SG1846J/DESC [MICROSEMI]
CURRENT MODE PWM CONTROLLER; 电流模式PWM控制器
| 型号： | SG1846J/DESC |
| 厂家： | 
Microsemi |
| 描述： | CURRENT MODE PWM CONTROLLER |
| 文件： | 总10页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SG1846/SG2846/SG3846
CURRENT MODE PWM CONTROLLER
DESCRIPTION
FEATURES
The SG1846 family of control ICs provides all of the necessary
features to implement fixed frequency, current mode control
schemes while maintaining a minimum external parts count. The
superior performance of this technique can be measured in im-
proved line regulation, enhanced load response characteristics,
and a simpler, easier-to-design control loop. Topological advan-
tages include inherent pulse-by-pulse current limiting capability,
automatic symmetry correction for push-pull converters, and the
ability to parallel “power modules” while maintaining equal current
sharing.
• Automatic feed forward compensation
• Programmable pulse by pulse current limiting
• Automatic symmetry correction in push-pull
configuration
• Enhanced load response characteristics
• Parallel operation capability for modular power
systems
• Differential current sense amplifier with wide
common mode range
• Double pulse suppression
• 200mA totem-pole outputs
• ± 1% bandgap reference
• Under-voltage lockout
• Soft-start capability
• Shutdown capability
• 500KHz operation
Protection circuitry includes built-in under-voltage lockout and
programmable current limit in addition to soft start capability. A
shutdown function is also available which can initiate either a
complete shutdown with automatic restart or latch the supply off.
Other features include fully latched operation, double pulse sup-
pression, deadtime adjust capability, and a ±1% trimmed bandgap
reference.
HIGH RELIABILITY FEATURES - SG1846
♦ Available to MIL-STD - 883
♦ Radiation data available
♦ LMI level "S" processing available
BLOCK DIAGRAM
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
1
∞
SG1846
ABSOLUTE MAXIMUM RATINGS (Note 1 and 2)
Sync Output Current ...........................................................5mA
Error Amplifier Output Current ............................................5mA
Oscillator Charging current (Pin 9) .....................................5mA
Operating Junction Temperature
Hermetic (J, L, F Packages) ........................................ 150°C
Plastic (N, DW Package) ............................................. 150°C
Storage Temperature Range ............................ -65°C to 150°C
Lead Temperature (Soldering, 10 Seconds) .................. 300°C
Supply Voltage (+V ) .......................................................... 40V
IN
Collector Supply Voltage(VC) .............................................. 40V
Analog Inputs (Pins 3, 4, 5, 6, & 16) ...................... -0.3V to +VIN
Logic Input ........................................................... -0.3V to 5.5V
Soure/Sink Load current (continuous) .......................... 200mA
Source/Sink Load Current (peak, 200ns) ...................... 500mA
Reference Load Current .................................................. 30mA
Soft Start Sink Current ..................................................... 50mA
Note 1. Values beyond which damage may occur.
Note 2. Pin numbers refer to ceramic J package.
THERMAL DATA
J Package:
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal resistance of the package in a standard mount-
ing configuration. The θJA numbers are meant to be
guidelines for the thermal performance of the device/pc-
board system. All of the above assume no ambient
airflow.
Thermal Resistance-Junction to Case, θJC .................. 30°C/W
Thermal Resistance-Junction to Ambient, θJA .............. 80°C/W
N Package:
Thermal Resistance-Junction to Case, θJC .................. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 65°C/W
DW Package:
Thermal Resistance-Junction to Case, θJC ................... 40°C/W
Thermal Resistance-Junction to Ambient, θJA ............. 95°C/W
F Package:
Thermal Resistance-Junction to Case, θJC .................. 70°C/W
Thermal Resistance-Junction to Ambient, θJA ........... 115°C/W
L Package:
Thermal Resistance-Junction to Case, θJC .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ........... 120°C/W
RECOMMENDED OPERATING CONDITIONS (Note 3)
Supply Voltage Range ............................................... 8V to 40V
Collector Supply Voltage Range ............................. 4.5V to 40V
Source/Sink Output Current (continuous) ...................... 100mA
Source/Sink Output Current (peak 200ns) .................... 200mA
Reference Load Current ........................................... 0 to 10mA
Oscillator Frequency Range ........................... 1KHz to 500KHz
Oscillator Timing Resistor (RT) ........................... 2KΩ to 100KΩ
Oscillator Timing Capacitor (CT) .................... 1000 pF to 0.1µF
Operating Ambient Temperature Range
SG1846 ...........................................................-55°C to 125°C
SG2846 .............................................................-25°C to 85°C
SG3846 ................................................................ 0°C to 70°C
Note 3. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1846/SG1847 with -55°C≤ TA ≤ 125°C, SG2846
with -25°C ≤ TA ≤ 85°C, SG3846 with 0°C ≤ T ≤ 70°C, +VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and
case temperatures equal to the ambient tempAerature.)
SG1846
SG3846
Units
Parameter
Reference Section
Test Conditions
SG2846
Min. Typ. Max. Min. Typ. Max.
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 4)
Total Output Variation (Note 4)
Output Noise Voltage (Note 4)
Long Term Stability (Note 4)
Short Circuit Output Current
TJ = 25°C, IO = 1mA
VIN = 8V to 40V
IL = 1mA to 10mA
5.05 5.10 5.15 5.00 5.10 5.20
V
mV
mV
mV/°C
V
µV
mV
mA
5
3
20
15
5
3
20
15
0.4
0.4
Line, Load and Temperature
10Hz ≤ f ≤ 10KHz. TJ = 25°C
TJ = 125°C, 1000Hrs.
VREF = 0V
5.00
5.20 4.95
5.25
100
5
100
5
-10 -45
-10 -45
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
2
∞
SG1846
ELECTRICAL CHARACTERISTICS (continued)
SG1846
SG2846
SG3846
Parameter
Test Conditions
Units
Min. Typ. Max. Min. Typ. Max.
Oscillator Section (Note 9)
Initial Accuracy
Voltage Stability
TJ = 25°C
VIN = 8V to 40V
39
43
1
47
2
39
43
1
47
2
KHz
%
Temperature Stability (Note 4)
Sync Output High Level
Sync Output Low Level
Sync Input High Level
Sync Input Low Level
Sync Input Current
Over Operating Range
1
1
%
V
V
V
V
mA
3.9 4.35
2.3
3.9 4.35
2.5
2.5
2.3 2.5
Pin 8 = 0V
Pin 8 = 0V
Sync Voltage = 5.25V, Pin 8 = 0V
3.9
3.9
2.5
1.2 1.5
1.2 1.5
Error Amp Section
Input Offset Voltage
Input Bias Current
Input Offset Current
Common Mode Range
Open Loop Voltage Gain
Unity Gain Bandwidth (Note 4)
CMRR
0.5
-0.6 -1
40
5
0.5
-0.6 -2
40
10
mV
µA
nA
V
dB
MHz
dB
dB
mA
mA
V
250
VIN-2V
250
VIN-2V
VIN = 8V to 40V
VO = 1.2V to 3V, VCM = 2V
TJ = 25°C
0
80
0
80
105
0.7 1.0
105
0.7 1.0
75 100
75
80
2
V
CM = 0V to 38V, VIN = 40V
100
105
6
PSRR
VIN = 8V to 40V
80
2
-0.4
105
6
-0.5
Output Sink Current
Output Source Current
High Level Output Voltage
Low Level Output Voltage
VID = - 15mV to -5V, VPIN 7 = 1.2V
VID = 15mV to 5V, VPIN 7 = 2.5V
RL = 15KΩ (Pin 7)
-0.4
-0.5
4.3 4.6
4.3 4.6
RL = 15KΩ (Pin 7)
0.7
1
0.7
1
V
Current Sense Amplifier Section
Amplifier Gain (Notes 5 & 6)
Maximum Differential (Note 6)
Input Signal (VPIN 4 - VPIN 3)(Note 5)
Input Offset Voltage (Note 5)
CMRR
VPIN 3 = 0V, Pin 1 Open
Pin 1 Open RL = 15KΩ (Pin 7)
2.5 2.75 3.0 2.5 2.75 3.0
V
1.1 1.2
5
1.1 1.2
5
V
mV
dB
dB
µA
µA
V
VPIN 1 = 0.5V, Pin 7 Open
25
25
V
CM = 1V to 12V
VIN = 8V to 40V
PIN 1 = 0.5V, Pin 7 Open
60
60
83
84
60
60
83
84
PSRR
Input Bias Current (Note 5)
Input Offset Current (Note 5)
Input Common Mode Range
Delay to Outputs (Note 4)
V
-2.5 -10
-2.5 -10
VPIN 1 = 0.5V, Pin 7 Open
0.08
1
0.08
1
0
VIN -3
0
VIN -3
TJ = 25°C
200 500
200 500
ns
Current Limit Adjust Section
Current Limit Offset Voltage(Note 5) VPIN 3 = 0, VPIN 4 = 0V, Pin 7 Open
0.45 0.5 0.55 0.45 0.5 0.55
-10 -30 -10 -30
V
µA
Input Bias Current
VPIN 5 = VREF, VPIN 6 = 0V
Shutdown Terminal Section
Threshold Voltage
Input Voltage Range
Minimum Latching Current
(IPIN 1) (Note 7)
250 350 400 250 350 400
mV
V
0
VIN
0
VIN
3.0 1.5
3.0 1.5
mA
Maximum Non-Latching Current
(IPIN 1) (Note 8)
Delay to Outputs (Note 4)
1.5 0.8
300 600
1.5 0.8
300 600
mA
ns
TJ = 25°C
VC = 40V
Output Section
Collector Emitter Voltage
Collector Leakage Current
Output Low Level
40
40
V
µA
V
200
0.1 0.4
0.4 2.1
200
I
SINK = 20mA
0.1
0.4
ISINK = 100mA
0.4 2.1
V
Output High Level
ISOURCE = 20mA
13 13.5
12 13.5
13 13.5
12 13.5
V
V
ISOURCE = 100mA
Rise Time (Note 4)
Fall Time (Note 4)
CL = 1nF, TJ = 25°C
CL = 1nF, TJ = 25°C
50 300
50 300
50 300
50
ns
ns
300
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
3
∞
SG1846
ELECTRICAL CHARACTERISTICS (continued)
SG1846
SG2846
SG3846
Test Conditions
Units
Parameter
Min. Typ. Max. Min. Typ. Max.
Under-Voltage Lockout Section
Start-Up Threshold
Threshold Hysteresis
Total Standby Current
Supply Current
7.7
0.75
7.7 8.0
0.75
8.0
V
V
17
21
17
21
mA
Note 4.These parameters although guaranteed over the recommended
operating conditions, are not tested in production.
Note 7.Current into Pin 1 guaranteed to latch circuit in shutdown state.
Note 8.Current into Pin 1 guaranteed not to latch circuit in shutdown
state.
Note 5.Parameter measured at trip point of latch with VPIN 5 = VREF
,
VPIN 6 = 0V.
Note 6.Amplifier gain defined as : G =
Note 9.RT = 10KΩ, CT = 4.7nF
∆ VPIN 7
; VPIN 4 = 0V to 1.0V
∆ VPIN 4
CHARACTERISTIC CURVES
FIGURE 1.
FIGURE 2.
FIGURE 3.
REFERENCE VOLTAGE VS. TEMPERATURE
VREF SHORT CIRCUIT CURRENT VS. TEMPERATURE
CURRENT SENSE THRESHOLD
VS. ERROR AMPLIFIER OUTPUT
FIGURE 4.
FIGURE 5.
FIGURE 6.
CURRENT SENSE GAIN VS. TEMPERATURE
OSCILLATOR VALLEY VOLTAGE VS. TEMPERATURE
OSCILLATOR PEAK VOLTAGE VS. TEMPERATURE
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
4
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1846
CHARACTERISTIC CURVES (continued)
FIGURE 7.
FIGURE 8.
FIGURE 9.
MINIMUM SCR LATCH CURRENT
CURRENT SENSE DELAY VS. TEMPERATURE
SHUTDOWN DELAY TO OUTPUT VS. TEMPERATURE
FIGURE 10.
FIGURE 11.
FIGURE 12.
ERROR AMPLIFIER INPUT OFFSET VOLTAGE
VS. TEMPERATURE
ERROR AMP SINK CURRENT VS. TEMPERATURE
OUTPUT TRANSISTOR SATURATION VOLTAGE
VS. OUTPUT CURRENT (SINK TRANSISTOR)
FIGURE 13.
FIGURE 14.
FIGURE 15.
OUTPUT TRANSISTOR SATURATION VOLTAGE
VS. OUTPUT CURRENT (SOURCE TRANSISTOR)
SYNC PULSEWIDTH VS. TEMPERATURE
SYNC PULSEWIDTH VS. TEMPERATURE
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
5
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1846
CHARACTERISTIC CURVES (continued)
FIGURE 16.
FIGURE 17.
FIGURE 18.
OSCILLATOR FREQUENCY VS. TEMPERATURE
OSCILLATOR FREQUENCY VS. TEMPERATURE
DUTY CYCLE VS. TEMPERATURE
APPLICATION INFORMATION
FIGURE 19- OSCILLATOR FREQUENCY CURVES
2.2
RTCT
Oscillator frequency is approximated by the formula: fT ≈
FIGURE 20 - OSCILLATOR CIRCUIT
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
6
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1846
APPLICATION INFORMATION (continued)
FIGURE 22 - CURRENT SENSE AMPCONNECTIONS
FIGURE 21 - ERROR AMP OUTPUT CONFIGURATION
(Error amplifier can source up to 0.5mA)
A small RC filter may be required in some applications to reduce switch
transients. Differential input allows remote, noise free switching.
FIGURE 23 - SINGLE ENDED BOOST CONFIGURATION
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
7
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1846
APPLICATIONS INFORMATION (continued)
FIGURE 24 - BUCK CONVERTER WITH CURRENT SENSE WINDING
FIGURE 25 - PUSH/PULL CONVERTER WITH SLOPE COMPENSATION
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
8
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1846
APPLICATIONS INFORMATION (continued)
FIGURE 26 - PULSE BY PULSE CURRENT LIMITING
FIGURE 27 - SOFT START AND SHUTDOWN/RESTART FUNCTIONS
VREF
R1
VREF
R1
< 0.8mA
>3mA (LATCHED OFF)
FIGURE 28 - SHUTDOWN WITH AUTO-RESTART
FIGURE 29 - SHUTDOWN WITHOUT AUTO-RESTART (LATCHED)
VREF
R1
VREF
If
< 0.8mA the shutdown latch will commutate
If
> 3mA the device will latch off
R1
until power is recycled.
when ISS < 0.8mA and a restart cycle will be initiated.
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
9
∞
SG1846
CONNECTION DIAGRAMS & ORDERING INFORMATION (See Notes Below)
Ambient
Temperature Range
Package
Part No.
Connection Diagram
16-PIN CERAMIC DIP
J - PACKAGE
SG1846J/883B
SG1846J/DESC
SG1846J
SG2846J
SG3846J
-55°C to 125°C
-55°C to 125°C
-55°C to 125°C
-25°C to 85°C
0°C to 70°C
16
C.L./SOFTSTART
VREF
1
2
3
SHUTDOWN
15
14
13
+VIN
(-) C.S.
OUTPUT B
VC
(+) C.S.
4
5
6
7
12
11
10
9
(+) ERROR AMP
(-) ERROR AMP
COMPENSATION
CT
GROUND
OUTPUT A
SYNC
16-PIN PLASTIC DIP
N - PACKAGE
SG2846N
SG3846N
-25°C to 85°C
0°C to 70°C
8
RT
16-PIN WIDEBODY
PLASTIC S.O.I.C
DW - PACKAGE
SG2846DW
SG3846DW
-25°C to 85°C
0°C to 70°C
16
15
14
13
12
SHUTDOWN
C.L./SOFTSTART
VREF
1
2
3
4
5
6
7
8
+VIN
(-) C.S.
OUTPUT B
(+) C.S.
VC
GROUND
OUTPUT A
(+) ERROR AMP
(-) ERROR AMP
COMPENSATION
11
10
SYNC
RT
9
CT
16-PIN CERAMIC
FLAT PACK
F - PACKAGE (Note 3)
SG1846F/DESC
-55°C to 125°C
1
2
3
4
5
6
7
8
16
C.L./SOFTSTART
VREF
SHUTDOWN
15
14
13
12
+VIN
(-) C.S.
OUTPUT B
VC
(+) C.S.
(+) ERROR AMP
(-) ERROR AMP
COMPENSATION
CT
GROUND
OUTPUT A
SYNC
11
10
9
RT
20-PIN CERAMIC
LEADLESS CHIP CARRIER
L - PACKAGE (Note 3)
SG1846L/883B
SG1846L/DESC
SG1846L
-55°C to 125°C
-55°C to 125°C
-55°C to 125°C
3
2
1
20 19
1. N.C.
2. C.L./SOFTSTART
3. VREF
11.N.C.
12.RT
4
5
18
13.SYNC
4. (-) C.S.
14.OUTPUT A
15.GROUND
16.N.C.
17.VC
18.OUTPUT B
19.VIN
17
16
15
14
5. (+) C.S.
6. N.C.
7. (+) ERROR AMP
8. (-) ERROR AMP
9. COMPENSATION
10. CT
6
7
8
20.SHUTDOWN
9
10 11 12 13
Notes:
1. Contact factory for JAN and DESC part availability.
2. All parts are viewed from the top.
3. Consult factory for product availability.
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright 1994
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 FAX: (714) 893-2570
10
∞
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