Datasheet

DocID18279 Rev 5 11/37
ST1CC40 Functional description
37
The error amplifier output is compared with the inductor current sense information to
perform PWM control.
5.5 Inhibit
The inhibit block disables most of the circuitry when the INH input signal is low. The current
drawn from the input voltage is 6 µA typical in inhibit mode.
5.6 Thermal shutdown
The shutdown block generates a signal that disables the power stage if the temperature of
the chip goes higher than a fixed internal threshold (150 ± 10 °C typical). The sensing
element of the chip is close to the PDMOS area, ensuring fast and accurate temperature
detection. A 15 °C typical hysteresis prevents the device from turning ON and OFF
continuously during the protection operation.
Table 5. Uncompensated error amplifier characteristics
Description Value
Transconductance 250 µS
Low frequency gain 96 dB
C
C
195 pF
R
C
70 K