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L6997STR Datasheet(PDF) 3 Page - STMicroelectronics |
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L6997STR Datasheet(HTML) 3 Page - STMicroelectronics |
3 / 30 page 3/30 L6997S 5VCC IC Supply Voltage. 6 GND Signal ground 7 VREF 0.6V voltage reference. Connect a ceramic capacitor (max. 10nF) between this pin and ground. This pin is capable to source or sink up to 250uA 8 VFB PWM comparator feedback input. Short this pin to INT pin to enable the integrator function, or to VSENSE to disable the integrator function. 9 OSC Connect this pin to the input voltage through a voltage divider in order to provide the feed- forward function don’t leave floating. 10 SS Soft Start pin. A 5 µA constant current charges an external capacitor. Itsvalue sets the soft- start time don’t leave floating. 11 ILIM An external resistor connected between this pin and GND sets the current limit threshold don’t leave floating.. 12 SHDN Shutdown. When connected to GND the device and the drivers are OFF. It cannot be left floating. 13 OVP Open drain output. During the over voltage condition it is pulled up by an external resistor. 14 PGOOD Open drain output. It is pulled down when the output voltage is not within the specified thresholds. Otherwise is pulled up by external resistor. If not used it can be left floating. 15 PGND Low Side driver ground. 16 LGATE Low Side driver output. 17 VDR Low Side driver supply. 18 PHASE Return path of the High Side driver. 19 HGATE High side driver output. 20 BOOT Bootstrap capacitor pin. High Side driver is supplied through this pin. Table 5. Electrical Characteristics (VCC = VDR = 3.3V; Tamb = 0°C to 85°C unless otherwise specified) Symbol Parameter Test Condition Min. Typ. Max. Unit SUPPLY SECTION Vin Input voltage range Vout=Vref Fsw=110Khz Iout=1A 1 35 V VCC, VDR 35.5 V VCC Turn-onvoltage 2.86 2.97 V Turn-off voltage 2.75 2.9 V Hysteresis 90 mV IqVDR Drivers Quiescent Current VFB > VREF 7 20 µA IqVcc Device Quiescent current VFB > VREF 400 600 µA SHUTDOWN SECTION SHDN Device On 1.2 V Device Off 0.6 V ISHVDR Drivers shutdown current SHDN to GND 5 µA ISHVCC Devices shutdown current SHDN to GND 1 15 µA SOFT START SECTION ISS Soft Start current VSS = 0.4V 4 6 µA ∆VSS Active Soft start and voltage 300 400 500 mV Table 4. Pin Function (continued) N° Name Description |
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