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参数资料
| 型号： | 5962-9451203MPX |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 运算放大器 |
| 英文描述： | OP-AMP, 5000 uV OFFSET-MAX, CDIP8 |
| 封装： | CERDIP-8 |
| 文件页数： | 11/11页 |
| 文件大小： | 210K |
| 代理商： | 5962-9451203MPX |
DS4422/DS4424
Two-/Four-Channel, I2C, 7-Bit Sink/Source
Current DAC
_______________________________________________________________________________________
9
Applications Information
Example Calculations
for an Adjustable Power Supply
In this example, the
Typical Operating Circuit is used
as a base to create Figure 3, a DC-DC output voltage
of 2.0V with ±20% margin. The adjustable power sup-
ply has a DC-DC converter output voltage, VOUT, of
2.0V and a DC-DC converter feedback voltage, VFB, of
0.8V. To determine the relationship of R0A and R0B,
start with the equation:
Substituting VFB = 0.8V and VOUT = 2.0V, the relation-
ship between R0A and R0B is determined to be:
R0A
≈ 1.5 x R0B
IOUT0 is chosen to be 100A (midrange source/sink
current for the DS4422/DS4424). Summing the currents
into the feedback node produces the following:
IOUT0 = IR0B - IR0A
Where:
And:
To create a 20% margin in the supply voltage, the value
of VOUT is set to 2.4V. With these values in place, R0B
is calculated to be 2.67k
Ω, and R0A is calculated to be
4.00k
Ω. The current DAC in this configuration allows
the output voltage to be moved linearly from 1.6V to
2.4V using 127 settings. This corresponds to a resolu-
tion of 6.3mV/step.
VCC Decoupling
To achieve the best results when using the DS4422/
DS4424, decouple the power supply with a 0.01F or
0.1F capacitor. Use a high-quality ceramic surface-
mount capacitor if possible. Surface-mount compo-
nents minimize lead inductance, which improves
performance, and ceramic capacitors tend to have
adequate high-frequency response for decoupling
applications.
Power Rail Considerations
Given that the absolute maximum rating for the OUT
pins is VCC + 0.5V, it is recommended that the DS4424
power rail be brought up before or at the same time as
the power rail of the source it is controlling.
I
VV
R
R0A
OUT
FB
0A
=
I
V
R
R0B
FB
0B
=
V
R
RR
FB
0B
0A +
0B
OUT
=× V
DC-DC
CONVERTER
FB
OUT
SDA
SCL
A0
A1
OUT0
GND
*VOUT AND VFB VALUES ARE DETERMINED BY THE DC-DC CONVERTER AND SHOULD NOT BE CONFUSED WITH VOUT AND VRFS OF THE DS4422/DS4424.
RFS0 = 80k
Ω
4.7k
Ω
4.7k
Ω
VCC
VOUT* = 2.0V
VFB* = 0.8V
FS0
R0B= 2.67k
Ω
R0A = 4.00k
Ω
DS4422/
DS4424
I0A
I0B
IOUT0
Figure 3. Example Application Circuit
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