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TPS6209733RWKT Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS6209733RWKT
Description  TPS62097 2-A High Efficiency Step-Down Converter with iDCS-Control, Forced PWM Mode and Selective Switching Frequency
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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TPS62097
SLVSCD6 – DECEMBER 2015
www.ti.com
8.3 Feature Description
8.3.1 100% Duty Cycle Mode
The device offers a low input to output voltage dropout by entering 100% duty cycle mode, when the input
voltage reaches the level of the output voltage. In this mode the high-side MOSFET switch is constantly turned
on and the low-side MOSFET is switched off. The minimum input voltage to maintain output regulation,
depending on the load current and output voltage, is calculated as:
VIN(min) = VOUT(min) + IOUT x (RDS(on) + RL)
where
VIN(min) = Minimum input voltage to maintain a minimum output voltage
IOUT = Output current
RDS(on) = High side FET on-resistance
RL = Inductor ohmic resistance (DCR)
(1)
When the device operates close to 100% duty cycle mode, the TPS62097 can't enter Power Save Mode
regardless of the load current if the input voltage decreases to typically 15% above the output voltage. The
device maintains output regulation in PWM mode.
8.3.2 Switch Current Limit and Hiccup Short Circuit Protection
The switch current limit prevents the devices from high inductor current and from drawing excessive current from
the battery or input voltage rail. Excessive current might occur with a shorted/saturated inductor or a heavy
load/shorted output circuit condition. If the inductor current reaches the threshold ILIMF, the high-side MOSFET is
turned off and the low-side MOSFET is turned on to ramp down the inductor current. Once this switch current
limit is triggered 32 times, the devices stop switching and enable the output discharge. The devices then
automatically start a new startup after a typical delay time of 100µs has passed. This is HICCUP short circuit
protection and is implemented to reduce the current drawn during a short circuit condition. The devices repeat
this mode until the high load condition disappears.
When the device is in forced PWM mode, the negative current limit of the low-side MOSFET is active. The
negative current limit prevents excessive current from flowing back through the inductor to the input.
8.3.3 Under Voltage Lockout (UVLO)
To avoid mis-operation of the device at low input voltages, an under voltage lockout is implemented, which shuts
down the devices at voltages lower than VUVLO with a hysteresis of 100mV.
8.3.4 Thermal Shutdown
The device goes into thermal shutdown and stops switching once the junction temperature exceeds TJSD. Once
the device temperature falls below the threshold by 20°C, the device returns to normal operation automatically.
8.4 Device Function Modes
8.4.1 Enable and Disable (EN)
The device is enabled by setting the EN pin to a logic High. Accordingly, shutdown mode is forced if the EN pin
is pulled Low with a shutdown current of typically 0.7
μA.
In shutdown mode, the internal power switches as well as the entire control circuitry are turned off. An internal
resistor of 165
Ω discharges the output via the VOS pin smoothly. The output discharge function also works
when thermal shutdown, undervoltage lockout or HICCUP short circuit protection are triggered.
An internal pull-down resistor of 375 k
Ω is connected to the EN pin when the EN pin is Low. The pull-down
resistor is disconnected when the EN pin is High.
8.4.2 Power Save Mode and Forced PWM Mode (MODE)
The MODE pin is a multi-functional pin that allows the device operation in forced PWM mode or PWM/PSM
mode, and to select the PWM switching frequency.
8
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