參數(shù)資料
型號(hào): TPS56100PWPRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 1.4 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28
封裝: GREEN, PLASTIC, HTSSOP-28
文件頁數(shù): 14/30頁
文件大?。?/td> 595K
代理商: TPS56100PWPRG4
TPS56100
HIGHEFFICIENCY DSP POWER SUPPLY CONTROLLER
FOR 5V INPUT SYSTEMS
SLVS201A JUNE 1999 REVISED JULY 1999
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
slowstart timing (continued)
Set the slowstart timing using the formula:
C5
+
tss
5
R
VREFB
tss
(5
R5)
Where
C5 = Slowstart capacitance in
F
tSS = Slowstart timing in s
RVREFB = Resistance from VREFB to GND in ohms (≈ R5)
hysteresis voltage
A hysteretic controller regulates by self-oscillation, thus requiring a small ripple voltage on the output which the
input comparator uses for sensing. Once selected, the TPS56100 hysteresis is proportional to the reference
voltage; programming Vref to a new value automatically adjusts the hysteresis to be the same percentage of
Vref. The actual output ripple voltage is the combination of the hysteresis voltage, overshoot caused by internal
delays, and the output capacitor characteristics. Figure 19 shows the hysteresis window voltage (VHI to VLO)
and the output voltage ripple (VMAX to VMIN). Since the output current from VREFB should be less than
500
A, the total divider resistance (R4 + R5) should be greater than 7 k. The hysteresis voltage should be
no greater than 60 mV so R5 will dominate the divider.
R4
R5
VHSYT
VREFB
Hysteresis Window = 2
× VR4
Figure 17. Hysteresis Divider Circuit
VO
VMAX
VMIN
VREF
VHI
VLO
t
Figure 18. Output Ripple
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