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| 型号： | ADP1043A-USB-Z |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/72页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD DIG POWER SUPPLY |
| 标准包装： | 1 |
| 附件类型： | 连接 USB 至 I2C 的接收器 |
| 适用于相关产品： | ADP1043A |
| 相关产品： | ADP1043AACPZ-RLDKR-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLCT-ND - IC SECONDARY SIDE CTRLR 32LFCSP ADP1043AACPZ-RLTR-ND - IC SECONDARY SIDE CTRLR 32LFCSP |
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ADP1043A
POWER SUPPLY CALIBRATION AND TRIM
The ADP1043A allows the entire power supply to be calibrated
and trimmed digitally in the production environment. It can
calibrate items such as output voltage and trim for tolerance
errors introduced by sense resistors and resistor dividers, as well
as its own internal circuitry. The part comes factory trimmed,
but it can be retrimmed by the user to compensate for the errors
introduced by external components.
The ADP1043A allows the user enough trim capability to trim
for external components with a tolerance of 0.5% or better. If
the ADP1043A is not trimmed in the production environment,
it is recommended that components with a 0.1% tolerance be
used for the inputs to CS1, CS2, VS1, VS2, VS3+, and VS3? to
meet data sheet specifications.
CS1 TRIM
Using a DC Signal
A known voltage (Vx) is applied at the CS1 pin. The CS1 ADC
should output a digital code equal to Vx/337 μV. The CS1 gain
trim register (Register 0x21) is adjusted until the CS1 ADC
value in Register 0x13 reads the correct digital code.
Using an AC Signal
A known current (Ix) is applied to the PSU input. This current
CS2 Offset Trim
It is important to perform the CS2 offset trim as described in
the following steps.
1. Set the nominal full-scale sense resistor voltage drop in
Register 0x23, Bits[7:6].
2. Set high-side or low-side current sensing in Register 0x24,
Bit 7.
3. Offset errors can be introduced by the external bias
resistors and the internal current sources. Apply no-load
current across the sense resistor. Adjust the CS2 offset trim
value (Register 0x24, Bits[6:0]) until the CS2 value in
Register 0x18 reads as close to 100 decimal as possible.
4. Adjust the CS2 digital trim register (Register 0x25) until
the CS2 value in Register 0x18 reads 0.
The offset trim is now completed, and the ADC code reads 0 if
there is no-load current across the sense resistor.
CS2 Gain Trim
After performing the offset trim, perform the gain trim to
remove any mismatch that is introduced by the sense resistor
tolerance. The ADP1043A can trim for sense resistors with a
tolerance of 1% or better.
passes through a current transformer, a diode rectifier, and an
external resistor (R CS1 ) to convert the current information to a
1.
2.
Apply a known current (I OUT ) across the sense resistor.
Adjust the CS2 gain trim value (Register 0x23, Bits[5:0])
voltage (Vx). This voltage is fed into the CS1 pin. The voltage
(Vx) is calculated as follows:
Vx = Ix × ( n2 / n1 ) × R CS1
where n2 / n1 is the turns ratio of the current transformer.
The CS1 ADC should output a digital code equal to Vx/337 μV.
The CS1 gain trim register (Register 0x21) is adjusted until the
CS1 ADC value in Register 0x13 reads the correct digital code.
As described in the CS1 Pin section, the CS1 ADC has a
frequency response. To achieve more accurate trimming,
the following multiplication factor (M) should be used:
M = (?2 × 10 ?18 × f SW 3 ) + (2 × 10 ?12 × f SW 2 ) + (2 × 10 ?8 × f SW ) + 0.9998
where f SW is the switching frequency of the power supply.
CS2 TRIM
The CS2 trim must compensate for offset and gain errors. The
offset error requires both an analog trim and a digital trim. The
CS2 ADC range does not begin at 0 V but instead begins at
?25 mV to allow it to perform reverse current protection for the
OrFET circuit. Therefore, with ?25 mV at the CS2 input, the ADC
code should read 0. With 0 mV at the CS2 input, the ADC code
should read 100 decimal. For this reason, the analog offset trim
is performed until the CS2 reading equals 100 decimal (not 0).
For this reason, also, the digital trim is required.
until the CS2 value in Register 0x18 reads the value
calculated by the following formula:
CS2 Value = I OUT × 2457 × ( R SENSE / FS )
where:
FS is the full-scale voltage drop.
R SENSE is the sense resistor value.
For example, if I OUT = 4.64 A, R SENSE = 20 mΩ, and
FS = 150 mV, then
CS2 Value = (4.64 A × 2457) × (20 mΩ/150 mV)
CS2 Value = 1520 decimal
The CS2 circuit is now trimmed. After the current sense trim is
performed, the OCP limits and settings should be configured.
VOLTAGE CALIBRATION AND TRIM
The voltage sense inputs are optimized for sensing signals at
1 V and cannot sense a signal greater than 1.5 V. In a 12 V
system, a 12:1 resistor divider is required to reduce the 12 V
signal to below 1.5 V. It is recommended that the output voltage
of the power supply be reduced to 1 V for best performance.
The resistor divider can introduce errors, which need to be
trimmed. The ADP1043A has enough trim range to trim out
errors introduced by resistors with 0.5% tolerance or better.
The ADCs output a digital word of 2643 decimal (0xA53)
when there is exactly 1 V at their inputs.
Rev. 0 | Page 27 of 72
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