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参数资料
| 型号： | TPS40074RHL |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 550 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | PLASTIC, QFN-20 |
| 文件页数： | 32/37页 |
| 文件大小： | 448K |
| 代理商： | TPS40074RHL |
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ELECTRICAL CHARACTERISTICS
TPS40074
SLUS617–APRIL 2005
TA = –40°C to 85°C, VIN =12Vdc,RT = 90.9 k,IKFF = 300 A, fSW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
INPUT SUPPLY
VDD
Input voltage range, VIN
4.5
28
V
OPERATING CURRENT
IDD
Quiescent current
Output drivers not switching
2.5
3.5
mA
LVBP
VLVBP
Output voltage
TA =TJ = 25°C
3.9
4.2
4.5
V
OSCILLATOR/RAMP GENERATOR
fOSC
Accuracy
450
500
550
kHz
VRT
RT voltage
2.23
2.40
2.58
V
tON(min)
Minimum output pulse time(1)
CHDRV = 0 nF
150
ns
VIH
High-level input voltage, SYNC
2
5
V
VIL
Low-level input voltage, SYNC
0.8
ISYNC
Input current, SYNC
510
A
VFB = 0 V, 100 kHz ≤ fSW ≤ 500 kHz
84%
95%
Maximum duty cycle
VFB = 0 V, fSW = 1 MHz
76%
93%
VKFF
Feed-forward voltage
0.35
0.40
0.45
V
IKFF
Feed-forward current operating range(1)
20
1100
A
SOFT START
ISS
Charge current
712
17
A
tDSCH
Discharge time
CSS = 3.9 nF
25
75
s
CSS =3.9 nF,VSS rising from 0.7 V to 1.6
tSS
Soft-start time
210
290
500
V
Command zero output voltage(2)(1)
300
mV
DBP
VDD >10V
7
8
9
VDBP
Output voltage
V
VVDD = 4.5 V, IOUT =25mA
4.0
4.3
ERROR AMPLIFIER
TA =TJ = 25°C
0.698
0.700
0.704
VFB
Feedback regulation voltage total variation
0°C ≤ TA =TJ ≤ 85°C
0.690
0.700
0.707
V
-40°C ≤ TA =TJ ≤ 85°C
0.690
0.700
0.715
VSS(offset) Soft-start offset from VSS(1)
Offset from VSS to error amplifier
1
GBWP
Gain bandwidth(1)
510
MHz
AVOL
Open loop gain
50
dB
ISRC
Output source current
2.5
4.5
mA
ISINK
Output sink current
2.5
6
IBIAS
Input bias current
VFB = 0.7 V
–250
0
nA
SHORT CIRCUIT CURRENT PROTECTION
IILIM
Current sink into ILIM pin
115
135
150
A
VILIM(ofst) Current limit offset voltage
VILIM = 11.5 V, (VSW -VILIM)VVDD = 12 V
–50
–30
–10
mV
tHSC
Minimum HDRV pulse width
During short circuit
135
225
ns
Propagation delay to output(1)
50
ns
tBLANK
Blanking time(1)
50
ns
tOFF
Off time during a fault (SS cycle times)
7
cycles
(1) Ensured by design. Not production tested.
(2) For zero output voltage only. Does not assure lack of activity on HDRV or LDRV.
4
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