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TPS658620ZQZT датащи(PDF) 68 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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3.57.2 PEAK CURRENT CONTROL (BOOST CONVERTER)
SM3
P(typ)
MAX(L3)
V
I
= I
+
100 ns
L
´
(3-6)
3.57.3 SOFTSTART
3.57.4 ENABLING THE SM3 CONVERTER
TPS658620
Advanced Power Management Unit
SLVS993 – OCTOBER 2009
www.ti.com
Figure 3-19. SM3 Duty Cycle Example
The repetition period can be set using control bits SM3_PRESCn in the register SM3_SET1 to either
220/275/366/550 Hz (HI). Each repetition period has a total of 2048 steps, enabling a resolution of 0.05%
when programming the duty cycle.
The SM3 integrated power stage switch is turned on until the inductor current reaches the DC current limit
IMAX(L3) (500 mA or 300mA, typ), selectable via bit SM3_ILIM , register SM3_SET1. Due to internal delays,
typically around 100ns, the actual current exceeds the DC current limit threshold by a small amount. The
typical peak current limit can be calculated as follows:
The peak current will be directly proportional to the input voltage and inversely proportional to the inductor
value. The internal current limit may be set to either 300mA or 500mA via I2C.
Note that under PWM operation the slew rate of the converter output (SM3) is dependent of the IMAX(L3)
value selected.
All inductive step-up converters exhibit high in-rush current during start-up. If no special precautions are
taken voltage drops can be observed at the input supply rail during start-up, with unpredictable results in
the overall system operation.
The SM3 boost converter limits the inrush current during start-up by increasing the current limit in two
steps, starting from IMAX(L3) /4 for 256 power stage switch cycles (1cycle=power stage switch
OFF
→ON→OFF) to I
MAX(L3) /2 for the next 256 power stage switch cycles and then full current limit
IMAX(L3). The softstart function can be disabled via control bit SM3SOFTOFF, in register SM3_SET1.
The converter is enabled when an I2C command sets the duty cycle to a value different than zero.
DETAILED DESCRIPTION
68
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