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| 型號(hào)： | TPS51020DBTR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 450 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封裝： | GREEN, PLASTIC, TSSOP-30 |
| 文件頁數(shù)： | 26/29頁 |
| 文件大小： | 672K |
| 代理商： | TPS51020DBTR |
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TPS51020
SLUS564C JULY 2003 REVISED OCTOBER 2008
6
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
TA = 40°C to 85°C, 4.5 V < VIN < 20 V, CVIN = 0.1 F, CVREG5 = 2.2 F, CREF_X = 0.01 F, PGOOD = 0.2 V, ENBLx = DDR = VIN,
INVx = COMPx, RSSTRTx = OPEN, TRIP1 = TRIP2 = VIN, LLx = GND, VBSTx = LLX+5, C(OUTx_U, OUTx_D)=1 nF, REG5_IN = 0V, GND =
OUTGNDx = 0 V, VO1_VDDQ = VO2 = 0 V (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TIMERS: SOFT-START RAMP GENERATOR
ISSQ
SSTRTx charge current
VSSTRTx = 1 V
1.8
2.3
2.9
A
ISSDQ
SSTRTx discharge current
VSSTRTx = 0.5 V
0.1
mA
VREFTRK
SSTRTx at SMPS regulation point voltage(7)
1.00
1.22
1.45
VSSOK
SSTRTx OK to restart voltage
0.23
0.29
0.35
V
VSSFIN
SSTRTx finished voltage(8)
1.4
1.5
1.6
V
VSSCLP
SSTRTx frequency select voltage(9)
3.35
3.60
3.80
OUTPUTS: INTERNAL BST DIODE
VFBST
Forward voltage
(VVREF5 VVBSTx),VVREF5 = 5 V, IF = 10 mA
TA = 25°C
0.80
0.85
V
IRBST
Reverse current
VRBST= 30 V
0.1
0.5
A
OUTPUTS: N-CHANNEL MOSFET GATE DRIVERS
RUSRC
OUTx_U source impedance
3
10
RDSRC
OUTx_D source impedance
3
10
RUSNK
OUTx_U sink impedance
2.5
5.0
RDSNK
OUTx_D sink impedance
2.5
5.0
TDEAD
Gate non-overlap dead time
100
ns
(1) Ensured by design. Not production tested.
(2) Maximum 450-kHz frequency can be achieved only when both channels are enabled.
(3) 270 kHz is the default frequency during start-up for both channels.
(4) See Table 1.
(5) See PWM detailed description
(6) Feedforward Gain can be approximated as follows:
VRAMP= K1×VIN+B1, VOFFSET=K2×VIN×+B2 where K1=0.017, K2=0.01, B1=0.35 V, B2=0.4 V.
At the running duty cycle, the VCOMP should be approximately: VCOMP + VOUT
K1
) B1
VIN
) (K2
VIN
) B2)
(7) See waveform point A in Figure 1
(8) See waveform point B in Figure 1
(9) See waveform point C in Figure 1
Table 1. Frequency Selection
SSTRT1
SSTRT2
FREQUENCY (kHz)
CSSTRT only
450(10)
1 M
|| CSSTRT to GND
CSSTRT only
360
CSSTRT only
1 M
|| CSSTRT to GND
360
1 M
|| CSSTRT to GND
1 M
|| CSSTRT to GND
270
(10)Although selection is made by placing a 1M resistor in parallel with the SSTRTx timing
capacitor, the softstart time to 0.85V is altered by about only 20%.
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