LM1577THADJ/883 [TI]
6A SWITCHING REGULATOR, 62kHz SWITCHING FREQ-MAX, MSFM5;
| 型号： | LM1577THADJ/883 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 6A SWITCHING REGULATOR, 62kHz SWITCHING FREQ-MAX, MSFM5 局域网 开关 |
| 文件： | 总6页 (文件大小：23K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MILITARY DATA SHEET
Original Creation Date: 08/25/95
Last Update Date: 09/18/95
MNLM1577-X-ADJ REV 0A0
Last Major Revision Date: 08/25/95
SIMPLE SWITCHER STEP-UP VOLTAGE REGULATOR
General Description
The LM1577-ADJ is a monolithic integrated circuit that provides all of the power and
control functions for set-up (boost), flyback, and forward converter switching regulators.
Requiring a minimum number of external components, this regulator is cost effective, and
simple to use.
Included on the chip is a 3.0A NPN switch and its associated protection circuitry,
consisting of current and thermal limiting, and undervoltage lockout. Other features
include a 52kHz fixed-frequency oscillator that requires no external components, a soft
start mode to reduce in-rush current during start-up and current mode control for improved
rejection of input voltage and output load transients.
Industry Part Number
NS Part Numbers
LM1577
LM1577K-ADJ/883 (*)
LM1577THADJ/883 (**)
Prime Die
LM1577D
Controlling Document
5962-9216601MXA*, QYA** REV -
Processing
Subgrp Description
Temp (oC)
MIL-STD-883, Method 5004
1
Static tests at
+25
2
Static tests at
+125
-55
3
Static tests at
4
Dynamic tests at
Dynamic tests at
Dynamic tests at
Functional tests at
Functional tests at
Functional tests at
Switching tests at
Switching tests at
Switching tests at
+25
Quality Conformance Inspection
5
+125
-55
6
MIL-STD-883, Method 5005
7
+25
8A
8B
9
+125
-55
+25
10
11
+125
-55
1
MILITARY DATA SHEET
MNLM1577-X-ADJ REV 0A0
Features
- Requires few external components
- NPN output switches 3.0A, can stand off 65V
- Wide input voltage range: 3.5V to 40V
- Current-mode operation for improved transient response, line regulation, and current
limit
- 52kHz internal oscillator
- Soft-start function reduces in-rush current during start-up
- Output switch protected by current limit, under-voltage lockout, and thermal shutdown
Applications
- Simple boost regulator
- Flyback and forward regulators
- Multiple-output regulator
2
MILITARY DATA SHEET
MNLM1577-X-ADJ REV 0A0
(Absolute Maximum Ratings)
(Note 1)
Supply Voltage
45V
65V
Output Switch Voltage
Output Switch Current
(Note 2)
6.0A
Power Dissipation
Internally Limited
-65 C to +150 C
260 C
Storage Temperature Range
Lead Temperature
(Soldering, 10 seconds)
Maximum Junction Temperature
150 C
Thermal Resistance
ThetaJA
TO3
TO3
(Still Air)
38 C/W
15.5 C/W
57 C/W
16 C/W
(500LF/Min Air flow)
MD078 (Still Air)
MD078 (500LF/Min Air flow)
ThetaJC
TO3
2.0 C/W
1.6 C/W
MD078
Minimum ESD Rating
(Note 3)
2kV
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Operating ratings indicate conditions for which the device is intended to be
functional, but device parameter specifications may not be guaranteed under these
conditions. For guaranteed specifications and test conditions, see the Electrical
Characteristics.
Note 2: Due to timing considerations of the LM1577 current limit circuit, output current
cannot be internally limited when the LM1577 is used as a set-up regulator. To
prevent damage to the switch, its current must be externally limited to 6.0A.
However, output current is internally limited when the LM1577 is used as a flyback or
forward converter regulator in accordance to the Application Hints.
Note 3: Human body model, 1.5K Ohm in series with 100pF.
Recommended Operating Conditions
Supply Voltage
3.5V < Vin < 40V
Output Switch Voltage
0V<Vswitch<60V
Output Switch Current
Iswitch < 3.0A
Temperature Range
-55 C<TA<+125 C
3
MILITARY DATA SHEET
MNLM1577-X-ADJ REV 0A0
Electrical Characteristics
DC: SYSTEM PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 5V, Vfeedback = Vref, Iswitch = 0.
PIN-
NAME
SUB-
SYMBOL
Vout
PARAMETER
CONDITIONS
NOTES
MIN
MAX UNIT
GROUPS
Output Voltage
Vin = 5V to 10V,
Iload = 100mA to 800mA
11.60 12.40 V
11.40 12.60 V
1
2, 3
1
Delta
Vout/Delta
Vin
Line Regulation
Load Regulation
Vin = 3.5V to 10V, Iload = 300mA
50
mV
100
50
mV
mV
mV
2, 3
1
Delta
Vout/Delta
Load
Vin = 5V, Iload = 100mA to 800mA
100
2, 3
4
MILITARY DATA SHEET
MNLM1577-X-ADJ REV 0A0
Electrical Characteristics
DC: DEVICE PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 5V, Vfeedback = Vref, Iswitch = 0.
PIN-
NAME
SUB-
GROUPS
SYMBOL
PARAMETER
CONDITIONS
NOTES
MIN
MAX UNIT
Is
Input Supply
Current
Vfeedback = 1.5V (Switch Off)
10.0
mA
mA
mA
mA
V
1
14.0
50
2, 3
1
Iswitch = 2.0A, Vcomp = 2.0V
(Max Duty Cycle)
85
2, 3
1
Vuv
Vref
Ib
Input Supply
Undervoltage
Lockout
Iswitch = 100mA
2.70
2.65
3.10
3.15
V
2, 3
1
Output Reference Measured at Feedback Pin,
Voltage
1.214 1.246 V
1.206 1.254 V
Vin = 3.5V to 40V, Vcomp = 1.0V
2, 3
1
Error Amp Input
Bias Current
Vcomp = 1.0V
300
nA
nA
800
2, 3
GM
Error Amp
Icomp = -30uA to +30uA, Vcomp = 1.0V
2400
1600
500
4800
5800
umho 1
Transconductance
umho 2, 3
V/V 1
Avol
Error Amp Voltage Vcomp = 1.1V to 1.6V,
Gain
1
1
Rcomp = 1.0 M Ohm
250
V/V 2, 3
Error Amplifier
Output Swing
Upper Limit Vfeedback = 1.0V
2.2
5.0
5.0
0.40
0.55
-130
-90
300
400
7.5
9.5
V
1
2.0
V
2, 3
1
Lower Limit Vfeedback = 1.5V
V
V
2, 3
1
Error Amplifier
Output Current
Vfeedback = 1.0V to 1.5V, Vcomp = 1.0V
Vfeedback = 1.0V to 1.5V, Vcomp=1.0V
Vfeedback = 1.0V, Vcomp = 0V
-300
-400
130
90
uA
uA
uA
uA
uA
uA
%
2, 3
1
2, 3
1
Iss
D
Soft Start
Current
2.5
1.5
93
2, 3
1
Maximum Duty
Cycle
Vcomp = 1.5V, Iswitch = 100mA
90
%
2, 3
1
Il
Switch Leakage
Current
Vswitch = 65V, Vfeedback = 1.5V
(Switch Off)
-1.0
-1.0
300
600
0.7
0.9
uA
uA
V
2, 3
1
Vsat
Switch Saturation Iswitch = 2.0A, Vcomp = 2.0V
Voltage (Max Duty Cycle)
V
2, 3
5
MILITARY DATA SHEET
MNLM1577-X-ADJ REV 0A0
Electrical Characteristics
DC: DEVICE PARAMETERS(Continued)
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Vin = 5V, Vfeedback = Vref, Iswitch = 0.
PIN-
NAME
SUB-
GROUPS
SYMBOL
PARAMETER
CONDITIONS
NOTES
MIN
MAX UNIT
NPN Switch
Current Limit
Vcomp = 2.0V
3.7
3.0
5.3
6.0
A
A
1
2, 3
AC: PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC: Vin = 5V, Vfeedback - Vref, Iswitch = 0.
fo
Oscillator
Frequency
Measured at Switch Pin,
Iswitch = 100mA
48
42
56
62
KHz 4
KHz 5, 6
Note 1: A 1.0 MOhm resistor is connected to the compensation pin (which is the error
amplifier's output) to ensure accuracy in measuring Avol. In actual applications,
this pins load resistance should be > 10 MOhm, resulting in Avol that is typically
twice the guaranteed minimum limit.
6
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