AMC7820YSLASH2K datasheet(18/29 Pages) TI2

18 / 29 page

AMC7820

SBAS231B

www.ti.com

FIGURE 6. Soft Start Function.

TEC

Soft-Start

Controller

DAC0

(12 Bits)

SOFT_START_ENABLE

SOFT_START_CTR

SW4

SW2

SW3

OPA7_IN+

DAC0_OUT

DAC0_OUT_SET

OPA7_OUT

SW2_OUT

OPA7_IN–

OFF

Uni

Bip

OPA7

OPA9

T_SENSE_Voltage

SW2_DISABLE

Unipolar_Bipolar_CTR

2.5V

To TEC

DRIVER

APPLICATION

The AMC7820 can be used to control one CW type laser

diode (or pump laser diode) current and one TEC cooler, two

TEC coolers, or two laser diodes. See Figure 7 for a typical

application to control one pump laser diode and one TEC. A

similar approach can be used to control other CW type laser

diodes.

TEC CONTROL

The TEC control loop is made up of the thermistor current

source, a unity-gain buffer, a thermostat DAC (DAC0), the

TEC integrator (OPA7), the internal TEC SOFT_START_

CONTROLLER, an external thermistor, and an external

TEC Power Current Driver.

The external thermistor is driven by the current from the

thermistor current source. The voltage across the thermistor

represents the actual TEC temperature, and is fed into the

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