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LM73606RNPR bảng dữ liệu(PDF) 8 Page - Texas Instruments

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tên linh kiện LM73606RNPR
Giải thích chi tiết về linh kiện  LM73605/LM73606 3.5-V to 36-V, 5-A or 6-A Synchronous Step-Down Voltage Converter
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Trang chủ  http://www.ti.com
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LM73605, LM73606
SNVSAH5 – SEPTEMBER 2017
www.ti.com
Product Folder Links: LM73605 LM73606
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Timing Characteristics (continued)
MIN
NOM
MAX
UNIT
SOFT START (SS/TRK PIN)
tSS
Internal soft-start time
CSS = OPEN, from EN rising
edge to PGOOD rising edge
3.5
6.3
ms
POWER GOOD (PGOOD PIN) and OVERVOLTAGE PROTECTION
tPGOOD_RISE
PGOOD rising edge deglitch
delay
80
140
200
µs
tPGOOD_FALL
PGOOD falling edge deglitch
delay
80
140
200
µs
6.7 Switching Characteristics
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
PWM LIMITS (SW PINS)
tON-MIN
Minimum switch on-time
60
82
ns
tOFF-MIN
Minimum switch off-time
70
120
ns
tON-MAX
Maximum switch on-time
HS timeout in dropout
3
6
9
µs
OSCILLATOR (RT and SYNC PINS)
fOSC
Internal oscillator frequency
RT = Open
440
500
560
kHz
fADJ
Minimum adjustable frequency by
RT or SYNC
RT =115 kΩ, 0.1%
315
350
385
kHz
Maximum adjustable frequency by
RT or SYNC
RT = 17.4 kΩ, 0.1%
1980
2200
2420
kHz
VSYNC_HIGH
Sync input high level threshold
2
V
VSYNC_LOW
Sync input low level threshold
0.4
V
VMODE_HIGH
Mode input high level threshold for
FPWM
0.42
V
VMODE_LOW
Mode input low level threshold for
AUTO mode
0.4
V
tSYNC_MIN
Sync input minimum ON and OFF-
time
80
ns
6.8 System Characteristics
The following specifications apply to the circuit found in typical schematic with appropriate modifications from typical bill of
materials. These parameters are not tested in production and represent typical performance only. Unless otherwise stated the
following conditions apply: TA = 25°C, VIN = 12 V, VOUT = 3.3 V, fSW = 500 kHz.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VFB_PFM
Output voltage offset at no load
in auto mode
VIN = 3.8 V to 36 V, VSYNC = 0 V, auto mode
IOUT = 0 A
2%
VDROP
Minimum input to output
voltage differential to maintain
specified accuracy
VOUT = 5 V, IOUT = 3 A, fSW = 2.2 MHz
0.4
V
IQ_SW
Operating quiescent current
(switching)
VEN = 3.3 V, IOUT = 0 A, RT = open, VBIAS =
VOUT = 3.3 V , RFBT = 1 Meg
15
µA
IPEAK_MIN
Minimum inductor peak current
LM73605:
VSYNC = 0, IOUT = 10 mA
1
A
LM73606:
VSYNC = 0 V, IOUT = 10 mA
1.3
IBIAS_SW
Operating quiescent current
from external VBIAS (switching)
fSW = 500 kHz, IOUT = 1 A
7
mA
fSW = 2.2 MHz, IOUT = 1 A
25
DMAX
Maximum switch duty cycle
While in frequency foldback
97.5%
tDEAD
Dead time between high-side
and low-side MOSFETs
4
ns


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