ZHCSHO6 February 2018 XTR305
PRODUCTION DATA.
The OPA output (DRV) can be switched to a high-impedance mode by driving the OD control pin low. This input can be connected to the overtemperature flag, EFOT, and a pullup resistor to protect the IC from over-temperature by disconnecting the load.
The output disable mode can be used to sense and measure the voltage at the IA input pins without loading from the DRV output. This mode allows testing of any voltage present at the I/O connector. However, consider the bias current of the IA input pins.
The digital control inputs, M1 and M2, set the four operation modes of the XTR305 as shown in Table 1. When M1 is asserted low, M2 determines voltage or current mode and the corresponding appropriate current limit (ISC) setting. When M1 is high, the internal feedback connections are opened; IAOUT and IMON are both connected to the output pins; and M2 only determines the current limit (ISC) setting.
M1 and M2 are pulled low internally with 1 μA. Terminate these two pins to avoid noise coupling. Output disable (OD) is internally pulled high with approximately 1 μA. When connecting OD to EFOT, a 2.2-kΩ pullup resistor is recommended.
| M1 | M2 | MODE | DESCRIPTION |
|---|---|---|---|
| L | L | VOUT | Voltage output mode, ISC = 20 mA |
| L | H | IOUT | Current output mode, ISC = 32 mA |
| H | L | Ext | IA and IMON on external pins, ISC = 20 A |
| H | H | Ext | IA and IMON on external pins, ISC = 32 mA |