参数资料
| 型号： | ADP1048-600-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/84页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ADP1048-600 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，功率因数校正 |
| 已用 IC / 零件： | ADP1048 |
| 主要属性： | 600W，385V 输出，85~265VAC 输入 |
| 已供物品： | 板 |
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ADP1047/ADP1048
CONTROLLER ARCHITECTURE
The ADP1047 / ADP1048 integrate the following functions:
Data Sheet
The output of the Σ-Δ ADC is used for the following purposes:
?
?
?
?
?
The output is decimated at the switching frequency for the
control loop. The effective number of bits (ENOB) is >7
when the current loop bandwidth is 10 kHz; the ENOB
is >10 when the current loop bandwidth is 1 kHz.
The 11-bit result is calculated and updated at each half line
Communication section)
This section describes the internal architecture of the chip.
CURRENT SENSE
Current sensing is used for the control, protection, and monitor-
ing of the PFC stage. For normal operation, the power factor
correction control loop requires inductor current information.
The typical implementation uses a sense resistor on the input
bus. A combination of two current transformers in series with
the power switch and the boost diode can be used to reconstruct
the inductor current and minimize losses in the resistive shunt,
but, in general, a good quality shunt resistor provides much
better accuracy in measuring input current and input power.
The inputs to the current sense ADC are differential. A pair of
matched current sources is provided to level shift the negative
signal across the current sense element in the input range of the
current sense ADC (see Figure 7).
I L
cycle for high accuracy ac line current and input power
monitoring and for overcurrent protection (accurate OCP).
RMS INPUT OVERCURRENT PROTECTION
The ADP1047 / ADP1048 provide rms overcurrent protection
(OCP). RMS OCP (or accurate OCP) is distinct from the instan-
taneous pulse-by-pulse fast overcurrent protection and is based
on the rms value of the input ac current.
The measured value is compared to the limit set in the
IIN_OC_FAULT_LIMIT register (Register 0x5B) at the
end of each half cycle of the ac line. If the limit is exceeded,
the action programmed in the IIN_OC_FAULT_RESPONSE
register (Register 0x5C) is triggered.
In addition, an input current warning limit can be programmed
in the IIN_OC_WARN_LIMIT register (Register 0x5D). This
warning limit has no action attached to it, but it sets flags in the
STATUS_BYTE register (Register 0x78, Bit 0), the STATUS_WORD
register (Register 0x79, Bit 13), and the STATUS_INPUT register
(Register 0x7C, Bit 1).
FAST OVERCURRENT PROTECTION (ILIM PIN)
A dedicated current limiting pin (ILIM) is provided to protect
10k ?
CS–
10k ?
CS+
the part from pulse-by-pulse overcurrent events. When the
threshold is crossed, the PWM pulse is terminated. This action
is independent of any programming of the fast OCP flag. The
next switching cycle resumes normally. Additional actions can
+
–
ADC
11-BIT
be programmed (see Table 5).
The OCP comparator on the ILIM pin can accept positive or
negative signals; the pin is referred to PGND (power ground) and
has programmable level shifting current sources (see Table 5).
VDD
ADP1047/ADP1048
These sources can be changed during normal operation to adapt
Figure 7. Current Sense Configuration
The current sense can be calibrated digitally to remove any
the production environment; the settings are saved in the
to the level at which the overcurrent protection is triggered.
The OCP comparator also features programmable blanking and
debounce times (see Table 5). If OCP is triggered, the PWM
signal is terminated and operation resumes at the next switch-
ing cycle unless a different action is specified for the fast OCP
response in Register 0xFE00.
Rev. 0 | Page 12 of 84
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