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TPS658620ZQZT датащи(PDF) 67 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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TPS658620ZQZT датащи(HTML) 67 Page - Texas Instruments

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3.57.1 SM3 RAM REGISTERS
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
As the integrated power switch is turned off the external Schottky diode is forward biased, delivering the
stored inductor energy to the output. The main switch remains off until the FB3 pin voltage is below the
internal 250mV reference voltage, when it is turned on again.
This PFM peak current control sets the converter in discontinuous conduction mode (DCM), and the
switching frequency depends on the inductor, input/output voltage and LED current. Lower LED currents
reduce the switching frequency, with high efficiency over the entire LED current range. This regulation
scheme is inherently stable, allowing a wide range for the selection of the inductor and output capacitor.
Table 3-39. SM3 Control
SM3_SET0 [Addr 0x57]
Defaults in BOLD
Bit Number
B7
B6
B5
B4
B3
B2
B1
B0
Bit Name
SM3_SET7
SM3_SET6
SM3_SET5
SM3_SET4
SM3_SET3
SM3_SET2
SM3_SET1
SM3_SET0
Function
SM3 PWM SWITCH DUTY CYCLE
When 0
ADD 0 TO DUTY CYCLE
When 1
ADD 6.25%
ADD 3.125%
ADD 1.5625%
ADD 0.78125%
ADD 0.390%
ADD 0.195%
ADD 0.0976%
ADD 0.048%
SM3_SET1 [Addr 0x58]
Defaults in BOLD
Bit Number
B7
B6
B5
B4
B3
B2
B1
B0
Bit Name
SM3SOFTOFF
SM3_ILIM
SM3_PRESC1
SM3_PRESC0
SM3_IGAIN
SM3_SET10
SM3_SET9
SM3_SET8
SM3
SM3PWM
SM3PWM
ISM3G
SOFTSTART
Function
CURRENT
REPETITION
REPETITION
OUTPUTBUFF
SM3 PWM DUTY CYCLE
ENABLE
LIMIT
RATE[1]
RATE[0]
ER MODE
SEE SM3 PWM REPETITION
When 0
ENABLED
300 mA
Hi-Z
ADD 0 TO DUTY CYCLE
TABLE
SEE SM3 PWM REPETITION
When 1
DISABLED
500 mA
LO
ADD 50%
ADD 25%
ADD 12.5%
TABLE
Table 3-40. SM3 PWM Repetition Settings
SM3PRESC[1]
SM3PRESC[0]
REPETITION RATE (Hz)
0
0
550
0
1
366
1
0
275
1
1
220
The internal LED switch, in series with the external LED’s, disconnects the LEDs from ground during
shutdown. In addition, the LED switch is driven by a PWM signal generated internally, enabling adjusting
the average LED current by setting the LED switch duty cycle. The duty cycle is adjusted with control bits
SM3_SET, on register SM3_SET0. With this control method the LED brightness depends on the LED
switch duty cycle only and is independent of the boost converter operating frequency. The duty cycle
control used in the SM3 converter LED switch is implemented by a single PWM pulse with a fixed
repetition rate. An example of distinct duty cycles is shown IN Figure 3-19
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DETAILED DESCRIPTION
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