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参数资料
| 型号： | ADN8830ACPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 20/22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
5V
I OUTA
ADT70
I OUTB
+IN OA
TO THERM_IN
R3
82.5
+IN IA
OUT OA
= 1V @ 25 C
25mV/ C
R3
82.5
4.99k
RGA
RGB
INST
AMP
–IN IA
RTD
R3
1k
1k
GND
SENSE
AGND
OUT IA
–IN OA
1k
5.11k
NOTE: ADDITIONAL PINS OMITTED FOR CLARITY
Figure 22. Using an RTD for Temperature Feedback to the ADN8830
If the voltage at V SY drops below V X , Q1 is turned off and the
VLIM pin will be set to 1.5 V, effectively setting the maximum
voltage across the outputs to 0 V. The voltage divider for V X is
calculated from Equation 43.
TO
TEC
R S
10m
I L
TO
OUT B
AVDD
V HI
200k
AVDD
AVDD
AVDD
R1
3.48k
TO
VLIM
R2
Design Example 5
A maximum output current limit needs to be set at 1.5 A for a
TEC with a maximum voltage rating of 2.5 V. The ADN8830 is
powered from 5 V. The TEC resistance is estimated at 1.67 Ω and
8
AD626
1nF 300k
V X
AD8602
Q1,Q2
FDG6303N
OR
EQUIVA-
LENT
1.47k
efficiency at 85%. Using Equation 43, the voltage drop across
R S will be 8.8 mV when 1.5 A is delivered to the TEC. The trip
voltage V X is set to 4.991 V with R3 = 178 Ω and R4 = 100 k Ω
300k
as shown in Figure 21. To set the output voltage limit to 2.5 V,
the voltage at VLIMIT should be set to 0.875 V according to
TO
VREF
V LO 200k
VLIMIT
(0V TO 1.5V)
Equation 17.
The C1 capacitor is added to smooth the voltage transitions at
VLIM. Once an overcurrent condition is detected, the output
voltage will turn down to 0 V within 30 ms.
For a more exact measurement of the output current, place a
sense resistor in series with the output load, as shown in Figure 23.
The AD626 instrumentation amplifier is set for a gain of 100
with a reference voltage of 2.47 V from VREF. The output of
the AD626 is equal to 100 × R S × I L and is fed to the AD8602,
which is set up as a window comparator. With V X greater than
VLO but less than VHI, VLIM will be pulled down to the volt-
age at VLIMIT. Should V X fall outside the voltage window,
VLIM will be pulled to 1.5 V as in Figure 21. The trip points
should be set according to
Figure 23. High Accuracy Output Current Limit
The upper and lower trip point voltages can be set independently,
allowing different maximum output current limits depending on
the direction of the current. The resistor divider for VHI and
VLO is tapped to VREF to maintain window accuracy with any
changes in VREF. Using the values from Figure 23 with a 5 V
supply, the output current will not exceed 1.5 A in either direction.
Adding the current sensing resistor will slightly reduce efficiency.
The power dissipated by this resistor is D × ITEC2 × R S if the
TEC is heating, or (1–D) × ITEC2 × R S if the TEC is cooling.
Include this when calculating efficiency as described in the
Calculating Power Dissipation and Efficiency section.
VHI = VREF + 100 × R S I LIMIT +
VLO = VREF – 100 × R S I LIMIT –
(44)
–20 –
REV. D
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