công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
OP262GP bảng dữ liệu(PDF) 10 Page - Analog Devices |
|
OP262GP bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 16 page OP162/OP262/OP462 –10– REV. D Input Overvoltage Protection The input voltage should be limited to ±6V or damage to the device can occur. Electrostatic protection diodes placed in the input stage of the device help protect the amplifier from static discharge. Diodes are connected between each input as well as from each input to both supply pins as shown in the simplified equivalent circuit in Figure 27. If an input voltage exceeds either supply voltage by more than 0.6 V, or if the differential input voltage is greater than 0.6 V, these diodes begin to ener- gize and overvoltage damage could occur. The input current should be limited to less than 5 mA to prevent degradation or destruction of the device. This can be done by placing an external resistor in series with the input that could be overdriven. The size of the resistor can be calculated by dividing the maximum input voltage by 5 mA. For example, if the differential input voltage could reach 5 V, the external resistor should be 5 V/5 mA = 1 k W. In practice, this resistance should be placed in series with both inputs to balance any offset voltages created by the input bias current. Output Phase Reversal The OP162/OP262/OP462 is immune to phase reversal as long as the input voltage is limited to ±6V. Figure 24 shows a photo of the output of the device with the input voltage driven beyond the supply voltages. Although the device’s output will not change phase, large currents due to input overvoltage could result, damaging the device. In applications where the possibility of an input voltage exceeding the supply voltage exists, over- voltage protection should be used, as described in the previous section. Power Dissipation The maximum power that can be safely dissipated by the OP162/OP262/OP462 is limited by the associated rise in junc- tion temperature. The maximum safe junction temperature is 150 ∞C, and should not be exceeded or device performance could suffer. If this maximum is momentarily exceeded, proper circuit operation will be restored as soon as the die temperature is reduced. Leaving the device in an “overheated” condition for an extended period can result in permanent damage to the device. To calculate the internal junction temperature of the OPx62, the following formula can be used: TJ = PDISS ¥ qJA + TA where: TJ = OPx62 junction temperature; PDISS = OPx62 power dissipation; qJA = OPx62 package thermal resistance, junction-to- ambient; and TA = Ambient temperature of the circuit. The power dissipated by the device can be calculated as: PDISS = ILOAD ¥ (VS – VOUT) where: ILOAD is the OPx62 output load current; VS is the OPx62 supply voltage; and VOUT is the OPx62 output voltage. Figures 30 and 31 provide a convenient way to see if the device is being overheated. The maximum safe power dissipation can be found graphically, based on the package type and the ambi- ent temperature around the package. By using the previous equation, it is a simple matter to see if PDISS exceeds the device’s power derating curve. To ensure proper operation, it is impor- tant to observe the recommended derating curves shown in Figures 30 and 31. AMBIENT TEMPERATURE – C 2.0 1.5 0 –40 120 –20 0 20 40 60 80 100 1.0 0.5 8-PIN SOIC PACKAGE 8-PIN TSSOP PACKAGE Figure 30. Maximum Power Dissipation vs. Temperature for 8-Pin Package Types AMBIENT TEMPERATURE – C 2.0 1.5 0 –40 120 –20 0 20 40 60 80 100 1.0 0.5 14-PIN SOIC PACKAGE 14-PIN TSSOP PACKAGE Figure 31. Maximum Power Dissipation vs. Temperature for 14-Pin Package Types Unused Amplifiers It is recommended that any unused amplifiers in a dual or a quad package be configured as a unity gain follower with a 1 k W feedback resistor connected from the inverting input to the output and the noninverting input tied to the ground plane. Power On Settling Time The time it takes for the output of an op amp to settle after a supply voltage is delivered can be an important consideration in some power-up sensitive applications. An example of this would be in an A/D converter where the time until valid data can be produced after power-up is important. The OPx62 family has a rapid settling time after power-up. Figure 32 shows the OP462 output settling times for a single supply voltage of VS = +5 V. The test circuit in Figure 33 was used to find the power on settling times for the device. |
Số phần tương tự - OP262GP |
|
Mô tả tương tự - OP262GP |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |