TSZ182 datasheet(24/39 Pages) STMICROELECTRONICS

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Application information

TSZ182

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DocID029836 Rev 1

The Riso also modifies the open loop gain of the circuit, and tends to improve the phase

margin as described in Table 6: "Riso impact on stability".

Table 6: Riso impact on stability

Capacitive load

100 pF

1 nF

10 nF

100 nF

1 µF

Riso (Ω)

100

Measured overshoot (%)

20.9

Estimated phase margin (°)

5.7

PCB layout recommendations

Particular attention must be paid to the layout of the PCB tracks connected to the amplifier,

load and power supply. It is good practice to use short and wide PCB traces to minimize

voltage drops and parasitic inductance.

To minimize parasitic impedance over the entire surface, a multi-via technique that

connects the bottom and top layer ground planes together in many locations is often used.

The copper traces that connect the output pins to the load and supply pins should be as

wide as possible to minimize trace resistance.

A ground plane generally helps to reduce EMI, which is why it is generally recommended to

use a multilayer PCB and use the ground plane as a shield to protect the internal track. In

this case, pay attention to separate the digital from the analog ground and avoid any

ground loop.

Place external components as close as possible to the op amp and keep the gain

resistances, Rf and Rg, close to the inverting pin to minimize parasitic capacitances.

5.8

Optimized application recommendation

The TSZ182 is based on a chopper architecture. As the device includes internal switching

circuitry, it is strongly recommended to place a 0.1 µF capacitor as close as possible to the

supply pins.

A good decoupling has several advantages for an application. First, it helps to reduce

electromagnetic interference. Due to the modulation of the chopper, the decoupling

capacitance also helps to reject the small ripple that may appear on the output.

The TSZ182 has been o

ptimized for use with 10 kΩ in the feedback loop. With this, or a

higher value resistance, this device offers the best performance.

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