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TPS65133_15 Datasheet(PDF) 8 Page - Texas Instruments

No. de pieza TPS65133_15
Descripción Electrónicos  TPS65133 짹5-V, 250-mA Dual-Output Power Supply
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TPS65133_15 Datasheet(HTML) 8 Page - Texas Instruments

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Current
Limit
Boost Converter
Control Logic
SWP
PGND
Oscillator
Short-Circuit
Protection
VREF
Discharge
VPOS
2.9 V to 5.0 V
10 µF
4.7 µH
10 µF
5.0 V, 250 mA
TPS65133
SLVSC01A – JUNE 2013 – REVISED APRIL 2015
www.ti.com
8.3 Feature Description
8.3.1 Boost Converter (VPOS)
The boost converter uses a current-mode topology with synchronous rectification (see Figure 6). The
synchronous rectifier improves efficiency and provides input-output isolation when the converter is disabled.
When the input supply voltage is close 5.0 V, preventing normal boost operation, the synchronous rectifier is
disabled, allowing the output voltage regulation to be maintained (see Operation with VI ≈ VPOS (Diode Mode)).
SPACER
Figure 6. VPOS Boost Converter Internal Block Diagram
8.3.1.1 Switching Frequency (VPOS)
The boost converter switching frequency may vary slightly as the operating conditions change, but is typically
around 1.7 MHz for most operating conditions.
8.3.1.2 Output Voltage (VPOS)
The boost converter's output voltage is factory-programmed to 5.0 V ±1.0% and cannot be changed by the user.
8.3.1.3 Startup (VPOS)
The boost converter starts up as soon as EN=HIGH and the input supply voltage is above the UVLO threshold.
The converter features an integrated soft-start function to control the ramp of its output voltage.
8.3.1.4 Shutdown (VPOS)
The boost converter shuts down when EN=LOW or the input supply voltage falls below the UVLO threshold.
8.3.1.5 Active Discharge (VPOS)
The boost converter output is actively discharged to ground when the converter is disabled (see Figure 8). During
startup, active discharge begins as soon as the input supply voltage is above the UVLO threshold. During
shutdown, active discharge persists until the input supply voltage is too low to support its operation (VI ≈ 1.5 V).
8.3.1.6 Short-Circuit Protection (VPOS)
The boost converter is protected against short-circuits on its output. If a short-circuit condition is detected during
start-up, the converter limits its output current until the short-circuit condition is removed. Note that if a boost
converter short-circuit condition is detected during start-up, the inverting buck-boost converter will not start until
the condition is removed (because the sequencing logic requires VPOS to be in regulation before the inverting
buck-boost converter is started).
8
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