5962-8869701VA [TI]

四路电源和线路监视器 | J | 18 | -55 to 125;
5962-8869701VA
型号: 5962-8869701VA
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
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四路电源和线路监视器 | J | 18 | -55 to 125

控制器 监视器 微控制器 微控制器和处理器 外围集成电路 uCs集成电路 uPs集成电路
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UC1903  
UC2903  
UC3903  
Quad Supply and Line Monitor  
FEATURES  
DESCRIPTION  
Inputs for Monitoring up to Four  
Separate Supply Voltage Levels  
The UC1903 family of quad supply and line monitor integrated circuits will re-  
spond to under- and over-voltage conditions on up to four continuously moni-  
tored voltage levels. An internal op-amp inverter allows at least one of these  
levels to be negative. A separate line/switcher sense input is available to pro-  
vide early warning of line or other power source failures.  
Internal Inverter for Sensing a  
Negative Supply Voltage  
Line/Switch Sense Input for Early  
Power Source Failure Warning  
The fault window adjustment circuit on these devices provides easy program-  
ming of under- and over-voltage thresholds. The thresholds, centered around  
a precision 2.5V reference, have an input hysteresis that scales with the win-  
dow width for precise, glitch-free operation. A reference output pin allows the  
sense input fault windows to be scaled independently using simple resistive  
dividers.  
Programmable Under- and  
Over-Voltage Fault Thresholds  
with Proportional Hysteresis  
A Precision 2.5V Reference  
The three open collector outputs on these devices will sink in excess of 30mA  
of load current when active. The under- and over-voltage outputs respond af-  
ter separate, user defined, delays to respective fault conditions. The third out-  
put is active during any fault condition including under- and over-voltage,  
line/switcher faults, and input supply under-voltage. The off state of this out-  
put indicates a "power OK" situation.  
General Purpose Op-Amp for  
Auxiliary Use  
Three High Current, >30mA,  
Open-Collector Outputs Indicate  
Over-Voltage, Under-Voltage  
and Power OK Conditions  
An additional, uncommitted, general purpose op-amp is also included. This  
op-amp, capable of sourcing 20mA of output current, can be used for a num-  
ber of auxiliary functions including the sensing and amplification of a feed-  
back error signal when the 2.5V output is used as a system reference.  
Input Supply Under-Voltage  
Sensing and Start-Latch  
Eliminate Erroneous Fault Alerts  
During Start-Up  
In addition, these ICs are equipped with a start-latch to prevent erroneous un-  
der-voltage indications during start-up. These parts operate over an 8V to  
40V input supply range and require a typical stand-by current of only 7mA.  
8-40V Supply Operation with  
7mA Stand-By Current  
BLOCK DIAGRAM  
Note: Pin numbers refer to J, N and DW packages.  
4/97  
UC1903  
UC2903  
UC3903  
ABSOLUTE MAXIMUM RATINGS (Note 1)  
Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V  
Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . . . +40V  
Open Collector Output Currents. . . . . . . . . . . . . . . . . . . . 50mA  
Sense 1-4 Input Voltages . . . . . . . . . . . . . . . . . . . -0.3V to +20V  
Line/Switcher Sense Input Voltage . . . . . . . . . . . -0.3V to +40V  
Op-Amp and Inverter Input Voltages . . . . . . . . . . -0.3V to +40V  
Op-Amp and Inverter Output Currents . . . . . . . . . . . . . . -40mA  
Window Adjust Voltage. . . . . . . . . . . . . . . . . . . . . 0.0V to +10V  
Delay Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +5V  
Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . -40mA  
Power Dissipation at TA = 25°C (Note 1) . . . . . . . . . . . 1000mW  
Power Dissipation at TC = 25°C (Note 1) . . . . . . . . . . . 2000mW  
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C  
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C  
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C  
Note 1: Voltages are referenced to ground (Pin 3). Currents  
are positive into, negative out of, the specified terminals.  
Consult Packaging Section of Databook for thermal  
limitations and considerations of package.  
CONNECTION DIAGRAMS  
PLCC-20, LCC-20  
(TOP VIEW)  
Q, L Package  
PACKAGE PIN FUNCTION  
FUNCTION PIN  
+VIN  
1
2
3
4
5
6
7
VREF (2.5V)  
GROUND  
GROUND  
WINDOW ADJUST  
N/C  
SENSE 4 INVERT  
INPUT  
DIL-18, SOIC-18 (TOP VIEW)  
J or N, DW Package  
SENSE 4  
8
SENSE 3  
9
SENSE 2  
10  
11  
12  
13  
14  
15  
16  
17  
SENSE 1  
OV DELAY  
OV FAULT  
UV FAULT  
UV DELAY  
POWER OK  
LINE/SWITCHER  
SENSE  
G.P. OP-AMP OUT  
G.P. OP-AMP N.I.  
G.P. OP-AMP INV.  
18  
19  
20  
Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the  
UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +VIN =  
15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.  
ELECTRICAL CHARACTERISTICS:  
PARAMETERS  
Supply  
TEST CONDITIONS  
UC1903 / UC2903  
UC3903  
TYP  
UNITS  
MIN  
TYP  
MAX  
MIN  
MAX  
Input Supply Current  
No Faults  
7
9
7
11  
18  
mA  
mA  
V
UV, OV and Line Fault  
Fault Outputs Enabled  
10  
7.0  
15  
7.5  
10  
7.0  
Supply Under Voltage  
Threshold (VSUV)  
6.0  
5.5  
8.0  
Minimum Supply to Enable  
Power OK Output  
3.0  
2.5  
4.0  
3.0  
2.5  
4.0  
V
Reference  
Output Voltage (VREF)  
TJ = 25°C  
2.485  
2.465  
2.515 2.470  
2.530  
2.535  
15  
V
Over Temperature  
IL = 0 to 10mA  
+VIN = 8 to 40V  
TJ = 25°C  
2.535 2.465  
V
Load Regulation  
Line Regulation  
1
1
10  
4
1
1
mV  
mV  
mA  
8
Short Circuit Current  
Fault Thresholds (Note 4)  
OV Threshold Adj.  
40  
40  
Offset from VREF as a function of VPIN 4  
Input = Low to High, 0.5V VPIN 4 2.5V  
.230  
.25  
.270  
.230  
.25  
.270  
V/V  
V/V  
UV Threshold Adj.  
Offset from VREF as a function of VPIN 4  
-.270  
-.25  
-.230 -.270  
-.25  
-.230  
Input = High to Low, 0.5V VPIN 4 2.5V  
2
UC1903  
UC2903  
UC3903  
Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the  
UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +VIN =  
15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.  
ELECTRICAL CHARACTERISTICS:  
PARAMETERS  
TEST CONDITIONS  
UC1903/UC2903  
UC3903  
TYP  
UNITS  
MIN  
TYP  
MAX  
MIN  
MAX  
Fault Thresholds (cont.)  
OV & UV Threshold Hyst.  
0.5V VPIN 4 2.5V  
10  
20  
30  
10  
20  
30  
mV/V  
%/V  
OV & UV Threshold Supply +VIN = 8V to 40V  
Sensitivity  
.002  
.01  
.002  
.02  
Adjust Pin (Pin 4)  
Input Bias Current  
0.5V VPIN 4 2.5V  
±1  
±10  
±1  
±12  
µA/V  
Line Sense Threshold  
Line Sense Threshold Hyst.  
Sense Inputs  
Input = High to Low  
1.94  
125  
2.0  
2.06  
225  
1.9  
2.0  
2.1  
V
175  
100  
175  
250  
mV  
Sense 1-4  
Input Bias Current  
Input = 2.8V (Note 2)  
Input = 2.2 (Note 2)  
Input = 2.3V (Note 2)  
1
-1  
1
3
-3  
3
1
-1  
1
6
-6  
6
µA  
µA  
µA  
Line Sense Input  
Bias Current  
OV and UV Fault Delay  
Charging Current  
Threshold Voltage  
Threshold Hysteresis  
Delay  
60  
1.8  
250  
30  
60  
1.8  
250  
30  
µA  
V
Delay Pin = Low to High  
TJ = 25°C  
mV  
Ratio of Threshold Voltage to Charging  
Current  
20  
30  
50  
20  
30  
50  
ms/µF  
Fault Outputs (OV, UV, & Power 0K)  
Maximum Current  
Saturation Voltage  
Leakage Current  
Sense 4 Inverter (Note 3)  
Input Offset Voltage  
Input Bias Current  
Open Loop Gain  
PSRR  
VOUT = 2V  
70  
.25  
3
70  
.25  
3
mA  
V
IOUT = 12mA  
VOUT = 40 V  
.40  
25  
.40  
25  
µA  
2
.1  
8
2
2
.1  
10  
4
mV  
µA  
65  
65  
80  
100  
1
65  
65  
80  
100  
1
dB  
+VIN = 8 to 40 V  
TJ = 25°C  
dB  
Unity Gain Frequency  
Slew Rate  
MHz  
V/µs  
mA  
.4  
.4  
Short Circuit Current  
G.P. Op-Amp (Note 3)  
Input Offset Voltage  
Input Bias Voltage  
Input Offset Current  
Open Loop Gain  
CMRR  
40  
40  
1
.1  
5
2
1
.1  
8
4
mV  
µA  
.01  
120  
100  
100  
1
.5  
.01  
120  
100  
100  
1
1.0  
µA  
65  
65  
65  
65  
65  
65  
dB  
VCM = 0 to +VIN = 2.0V  
+VIN = 8 to 40V  
dB  
PSRR  
dB  
Unity Gain Frequency  
Slew Rate  
MHz  
V/µs  
mA  
.4  
.4  
Short Circuit Current  
TJ = 25°C  
40  
40  
Note 2: These currents represent maximum input bias currents required as the sense inputs cross appropriate thresholds.  
Note 3: When either the G.P. OP-Amp, or the Sense 4 Inverter, are configured for sensing a negative supply voltage, the divider  
resistance at the inverting input should be chosen such that the nominal divider current is 1.4mA. With the divider current  
at or below this level possible latching of the circuit is avoided. Proper operation for currents at or below 1.4mA is 100%  
tested in production.  
Note 4: Reference to pin numbers in this specification pertain to 18 pin DIL N and J packages and 18 pin SOIC DW package.  
3
UC1903  
UC2903  
UC3903  
Typical 2.5V Reference  
Temperature Characteristic  
Typical Fault Delay  
Temperature Characteristic (CDELAY 270pF)  
OPERATION AND APPLICATION INFORMATION  
Figure 1. The UC1903 fault window circuitry generates OV and UV thresholds centered around the 2.5V reference.  
Window magnitude and threshold hysteresis are proportional to the window adjust input voltage at Pin 4.  
4
UC1903  
UC2903  
UC3903  
OPERATION AND APPLICATION INFORMATION  
Setting a Fault Window  
hysteresis at the sense inputs which is always 8% of the  
window magnitude. This is shown graphically in Figure 2.  
The fault thresholds on the UC1903 are generated by cre-  
ating positive and negative offsets, equal in magnitude,  
that are referenced to the chip’s 2.5V reference. The re-  
sulting fault window is centered around 2.5V and has a  
magnitude equal to that of the applied offsets. Simplified  
schematics of the fault window and reference circuits are  
shown in Figure 1 (see previous page). The magnitude of  
the offsets is determined by the voltage applied at the  
window adjust pin, Pin 4. A bias cancellation circuit keeps  
the input current required at Pin 4 low, allowing the use of  
a simple resistive divider off the reference to set the ad-  
just pin voltage.  
Fault Windows Can Be Scaled Independently  
In many applications, it may be desirable to monitor vari-  
ous supply voltages, or voltage levels, with varying fault  
windows. Using the reference output and external resis-  
tive dividers this is easily accomplished with the UC1903.  
Figures 3 and 4 illustrate how the fault window at any  
sense input can be scaled independently of the remaining  
inputs.  
The adjust voltage at Pin 4 is internally applied across R4,  
and an 8k resistor. The resulting current is mirrored four  
times to generate current sources IOA, IOB, IOC, and IOD,  
all equal in magnitude. When all four of the sense inputs  
are inside the fault window, a no-fault condition, Q4 and  
Q5 are turned on. In combination with D1 and D2 this pre-  
vents LOB and LOD from affecting the fault thresholds. In  
this case, the OV and UV thresholds are equal to VREF +  
IOA(R5 + R6) and VREF - IOC(R7 + R8) respectively. The  
fault window can be expressed as:  
Fault window for the Sense Input,  
in percent, is:  
R3 + R1R2/(R1 + R2)  
±10 (VADJ) •  
for:  
,
R3  
R2  
VS (NOM) •  
= 2.5V  
R1 + R2  
VADJ  
4
(1)  
2.5V ±  
.
Figure 3. Using the reference output and a resistive divider, a  
sense input with an independently wider fault window can be  
generated.  
In terms of a sensed nominal voltage level, VS, the win-  
dow as a percent variation is:  
(2)  
VS ± ( 10 VADJ) %.  
When a sense input moves outside the fault window given  
in equation(1), the appropriate hysteresis control signal  
turns off Q4 or Q5. For the under-voltage case, Q5 is dis-  
abled and current source IOB flows through D2. The net  
current through R7 becomes zero as IOB cancels IOC, giv-  
ing an 8% reduction in the UV threshold offset. The over-  
voltage case is the same, with Q4 turning off, allowing IOD  
to cancel the current flow, IOA, through R6. The result is a  
Fault window for the sense input, in percent, is:  
R2  
±10 (VADJ) •  
R1 + R2  
Figure 4. The general purpose op-amp on the UC1903 can be  
used to create a sense input with an independently tighter fault  
window.  
Figure 4 demonstrates one of many auxiliary functions  
that the uncommitted op-amp on the UC1903 can be  
used for. Alternatively, this op-amp can be used to buffer  
high impedance points, perform logic functions, or for  
sensing and amplification. For example, the G.P. op-amp,  
combined with the 2.5V reference, can be used to pro-  
duce and buffer an optically coupled feedback signal in  
isolated supplies with primary side control. The output  
stage of this op-amp is detailed in Figure 5. The NPN  
emitter follower provides high source current capability.  
20mA while the substrate device, Q3, provides good  
transient sinking capability.  
Figure 2. The fault window and threshold hysteresis scale as a  
function of the voltage applied at Pin 4, the window adjust pin.  
5
UC1903  
UC2903  
UC3903  
OPERATION AND APPLICATION INFORMATION (continued)  
SENSE input goes from above to below 2.0V. The line  
sense comparator has approximately 175mV of hystere-  
sis requiring the line/switcher input to reach 2.175V be-  
fore the POWER OK output device can be turned off,  
allowing a no-fault indication. In Figure 7 an example  
showing the use of the LINE/SWITCHER SENSE input  
for early switcher-fault detection is detailed. A sample sig-  
nal is taken from the output of the power transformer, rec-  
tified and filtered, and used at the line/switcher input. By  
adjusting the R2C time constant with respect to the  
switching frequency of the supply and the hold up time of  
the output capacitor, switcher faults can be detected be-  
fore supply outputs are significantly affected.  
Figure 5. The G.P. op-amp on the UC1903 has a high source  
current (20mA) capability and enhanced transient sinking capa-  
bility through substrate device Q3.  
Sensing a Negative Voltage Level  
The UC1903 has a dedicated inverter coupled to the  
sense 4 input. With this inverter, a negative voltage level  
can be sensed as shown in Figure 6. The output of the in-  
Figure 7. The line/switcher sense input can be used for an  
early line or switcher fault indication.  
verter is an unbiased emitter follower. By tying the invert- OV and UV Comparators Maintain Accurate  
ing input, Pin 5, high the output emitter follower will be Thresholds  
reverse biased, leaving the sense 4 input in a high imped- The structure of the OV and UV comparators, shown in  
ance state. In this manner, the sense 4 input can be used, Figure 8 results in accurate fault thresholds even in the  
as the remaining sense inputs would be, for sensing posi- case where multiple sense inputs cross a fault threshold  
tive voltage levels.  
simultaneously. Unused sense inputs can be tied either to  
the 2.5V reference, or to another, utilized, sense input.  
The four under- and over-voltage sense inputs on the  
UC1903 are clamped as detailed on the Sense 1 input in  
Figure 8. The series 2k resistor, R1, and zener diode Z1,  
prevent extreme under- and over-voltage conditions from  
inverting the outputs of the fault comparators. A parasitic  
diode, D1, is present at the inputs as well. Under normal  
operation it is advisable to insure that voltage levels at all  
of the sense inputs stay above -0.3V. The same type of  
input protection exists at the line sense input, Pin 15, ex-  
cept a 5k series resistor is used.  
Note: A similar scheme w/the G.P. op-amp will allow a sec-  
ond negative supply to be monitored.  
The fault delay circuitry on the UC1903 is also shown in  
Figure 8. In the case of an over-voltage condition at one  
of the sense inputs Q20 is turned off, allowing the internal  
60µA current source to charge the user-selected delay  
capacitor. When the capacitor voltage reaches 1.8V, the  
OV and POWER OK outputs become active low. When  
the fault condition goes away Q20 is turned back on, rap-  
idly discharging the delay capacitor. Operation of the un-  
der-voltage delay is, with appropriate substitutions, the  
same.  
Figure 6. Inverting the sense 4 input for monitoring a negative  
supply is accommodated with the dedicated inverter.  
Using The Line/Switcher Sense Output  
The line switcher sense input to the UC1903 can be used  
for early detection of line, switcher, or other power source,  
failures. Internally referenced to 2.0V, the line sense com-  
parator will cause the POWER OK output to indicate a  
fault (active low) condition when the LINE/SWITCHER  
6
UC1903  
UC2903  
UC3903  
OPERATION AND APPLICATION INFORMATION (continued)  
Figure 8. The OV and UV comparators on the UC1903 trigger respective fault delay circuits when one or more of the sense inputs  
move outside the fault window. Input clamps insure proper operation under extreme fault conditions. Terminating the UV delay ca-  
pacitor to VREF assures correct logic at power up.  
Start Latch and Supply Under-Voltage Sense Allow  
Predictable Power-Up  
The supply under-voltage sense and start-latch circuitry  
on the UC1903 prevents fault indications during start-up  
or low input supply (+VIN) conditions. When the input sup-  
ply voltage is below the supply under-voltage threshold  
the OV and UV fault outputs are disabled and the  
POWER OK output is active low. The POWER OK output  
will remain active until the input supply drops below ap-  
proximately 3.0V. With +VIN below this level, all of the  
open collector outputs will be off.  
When the input supply is low, the under-voltage sense cir-  
cuitry resets the start-latch. With the start-latch reset, the  
UV fault output will remain disabled until the input supply  
rises to its normal operating level (8-40V), and all of the  
sense inputs are above the under-voltage threshold. This  
allows slow starting, or supply sequencing, without an ar-  
tificial under-voltage fault indication. Once the latch is set,  
the UV fault output will respond if any of the sense inputs  
drop below the under-voltage threshold.  
UNITRODE CORPORATION  
7 CONTINENTAL BLVD. MERRIMACK, NH 03054  
TEL. (603) 424-2410 FAX (603) 424-3460  
7
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent  
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Copyright 1999, Texas Instruments Incorporated  

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