參數(shù)資料
型號： TPS65800RTQTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56
封裝： 8 X 8 MM, GREEN, PLASTIC, QFN-56
文件頁數(shù)： 57/98頁
文件大?。?/td> 2077K
代理商： TPS65800RTQTG4
www.ti.com
GATE
CONTROL
LOGIC
SM1 OUTPUT
VOLTAGESETTING
SM1/SM2 PHASE
CONTROL
I2C
REGISTERS
SM1 OPERATING
MODE :
ON/OFF,
PWM, PFM, STANDBY
SM1 DISCHARGE
SWITCHENABLE ,
LOWPFMRIPPLE
L1
PGND 1
VIN_SM1
SM1
SM2 OUTPUT
VOLTAGESETTING
L2
PGND2
VIN_SM2
SM2
SM 1 CONVERTER
3.3 H
10 F
VO(SM1)
10 F
3.3 H
10 F
VO(SM2)
10 F
OUT
P1
P2
+
_
+
_
29
V ( V I N _ S M 1)
39
V(VIN_SM1)
SET
RESET
OUT
EN_PFM
POWERSTAGE
CURRENT COMPARATORS
I(L1)
SM1
CONTROL
LOGIC
EN_PFM
EN_PWM
EN_ALL
DCHGON
SM2 OPERATING
MODE :
ON/OFF ,
SM1 DISCHARGE
SWITCHENABLE ,
LOWPFMRIPPLE
TPS65800
LSM 1
LSM2
C21
C22
C19
C20
PWMCONTROL
PFMCONTROL
PFMON
PWMON
DAC
EN_PWM
SM2CONVERTER
SAMETOPOLOGY ASSM1CONVERTER
PWM, PFM, STANDBY
I
PFM(LEAVE) +
V(VIN_SM3)
29 W
,
I
PFM(ENTER) +
V(VIN_SM3)
39 W
(6)
Output Voltage Slew Rate
SLVS606C – SEPTEMBER 2005 – REVISED FEBRUARY 2007
Figure 41. SM1/SM2 Converter
The TPS65800 SM1 and SM2 buck converters can be set to operate only in PWM mode or to switch
automatically between PFM and PWM modes. The average load current is monitored, and the PFM mode is set
if the average load current is below the threshold IPFM(ENTER). When in PFM mode the load current is also
monitored, and the PWM mode is set when the load current exceeds the threshold IPFM(LEAVE). The thresholds
for automatic PFM/PWM switching are calculated as shown in Equation 6 for the SM1 converter, the same
thresholds apply to the SM2 converter by replacing VIN_SM1 by VIN_SM2:
The automatic switching mode is enabled via the control bits PFM_SM1 and PFM_SM2 on I2C registers
SM1_SET1 and SM2_SET1.
I2C registers enable setting the output voltage slew rate, when transitioning from one programmed voltage to a
new programmed voltage value. These events can be triggered by a new output voltage selection or by
switching from a low power mode (standby) to a normal operating mode. During a transition, the output voltage
is stepped from the currently programmed voltage to the new target voltage. The slew rate from the initial
voltage to the final voltage can be selected using I2C registers, SM1_SET2 and SM2_SET2, ranging from 0.24
mv/
s to 15.36 mV/s for the SM1 converter and 0.48 to 30.72 mV/S for the SM2 converter. If the slew rate is
set to OFF, the output voltage goes from the current value to the programmed value in a single step.
During the transition to standby mode the Power Good comparators are disabled.
60
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