HCPL-7840-000E Optically Isolated Amplifiers

Technical Specifications of HCPL-7840-000E

Datasheet	HCPL-7840-000E datasheet
Category	Integrated Circuits (ICs)
Family	Linear – Amplifiers – Instrumentation, OP Amps, Buffer Amps
Manufacturer	Broadcom Limited
Series	–
Packaging	Tube
Part Status	Active
Amplifier Type	Isolation
Number of Circuits	1
Output Type	Differential
Slew Rate	–
Gain Bandwidth Product	–
-3db Bandwidth	100kHz
Current – Input Bias	500nA
Voltage – Input Offset	300μV
Current – Supply	10.86mA
Current – Output / Channel	15.5mA
Voltage – Supply, Single/Dual (±)	4.5 V ~ 5.5 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300″, 7.62mm)
Supplier Device Package	8-DIP

HCPL-7840-000E Description

The HCPL-7840-000E is an optocoupler, a type of electronic part used in many electronic applications for signal transmission and electrical separation. This comprehensive handbook details the HCPL-7840 features, 000E’s applications, and technical specifications. Whether you’re an engineer or not, this book will help you understand this adaptable optocoupler’s workings and how to use it effectively in projects.

Product Description

The Broadcom® HCPL-7840 family of isolation amplifiers is designed for electronic motor drives for current sensing. Since this is a typical application, the HCPL-7840 detects the drop in analog voltage from motor currents flowing through an external resistor. A differential output voltage is produced on the HCPL-7840 optical isolation barrier’s other side. This differential output voltage can be converted with an operational amplifier, which, as seen in the recommended application circuit, varies directly with the motor current into a single-ended signal. In the previous statement, the circuit is illustrated. Designed to ignore massive common-mode transient slew rates (at least 10 kV/s), the HCPL-7840 is a special high-voltage transient voltage suppressor. The common-mode voltage fluctuations in switching inverter motor drives typically range from several hundred to zero in a matter of nanoseconds.

With its high CMR capabilities, the HCPL-7840 isolation amplifier guarantees precise motor current monitoring even in harsh environments where external noise levels necessitate more vigilance. This leads to smoother control (reduced torque ripple) in various motor control applications.

Additionally, common analog signal isolation applications can make use of the product. These applications require high precision, stability, and linearity levels while operating in extremely noisy surroundings. Due to its gain tolerance of 5% or less, we advise using the HCPL-7840 for most applications. The HCPL-7840 employs the Broadcom 0.8-um CMOS IC process and chopper stabilized amplifiers, sigma-delta (-) analog-to-digital converter technology, and differential circuit topology. Combined, these features offer unmatched isolation mode noise rejection, outstanding gain and offset precision, and stability across time and temperature. This performance is provided in a tiny, auto-insertable container that is a DIP, has the required number of pins by industry standards and is a DIP. These features all adhere to international safety regulations. (A gull-wing surface mount alternative number 300 is also offered.)

HCPL-7840-000E Features

• Common-mode rejection is 15 kV/s at VCM = 1000V.
• A compact, auto-insertable box with an ordinary 8-pin DIP connector.
• Temperature and gain drift: 0.00025V/V/°C.
• 3 mV input offset voltage and a 100 kHz bandwidth
• 004% nonlinearity.

HCPL-7840-000E Applications

• Rail current and motor phase sensing.
• Current sensing in an inverter.
• Signal isolation for switched-mode power supplies.
• Monitoring and sensing of current for various purposes.
• Separation of analog signals for all purposes.

CAUTION: To prevent any damage, degradation, or both that ESD could cause, take conventional static precautions when handling and assembling this component. The aerospace or military industries are not designed for the uses or circumstances of the components listed in this datasheet. The components are not advised for use in automotive applications and do not meet AEC-Q100 standards.

The layout of a PC board

The PCB design should adhere to sound layout concepts, such as using ground and power planes, separating output signals from input signals, positioning bypass capacitors near supply pins, etc. Additionally, PCB layout can have an adverse effect on stray capacitive coupling between the input and output circuits, which could reduce the isolated transient immunity of the HCPL-7840 (CMTI). Stray coupling can be minimized, allowing for optimal CMTI performance, by keeping the input and output sides of the circuit as far apart as is practical and ensuring that no ground or power plane on the PC board passes directly beneath or much wider than the body of the HCPL-7840.

Sensing Resistors for Current

Low resistance (to minimize power loss), low inductance (to minimize di/dt-induced voltage spikes, which could have a detrimental effect on operation), and an appropriate tolerance are all requirements for the current detecting resistor (to maintain overall circuit accuracy). One must often find a compromise between lowering the quantity of power lost and raising the level of precision when choosing a specific value for the resistor. By using the complete input range that the HCPL-7840 offers, a larger sensing resistance can improve circuit correctness. A reduced sensing resistance, however, will lead to lower power dissipation.

Frequently Asked Questions about the HCPL-7840

1. Why would I use the HCPL-7840 to sense current when there are Hall-effect sensors available that don’t need an isolated supply voltage?

The HCPL-7840 exceeds the majority of Hall-effect sensors in terms of linearity, offset vs. temperature, and Common Mode Rejection. It is available in an auto-insertable 8-pin DIP package (CMR). The supply that powers the gate-drive optocoupler can also be used as the input-side power source.

2. How can I prevent damage to the HCPL-7840 when a short circuit results in a voltage drop across the sense resistor that exceeds the tolerances of the inputs?

The voltage drop across the sensing resistor during a short circuit should be less than 5V. The drive must be turned off before the sensing resistor or solder connections melt; this is the only other step. Thus, if a sense resistor fails open-circuit, the input of the HCPL-7840 is protected.

Conclusion

In conclusion, the HCPL-7840-000E is an outstanding optocoupler device that provides great electrical isolation and signal transmission between circuits. It is reliable and resilient. The HCPL-7840-000E is a flexible component that can be utilized in many electronic systems due to its extensive array of characteristics and applications. This thorough guide has offered a comprehensive overview of the HCPL-7840-000E, including an explanation of its technical specs and a discussion of the possible applications for the product.

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