Datasheet OPA2544 (Texas Instruments) - 8
| Hersteller | Texas Instruments |
| Beschreibung | High-Voltage, High-Current Dual Operational Amplifier |
| Seiten / Seite | 10 / 8 — OUTPUT PROTECTION. UNBALANCED POWER SUPPLIES. 1/2. OPA2544 |
| Dateiformat / Größe | PDF / 112 Kb |
| Dokumentensprache | Englisch |
OUTPUT PROTECTION. UNBALANCED POWER SUPPLIES. 1/2. OPA2544
Textversion des Dokuments
tion should trigger more than 25°C above the maximum OPA2544 are operated within their linear common-mode expected ambient condition of your application. This pro- range, and that the output can swing to 0V. The V+ power duces a junction temperature of 125°C at the maximum supply could range from 15V to 63V. The total voltage expected ambient condition. (V– to V+) can range from 20V to 70V. With a 63V positive Depending on load and signal conditions, the thermal pro- supply voltage, the device may not be protected from dam- tection circuit may produce a duty-cycle modulated output age during short-circuits because of the larger V during CE signal. This limits the dissipation in the amplifier, but the this condition. rapidly varying output waveform may be damaging to some loads. The thermal protection may behave differently de-
OUTPUT PROTECTION
pending on whether internal dissipation is produced by Reactive and EMF-generating loads can return load current sourcing or sinking output current. to the amplifier, causing the output voltage to exceed the power supply voltage. This damaging condition can be
UNBALANCED POWER SUPPLIES
avoided with clamp diodes from the output terminal to the Some applications do not require equal positive and negative power supplies as shown in Figure 2. Fast-recovery rectifier output voltage swing. The power supply voltages of the diodes with a 4A or greater continuous rating are recom- OPA2544 do not need to be equal. For example, a –7V mended. negative power supply voltage assures that the inputs of the R2 V+ 100kΩ 20pF R R R 1 2 G = – = –4 2 R R 5kΩ 20kΩ 1 1 A = –R /R = –10 V 2 1 10kΩ VIN VIN 0.1Ω A D1 L
1/2
Master 10kΩ
OPA2544
D 1Ω 2 Motor Paralleled operation not 20pF 0.01µF recommended for input 0.1Ω signals that can cause V– B amplifiers to slew. D , D : Motorola MUR420 1 2 Fast Recovery Rectifier. Slave FIGURE 3. Motor Drive Circuit. FIGURE 5. Paralleled Operation, Extended SOA. +35V +35V 10kΩ 10kΩ 10kΩ 20kΩ 3nF 30Ω
A B
V 1kΩ IN Load ±10V G = +3 120Vp-p (±60V) G = –1 –35V –35V FIGURE 4. Bridge Drive Circuit. ®
OPA2544
8
OUTPUT PROTECTION
pending on whether internal dissipation is produced by Reactive and EMF-generating loads can return load current sourcing or sinking output current. to the amplifier, causing the output voltage to exceed the power supply voltage. This damaging condition can be
UNBALANCED POWER SUPPLIES
avoided with clamp diodes from the output terminal to the Some applications do not require equal positive and negative power supplies as shown in Figure 2. Fast-recovery rectifier output voltage swing. The power supply voltages of the diodes with a 4A or greater continuous rating are recom- OPA2544 do not need to be equal. For example, a –7V mended. negative power supply voltage assures that the inputs of the R2 V+ 100kΩ 20pF R R R 1 2 G = – = –4 2 R R 5kΩ 20kΩ 1 1 A = –R /R = –10 V 2 1 10kΩ VIN VIN 0.1Ω A D1 L
1/2
Master 10kΩ
OPA2544
D 1Ω 2 Motor Paralleled operation not 20pF 0.01µF recommended for input 0.1Ω signals that can cause V– B amplifiers to slew. D , D : Motorola MUR420 1 2 Fast Recovery Rectifier. Slave FIGURE 3. Motor Drive Circuit. FIGURE 5. Paralleled Operation, Extended SOA. +35V +35V 10kΩ 10kΩ 10kΩ 20kΩ 3nF 30Ω
A B
V 1kΩ IN Load ±10V G = +3 120Vp-p (±60V) G = –1 –35V –35V FIGURE 4. Bridge Drive Circuit. ®
OPA2544
8