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Giải thích chi tiết về linh kiện  6A, Adjustable Frequency Synchronous Buck Regulator
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LM20146
SNVS563B – NOVEMBER 2008 – REVISED FEBRUARY 2009
www.ti.com
Electrical Characteristics (continued)
Unless otherwise stated, the following conditions apply: AVIN = PVIN = VIN = 5V. Limits in standard type are for TJ = 25°C
only, limits in bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits
are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at
TJ = 25°C, and are provided for reference purposes only.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Gm
Error Amplifier Transconductance
ICOMP = ± 50 µA
450
510
600
µmho
AVOL
Error Amplifier Voltage Gain
2000
V/V
Power Good
VOVP
Over Voltage Protection Rising Threshold
With respect to VFB
105
108
111
%
VOVP_HYS
Over Voltage Protection Hysteresis
2
3
%
VPGTH
PGOOD Rising Threshold
With respect to VFB
92
94
96
%
VPGHYS
PGOOD Falling Hysteresis
2
3
%
TPGOOD
PGOOD deglitch time
16
µs
IOL
PGOOD Low Sink Current
VPGOOD = 0.4V
0.6
1
mA
IOH
PGOOD High Leakage Current
VPGOOD = 5V
5
100
nA
Enable
VIH_EN
EN Pin turn-on Threshold
VEN Rising
1.08
1.18
1.28
V
VEN_HYS
EN Pin Hysteresis
66
mV
Thermal Shutdown
TSD
Thermal Shutdown
160
°C
TSD_HYS
Thermal Shutdown Hysteresis
10
°C
Thermal Resistance
θJA
Junction to Ambient
See(1)
25
°C/W
(1)
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ_MAX, the junctions-to-ambient thermal
resistance,
θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using: PD_MAX = (TJ_MAX – TA)/θJA. The maximum power dissipations of 2.6W is determined using TA = 25°C, θJA = 25°C/W, and TJ_MAX
= 125°C. The
θJA specification of 25°C/W listed in the electrical characteristics table is measured with the part surface mounted to a 2" x
2" FR4 4 layer board. See Figure 36 for more detailed
θJA information.
4
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