sw i tch i ng frequency or a larger value i nductor w i ll reduce
the r i pple current through the i nductor . The waveform of the
i nductor current i s shown i n F i gure 13 .
Us i ng the same TEC as above, the ADN8830 w i ll be powered
from 5 . 0 V i nstead . Here, the duty cycle i s 50%, wh i ch happens
to be the worst-case duty cycle for i nductor current r i pple . Now
DIL equals 1 . 33 A w i th a 200 kHz clock, and I L, MAX i s 2 . 83 A .
Reduc i ng the i nductor r i pple current i s another compell i ng
reason to operate the ADN8830 from a 3 . 3 V supply i nstead .
Table II l i sts some i nductor manufacturers and part numbers
along w i th some key spec i f i cat i ons . The column I MAX refers to the
max i mum current at wh i ch the i nductor i s rated to rema i n l i near .
I TEC
Δ I L
Although h i gher currents can be pushed through the i nductor,
eff i c i ency and r i pple voltage w i ll be dramat i cally degraded .
Th i s i s by no means a complete l i st of manufacturers or i nductors
that can be used i n the appl i cat i on . More i nformat i on on these
i nductors i s ava i lable at the i r webs i tes . Note the trade-offs
between i nductor he i ght, max i mum current, and ser i es res i stance .
Smaller i nductors cannot handle as muèH current and therefore
requ i re h i gher clock speeds to reduce the i r r i pple current . They
also have h i gher ser i es res i stance, wh i ch can lower the overall
eff i c i ency of the ADN8830 .
T=
1
f CLK
TIME
PWM Output F i lter Requ i rements
Figure 13. Current Waveform Through Inductor
It i s i mportant to select an i nductor that can tolerate the max i -
mum poss i ble current that could pass through i t . Most TECs
are spec i f i ed w i th a max i mum voltage and current for proper
and rel i able operat i on . The max i mum i nstantaneous i nductor
current can be found as
The sw i tch i ng of Q1 and Q2 creates a pulse w i dth modulated
(PWM) square wave from 0 V to V DD . Th i s square wave must
be f i ltered suff i c i ently to create a steady voltage that w i ll dr i ve
the TEC . The r i pple voltage across the TEC i s a funct i on of the
i nductor r i pple current, the L-C f i lter cutoff frequency, and the
equ i valent ser i es res i stance (ESR) of the f i lter capac i tor . The
equ i valent c i rcu i t for the PWM s i de i s g i ven i n F i gure 14 .
Table II . Part i al L i st of Inductors and Key Spec i f i cat i ons
Inductance ( H)
4 . 7
4 . 7
4 . 7
4 . 7
4 . 7
4 . 7
4 . 7 *
10
15
47
I MAX (A)
1 . 1
1 . 59
3 . 9
1 . 5
1 . 32
7 . 5
5 . 4
2 . 7
8
4 . 5
R S, TYP (m )
200
55
48
90
56
12
18
80
32
86
He i ght (mm)
1
2
2 . 8
3
3
4 . 5
5 . 2
2 . 8
8
7 . 1
Part Number
LPO1704-472M
A918CY-4R7M
UP2 . 8B-4R7
DO1608C-472
CDRH4D28 4R7
892NAS-4R7M
DO3316P-472
UP2 . 8B-100
DO5022P-153HC
DO5022P-473
Manufacturer
Co i lcraft
Toko
Cooper
Co i lcraft
Sum i da
Toko
Co i lcraft
Cooper
Co i lcraft
Co i lcraft
Webs i te
www . co i lcraft . com
www . toko . com
www . cooperet . com
www . co i lcraft . com
www . sum i da . com
www . toko . com
www . co i lcraft . com
www . cooperet . com
www . co i lcraft . com
www . co i lcraft . com
* Recommend i nductor i n typ i cal appl i cat i on c i rcu i t F i gure 1 .
–14 –
REV. D
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