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ZHCS161D April 2011 – July 2015 AMC1200

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

DUB|8
- MPDS247D
DWV|8
- MPDS382B

散热焊盘机械数据 (封装 | 引脚)

DUB|8
- QFND302E

订购信息

7 Detailed Description

7.1 Overview

The AMC1200 is a fully-differential precision isolation amplifier. The analog input signal is converted to a digital signal and then transferred across a capacitive isolation barrier. The digital modulation used in the AMC1200 together with the isolation barrier characteristics result in excellent reliability and transient immunity.

After processing the digital signal with a low-pass filter, an analog signal is provided at the outputs. The main building blocks are shown in the Functional Block Diagram section.

The SiO₂-based capacitive isolation barrier supports a high level of magnetic field immunity, as described in application report, ISO72x Digital Isolator Magnetic-Field Immunity (SLLA181), available for download at www.ti.com.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Insulation Characteristics

PARAMETER		TEST CONDITIONS		TYP	MAX	UNIT
V_IORM	Maximum working insulation voltage				1200	V_PEAK
V_PR	Input to output test voltage	Qualification test: after Input/Output Safety Test Subgroup 2/3 V_PR = V_IORM × 1.2, t = 10 s, partial discharge < 5 pC			1140	V_PEAK
		Qualification test: method a, after environmental tests subgroup 1, V_PR = V_IORM × 1.6, t = 10 s, partial discharge < 5 pC			1920	V_PEAK
		100% production test: method b1, V_PR = V_IORM x 1.875, t = 1 s, partial discharge < 5 pC			2250	V_PEAK
V_IOTM	Transient overvoltage	Qualification test: t = 60 s	AMC1200		4000	V_PEAK
V_IOTM	Transient overvoltage	Qualification test: t = 60 s	AMC1200B		4250	V_PEAK
V_ISO	Insulation voltage per UL	Qualification test: V_TEST = V_ISO, t = 60 s	AMC1200		4000	V_PEAK
		Qualification test: V_TEST = V_ISO, t = 60 s	AMC1200B		4250	V_PEAK
		100% production test: V_TEST = 1.2 x V_ISO, t = 1 s	AMC1200		4800	V_PEAK
		100% production test: V_TEST = 1.2 x V_ISO, t = 1 s	AMC1200B		5100	V_PEAK
R_S	Insulation resistance	V_IO = 500 V at T_S		> 10⁹		Ω
PD	Pollution degree			2		°

7.3.2 IEC 61000-4-5 Ratings

PARAMETER		TEST CONDITIONS	VALUE	UNIT
V_IOSM	Surge immunity	1.2-μs/50-μs voltage surge and 8-μs/20-μs current surge	±6000	V

7.3.3 IEC 60664-1 Ratings⁽¹⁾

PARAMETER	TEST CONDITIONS	SPECIFICATION
Basic isolation group	Material group	II
Installation classification	Rated mains voltage ≤ 150 V_RMS	I-IV
	Rated mains voltage ≤ 300 V_RMS	I-IV
	Rated mains voltage ≤ 400 V_RMS	I-III
	Rated mains voltage < 600 V_RMS	I-III

(1) Over operating free-air temperature range (unless otherwise noted).

7.3.4 Package Characteristics⁽¹⁾

PARAMETER		TEST CONDITIONS		MIN	TYP	UNIT
L(I01)	Minimum air gap (clearance)	Shortest terminal to terminal distance through air	DWV package	8		mm
L(I01)	Minimum air gap (clearance)	Shortest terminal to terminal distance through air	DUB package	7		mm
L(I02)	Minimum external tracking (creepage)	Shortest terminal to terminal distance across the package surface	DWV package	8		mm
L(I02)	Minimum external tracking (creepage)		DUB package	7		mm
CTI	Tracking resistance (comparative tracking index)	DIN IEC 60112/VDE 0303 part 1		≥ 400		V
	Minimum internal gap (internal clearance)	Distance through the insulation		0.014		mm
R_IO	Isolation resistance	Input to output, V_IO = 500 V, all pins on each side of the barrier tied together to create a two-terminal device, T_A < 85°C			> 10¹²	Ω
R_IO	Isolation resistance	Input to output, V_IO = 500 V, 85°C ≤ T_A < T_A max			> 10¹¹	Ω
C_IO	Barrier capacitance input to output	V_I = 0.5 V_PP at 1 MHz			1.2	pF
C_I	Input capacitance to ground	V_I = 0.5 V_PP at 1 MHz			3	pF

(1) Creepage and clearance requirements should be applied according to the specific equipment isolation standards of a specific application. Take care to maintain the creepage and clearance distance of the board design to ensure that the mounting pads of the isolator on the printed-circuit-board (PCB) do not reduce this distance. Creepage and clearance on a PCB become equal according to the measurement techniques shown in the TI Isolation Glossary. Techniques such as inserting grooves and/or ribs on the PCB are used to help increase these specifications.

7.3.5 IEC Safety Limiting Values

Safety limiting intends to prevent potential damage to the isolation barrier upon failure of input or output (I/O) circuitry. A failure of the I/O circuitry can allow low resistance to ground or the supply and, without current limiting, dissipate sufficient power to overheat the die and damage the isolation barrier, potentially leading to secondary system failures.

PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
I_S	Safety input, output, or supply current	θ_JA = 246°C/W, V_IN = 5.5 V, T_J = 150°C, T_A = 25°C			10	mA
T_C	Maximum case temperature				150	°C

The safety-limiting constraint is the operating virtual junction temperature range specified in the Absolute Maximum Ratings table. The power dissipation and junction-to-air thermal impedance of the device installed in the application hardware determine the junction temperature. The assumed junction-to-air thermal resistance in the Thermal Information table is that of a device installed in the JESD51-3, Low Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages and is conservative. The power is the recommended maximum input voltage times the current. The junction temperature is then the ambient temperature plus the power times the junction-to-air thermal resistance.

7.3.6 Regulatory Information

VDE/IEC	UL
Certified according to VDE V 0884-10	Recognized under 1577 component recognition program
Certificate number: 40016131	File number: E181974

7.3.7 Isolation Amplifier

The AMC1200 device consists of a second order delta-sigma modulator input stage including an internal reference and clock generator. The output of the modulator and clock signal are differentially transmitted over the integrated capacitive isolation barrier that separates the high- and low-voltage domains. The received bitstream and clock signals are synchronized and processed by a third-order analog filter with a nominal gain of 8 on the low-side and presented as a differential output of the device, as shown in Functional Block Diagram section.

7.3.8 Analog Input

The analog input range is tailored to directly accommodate a voltage drop across a shunt resistor used for current sensing. However, there are two restrictions on the analog input signals, VINP and VINN. If the input voltage exceeds the range AGND – 0.5 V to AVDD + 0.5 V, the input current must be limited to 10 mA to prevent the implemented input protection diodes from damage. In addition, the linearity and the noise performance of the device are ensured only when the differential analog input voltage remains within ±250 mV.

The differential analog input of the AMC1200 and AMC1200B devices is a switched-capacitor circuit based on a second-order modulator stage that digitizes the input signal into a 1-bit output stream. These devices compare the differential input signal (V_IN = VINP – VINN) against the internal reference of 2.5 V using internal capacitors that are continuously charged and discharged with a typical frequency of 10 MHz. With the S1 switches closed, C_IND charges to the voltage difference across VINP and VINN. For the discharge phase, both S1 switches open first and then both S2 switches close. C_IND discharges to approximately AGND + 0.8 V during this phase. Figure 31 shows the simplified equivalent input circuitry.

Figure 31. Equivalent Input Circuit

7.4 Device Functional Modes

The AMC1200 is operational when the power supplies VDD1 and VDD2 are applied as specified in the Recommended Operating Conditions section.

The AMC1200 does not have any additional functional modes.