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LM25037 数据表(PDF) 4 Page - Texas Instruments

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部件名 LM25037
功能描述  LM25037/LM25037-Q1 Dual-Mode PWM Controller With Alternating Outputs
Download  31 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM25037 数据表(HTML) 4 Page - Texas Instruments

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LM25037, LM25037-Q1
SNVS572D – JULY 2008 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full operating junction
temperature range of
−40°C to + 125°C. VVIN = 12V, VVCC = 10V, RRT1 = 30.1 kΩ, RRT2 = 30.1 kΩ, VUVLO = 3V unless
otherwise stated.
(1)(2)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VREF(UV)
Hysteresis
0.4
V
Under-Voltage Lock Out and Shutdown (UVLO Pin)
VUVLO
Under-voltage threshold
1.20
1.25
1.295
V
IUVLO
Hysteresis current
UVLO pin sinking
17
22
26
µA
Under-voltage Shutdown Threshold
UVLO voltage rising
0.35
0.45
0.6
V
Hysteresis
0.1
V
Current Sense Input (CS Pin)
VCS
Current Limit Threshold
0.22
0.255
0.29
V
CS delay to output
CS from zero to 1V. Time for OUTA and
27
ns
OUTB to fall to 90% of VCC. Output load =
0 pF.
Leading edge blanking time at CS
65
ns
CS sink impedance (clocked)
Internal FET sink impedance
21
45
Current Limit Restart (RES Pin)
VRES
RES Threshold
1.9
2
2.2
V
Charge source current
VRES = 1.5V
14
18
21
µA
Discharge sink current
VRES = 1V
5
8
11
µA
Soft-Start (SS Pin)
ISS
Charging current in normal
VSS = 0
70
100
130
µA
operation
Charging current during a hiccup
VSS = 0
0.6
1
1.4
µA
mode restart
Soft-Stop Current Sink
VSS = 2.0V
70
100
130
µA
Oscillator (RT1 and RT2 Pins)
DT1
Dead-Time 1
RRT2 = 15 kΩ
40
75
105
ns
DT2
Dead-Time 2
RRT2 = 50 kΩ
250
ns
FSW1
Frequency 1 (at OUTA, half
RRT1 = 30.1 kΩ, RRT2 = 30.1 kΩ,
178
200
222
kHz
oscillator frequency)
FSW2
Frequency 2 (at OUTA, half
RRT1 = 11 kΩ, RRT2 = 30.1 kΩ,
448
515
578
kHz
oscillator frequency)
DC level
2
V
Input Sync threshold
2.5
3
3.4
V
PWM Controller (Comp Pin)
Delay to output
65
ns
VPWM-OS
SS to RAMP offset
0.7
1
1.2
V
Minimum duty cycle
VSS = 0V
0
%
COMP Open Circuit Voltage
VFB = 0V
4.5
4.75
5.0
V
COMP short circuit current
VFB = 0V, COMP = 0V
0.5
1
1.5
mA
Voltage Feed-Forward (RAMP Pin)
RAMP sink impedance(Clocked)
5
20
Error Amplifier
GBW
Gain Bandwidth
4
MHz
DC Gain
75
dB
Input Voltage
VFB = COMP
1.22
1.245
1.27
V
COMP sink capability
VFB = 1.5V COMP=1V
5
13
mA
FB Bias Current
10
nA
Main Output Drivers (OUTA and OUTB Pins)
4
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM25037 LM25037-Q1


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