Product Description
LM1875 Power Amplifier Module High Voltage and High Current Amplification 55V Peak Motor Drive Amplifier board
LM1875 Power Amplifier Module High Voltage and High Current Amplification 55V Peak Motor Drive Amplifier boardHighlights:
The module is a high-voltage and high-current power amplifier module with a peak voltage of 55Vpp. The power bandwidth is 70KHz and the output power is over 20W. It is suitable for motor drive, horn drive, transformer drive and so on. It can also amplify triangular, sinusoidal and square wave signals.
Shipping list
LM1875 module shipping listPhysical module + PDF schematic diagram + after-sale technical support + electrostatic bag packaging + shockproof foamTips:(1) The module interface of our shop is clear and the performance is stable. Please perform functional verification under the corresponding experimental conditions in conjunction with the schematic diagram provided by our shop.(2) The basic parameters of this module are in the details page, providing PDF information of the module information; engineering documents are not provided, please be clear to the buyer, if there are operational problems, please consult customer service.(3) Buyers, before using the module, please read the details page of this module to understand the power supply and use restrictions, to avoid damage to the module due to improper operation.(4) The modules of our shop are guaranteed to provide real module parameters, functions and pictures, and all modules are tested and shipped.
Module parameters
Module model: LM1875
Module type: low frequency power amplifier
Input signal form: single-ended
Input voltage range: 2Vpp (MAX); generally within the power supply
Module input impedance: 10K ohm
Module supply voltage: ± 8V ～ ± 30V
Module power supply current: ± 4A output current is large, the power supply current is large
Module output impedance: low impedance
Output voltage range: 55Vpp (MAX); in the case of positive and negative 30V power supply
Output current: 4A (MAX)
Output power: 30W (MAX)
Module gain: 44 times; the default gain is 44 times, the first level is 11 times, the second level is 4 times, G1 = R2 / R1 + 1, G2 = R8 / R10 + 1
Input offset voltage: 3mV (MAX)
Input offset drift: 10uV / ℃ (MAX)
Input bias current: 125nA (MAX)
Input voltage noise: 35nV√Hz (1KHz)
Module weight: 125g
Module protection: none; no reverse connection protection, unlimited current protection
Module weight: 125g
Module specifications: 96 * 64 * 42mm; length * width * height-PCB size
Module heating: with heat sink; forced air cooling is required at high current
Module heating factors: the input and output voltage is too large or the module is damaged
Module working temperature: -40 ℃-+ 75 ℃; industrial grade
Module features: positive and negative power LED indication
Applications: small signal amplification, audio signal amplifier, motor drive, servo amplifier, etc.
Module interface type: SMA signal signal input and output, 5.08 blue power card wire holder
Module description
Lm1875 is a single-chip power amplifier product with very low distortion and high quality performance for consumer audio applications. The lm1875 provides 20 watts of power to a 4 - or 8-ohm load on a ± 25V power supply. With 8 ohm load and ± 30V power supply, it can provide more than 30W power. The amplifier is designed to work with a minimum of external components. Equipment overload protection includes internal current limitation and thermal shutdown.
The lm1875 design utilizes advanced circuit technology and processing power to achieve extremely low distortion even at high output power level. Other outstanding features include high gain, fast swing rate and wide power bandwidth, large output voltage swing, large current capacity and very wide power supply range. It is suitable for motor driven horn drive, transformer drive and audio amplifier. It can also amplify triangle wave, sine wave and square wave signals.
(1) The power consumption of the module is large, and the power supply needs to have a certain margin. It is recommended to use a power supply with a current drive capacity greater than twice the output current. The module can only be powered by dual power supplies.
(2) In order to avoid unnecessary interference, it is recommended to use a linear power supply, the power supply cannot exceed 30V.
(3) It is recommended to use the SMA to BNC cable to directly observe the output signal for the output signal. Poor contact or poor quality wires may cause signal attenuation or excessive noise.
(4) The SMA port is not available for power output, and a blue terminal block must be used. The SMA port is for observing the signal and must not overpower.
(5) Due to the large power consumption and heat generation, pay attention to ventilation and heat dissipation for long-term work, and add fans to strengthen heat dissipation if necessary.
(6) Since the module has a fixed magnification and no external protection circuit, it is recommended to confirm the output power and amplitude before loading to avoid damage to the module.
input:Vpp=100mA Freq=1.00KHz
Frequently asked questions
Q: Is the magnification fixed? How to adjust?
A: The default magnification of the module is 44 times. If you need to adjust the magnification, you can only replace the resistor on the board. The resistance package is 0805. The calculation formula is given in the parameter details.
Q: Can the module directly drive the coil?
A: The module can drive the coil, but the internal resistance of the coil is required to be greater than 4 ohms. If it is less than 4 ohms, a series power resistance is required, otherwise the module may be damaged.
Q: Can the module amplify square wave or pulse? What is the module bandwidth?
A: The module can amplify low-frequency square waves or pulses. Because it is an audio amplifier, the total bandwidth is not high. Signals within 100K can be amplified. The module is compatible with DC input.
Q: Can the module be enlarged 1: 1? That is to only amplify the current?
A: The module can support 1: 1 amplification, you need to modify the resistance configuration magnification yourself. It is not recommended to directly configure the op amp follow mode, which is easy to self-excitation. It is recommended to change to resistance attenuation first, and then operation amplification The total gain is only 1.
Q: Why the input sine wave output is square wave? What is the output current? What is the output power?
A: Generally speaking, the input signal is too large, and the op amp is amplified to the cut-off distortion, which is the square wave, or the supply voltage is not enough. Can reduce the input signal and increase the supply voltage to solve. The output current of the module is determined by the output voltage and the load. I = Uout / R. Similarly, the output power P = U * I is also determined by the output voltage and the load resistance. When high power is input, heat dissipation grease and air cooling can be added.
Q: Can I use the second level directly instead of the first level?
A: You can use the second stage directly, but you need to remove the chip of the first stage, and then input the signal from OUT1. Otherwise, the first-level chip will affect the signal input.
About Elecdemo
Elecdemonded in 2015 , Elecdemo is a well-established technology company that integrates supply , R & D , prodund sales , supporting agents , franchises , customization and bulk purchases . We are committed to provid our customers with the best electronic functional module products at the lowest price . We have a professional design and production team to providecustomer service to help our customers greatly improve the efficiency of development，learn and research.
About transpiration:
1. Global shipping, (except for some countriesand APO/ FPO)
2. Import duties: Taxes are not included in theprice or shipping costs. Customs fees are the responsibility of the buyer.
3. If the package is not delivered within 30 days. please contact us. We will help you solve the problem.
About delivery:
1. We will process the order in time after the payment is confirmed. Due to the difference in inventory status and time, we will choose to ship from our first warehouse for fast delivery.
2. We only send to the confirmed order address. Your order address must match your shipping address.
3.Service transit time is provided by the carrier, excluding weekends and holidays. Delivery time may vary, especially on holidays.
About guarantee:
1. manufacturers limited warrantyon defective items(excluding items damagedand/or misused after receipt). The accessory is backed by a 3 month warranty
2. The displayed image is taken in real time, but due to different production batches, thecolor may be different. The picture is for reference only, and the actual object is subjectto the final one
3. The defective item must be reported and reurned within the warranty period(if possible,in the original packaging
4. If the product features do not match the advertisement, we will bear all shipping costs.
About feedback:
1. If you are satisfied, please leave 5 stars positive feedback, we are very honored to receivea generous real assessment and photos, th !!!!
2. For any product or shipping problems, please contact us before opening a dispute orleaving any feedback/negative feedback, we will try our best to solve the problem untilyou are satisfied.
Returns and refunds:
1. You have 7 days to contact us and you will not be able to return from the receipt date after30 days. If the item has been owned by you for more than 7 days, it will be considered usedand we will not refund or replace it. with no exceptions! Return shipping costs are theresponsibility of the buver.
2. All returned items must be in original packaging, you must provide us with a shippingtracking number.
3. If there is a return, please contact us in advance, we will help you solve it. If it cannot besolved online, we will accept your return and refund it to you.
About Prime Living
Prime Living is a Canadian online store offering a carefully selected range of quality products for home, automotive, tools, outdoor living, electronics and more.
We are committed to fast order processing, secure packaging and reliable tracked shipping to provide an excellent shopping experience.
Shipping policy
We carefully handle each order to ensure your package arrives quickly and safely. Please note that factors such as weather, postal traffic, or carrier performance may occasionally cause delays beyond our control.
We provide free shipping and dispatch all orders within 2 business days of payment, often sooner. All shipments are sent via international express air shipping, with a tracking number provided so you can follow your order every step of the way.
. Please provide a physical address, as we do not ship to P.O. Boxes.
Returns
Your satisfaction is important to us. Hexlight offers a 14-day Free return policy: if you are not fully satisfied with your purchase, you may request either a full refund or an exchange. All return shipping costs are fully covered by us.
Condition
Brand New
Shipping
This item is shipped directly from our supplier in China with tracking.