Texas Instruments UC3904N, UC3904DWTR, UC3904DW, UC2904J, UC2904DW Datasheet

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BLOCK DIAGRAM
Note: Pin Numbers refer to J, N, and DW Packages.
4/97
The UC1904 Quad Supp ly Moni tor will respo nd to un der- and over-volt­age conditi o ns on u p to four c on ti nu ou s ly m on itor ed voltage levels. Four independen t positive voltages can be monitor ed or, alternatively, two of the sense in puts are preset t o monitor -5V and -12V supplies. The de­vice also monitors Over-Current and Line Sense inputs, both with preci­sion input thresholds.
Four open collector outputs on the UC1904 give the following re­sponses: 1. The
OV/OC output is a l a tc h ed over-voltag e, or over-current response. 2. A Power Good signal responds low with any fault detection – on power-up a pro grammable delay is use d to hol d this output low for a system Power On Reset signal. 3. The
PWRW output responds only to a Line Sense inp ut, for ea rl y warning of power failu res. 4. The last open collector, the ON/
OFF output, gener ates a delayed supply OFF control signal in re sponse to an OFF input comma nd, under-voltage condition, or line fault detection.
The OV-UV fault window is adjustable with a programming input. The thresholds are centered around the precision 2.5V reference, with a scaled hystere sis for precise, glitch free operation. In the positive mode of operation, the fault windows at each of the sens e inputs can be inde­pendently s c a l ed u sing external resis tors and the 2.5V r eference output. An Auto Restar t functio n couples with the under-voltage and line sens­ing circuits to allow controlled power supply start-up and shutdown.
This device will operate over a supply range of 4.75V to 18V. The device is available in a DIP, SOIC, or PLCC outline. This device is ESD pro­tected on all pins.
Inputs for Monitoring Up to Four Supply Voltages
Two Inputs Preset for -5V and -12V Monitoring, or Programmable Positive Levels
Precision 2.5V Reference
Separate Inputs for Over-Current and
Line Fault Sensing
Adjustable Under- to Over-Voltage Fault Windows
Latched Over-Voltage and Over-Current Output
Power Good and Power Warning Outputs
Auto Restart Function with ON/OFF Control, and Programmable Delay
Programmable Pwr On Reset Delay
UC1904 UC2904 UC3904
Precision Quad Supply and Line Monitor
FEATURES
DESCRIPTION
UC1904 UC2904 UC3904
Input Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Sense Inputs, S1 And S2, Other Analog And Logic Inputs
Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -0.3V to 10V
Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA
Sense Input S3, (-12V Sense Input)
Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -18V to 10V
Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA
Sense Input S4, (-5V Sense Input)
Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -10V to 10V
Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA
Open Collector Outputs
Maximum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Maximum Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Reference Output Current . . . . . . . . . . . . . . . Internally Limited
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
PACKAGE PIN FUNCTION
FUNCTION PIN
2.5V 1 POR DLY 2 N.C. 3 S1 4 S2 5 S3 6 S4 7 N.C. 8 LS Input 9 OC Input 10 PWRW Out 11 PG Out 12 OV/OC Out 13 V
IN
14
ON/
OFF Out 15
OFF DLY
16 ON/OFF Input 17 ARST Input 18 W
ADJ
19 Gnd 20
DIL-18, SOIC-18 (TOP VIEW) J or N PACKAGE, DW PACKAGE
PLCC-20 (TOP VIEW) Q PACKAGE
CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Note 1: Unless otherwise indicated, voltages are reference to ground and currents are positive into, negative out of, the speci­fied terminals.
Unless otherwise stated, these specifications hold for TA = 0 to 70°C for the UC3904, -40 to +85°C for the UC2904, and -55 to +1 25°C for the UC1904, +VIN = 15V, W
ADJ
= 0.5V, Sense Inputs 1-4, OC and LS Inputs = 2.5V. The ON/OF F In pu t
and the ARST Input = 0V.
ELECTRICAL CHARACTERISTICS:
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Supply
V
IN
Supply Current VIN = 15V 3.2 4.5 mA
V
IN
UVLO Threshold Low to High 4.5 4.75 V UVLO Threshold Hysteresis 50 mV Minimum VIN to Enable PG Out 0.8 1.5 V
Reference
Output Voltage(V
REF
)T
J
= 25°C 2.475 2.5 2.525 V Over Temperature, UC3904 2.47 2.53 V Over Temperature, UC2904 & UC1904 2.465 2.535 V
Load Regulation I
OUT
= 0 to 4mA 6 mV
Line Regulation V
IN
= 4.75 to 18V 5 mV
Short Circuit Current V
REF
= 0V 17 mA
OV UV Window, LS Input, OC Input, ARST Input, and
ON/OFF Input Thresholds
Over-Voltage Thresholds W
ADJ
= 0.25V, Offset from V
REF
, Input L to H 110 125 140 mV
S1, S2 W
ADJ
= 0.5V, Offset from V
REF
, Input L to H 230 250 270 mV
W
ADJ
= 1V, Offset from V
REF
, Input L to H 460 500 540 mV
Over-Voltage Thresholds W
ADJ
= 0.25V, Offset from V
REF
, Input L to H 110 125 145 mV
S3, S4 Positive Mode W
ADJ
= 0.5V, Offset from V
REF
, Input L to H 230 250 280 mV
W
ADJ
= 1V, Offset from V
REF
, Input L to H 460 500 550 mV
2
UC1904 UC2904 UC3904
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
OV UV Window, LS Input, OC Input, ARST Input, and
ON/OFF Input Thresholds (cont.)
Under-Voltage Threshold s W
ADJ
= 0.25V, Offset from V
REF,
Input H to L -140 -125 -110 mV
S1, S2 W
ADJ
= 0.5V, Offset from V
REF,
Input H to L -270 -250 -230 mV
W
ADJ
= 1V, Offset from V
REF,
Input H to L -540 -500 -460 mV
Under-Voltage Threshold s W
ADJ
= 0.25V, Offset from V
REF,
Input H to L -150 -125 -110 mV
S3, S4 Positive Mode W
ADJ
= 0.5V, Offset from V
REF,
Input H to L -285 -250 -230 mV
W
ADJ
= 1V, Offset from V
REF,
Input H to L -555 -500 -460 mV
OV and UV Threshold Hysteresis As a Function of W
ADJ
30 50 70 mV/V
S3 Negative Mode Thresholds Over-Voltage , W
ADJ
= 0.5V, Input H to L -13.52 -13.2 -12.88 V
Under-Voltage, W
ADJ
= 0.5V, Input L to H -11.06 -10.8 -10.54 V
Hysteresis, W
ADJ
= 0.5V 80 120 160 mV
S4 Negative Mode Thresholds Over-Voltage , W
ADJ
= 0.5V, Input H to L -5.63 -5.5 -5.37 V
Under-Voltage, W
ADJ
= 0.5V, Input L to H -4.61 -4.5 -4.39 V
Hysteresis, W
ADJ
= 0.5V 30 50 70 mV
W
ADJ
Input Bias Current 0.25V < W
ADJ
<1.0V -5 5
µ
A/V
LS Threshold Input = H to L 1.96 2 2.04 V
Threshold hysteresis 65 100 125 mV
OC Threshold Input = H to L 1.9 2 2.1 V
Threshold hysteresis 50 100 150 mV
ARST Input Threshold Input = L to H 2.25 2.5 2.75 V
Input = H to L 0.56 0.625 0.69 V
ON/OFF Input Threshold Input high level 1.74 2.4 V
Input low level 0.6 1.35 V
Sense and Logic Input Bias Currents
Sense 1-4, Positive Mode Input = 2.8V 250 800 nA
Input = 2.2V -1000 -250 nA
Sense 3 Negative Mode Input = -12V -700 -500 -300
µ
A
Sense 4 Negative Mode Input = -5V -700 -500 -300
µ
A Line, and OC Inputs Input = 2.2V 300 1000 nA ON/OFF Input In pu t = 2.5V 150 600 nA ARST Input Input = 0.5 -2000 -700 nA
Open Collector Outputs (
OV/OC Out, PG Out, PWRW Out, ON/OFF Out)
Saturation Voltage I
OUT
= 10mA 0.2 0.4 V
Leakage current V
OUT
= 20V 5
µ
A
POR Delay
Delay 160 250 350 ms/µF Internal Pullup Current 9
µ
A Threshold Low to High 2.25 V
OFF Delay
Delay 120 185 250 ms/µF Internal Pullup current 12
µ
A Threshold Low to High 2.25 V
OV Fault Delay
Delay 10 20 50
µ
s
Unless otherwise stated, these specifications hold for T
A
= 0 to 70°C for the UC3904, -40 to
+85°C for the UC2904, and -55 to +1 25°C for the UC1904, +VIN = 15V, W
ADJ
= 0.5V, Sense
Inputs 1-4, OC and LS Inputs = 2.5V. The ON/OFF Input and the ARST Input = 0V.
ELECTRICAL CHARACTERISTICS (cont):
3
PIN FUNCTIONAL DESCRIPTION
2.5V: This is the output of the precision 2.5V reference. ARST Input: This input, with a 4:1 hystereti c threshold,
is used to sequence a power system through the Auto ReStarT cycle. A delayed representation of a supply out-
put voltage is used at this pin to provide adequate startup time for the power system, and a minimum power-off pe­riod.
Gnd: Reference point for the internal reference and all thresholds, as well as the return for the remainder of the device.
LS Input: The Line Sense input is used to monitor a volt- age that varies with the input line voltage to a system. The input is compared to a precision 2.0V level and is used to acti vate the
PWRW and PG outputs, as well as
triggering the Auto Restart sequence. OC Input: The Over -Current input can be used to re-
spond to an invert ed over-current signal. A low level sig­nal at this i nput la tches in a fault indication at the
OV/OC
output. OFF DLY: This pin functions similarly to the POR DLY
pin to delay the turn-on of the ON/
OFF output trans istor.
The charging current an d upper thre shold are 12µA and
2.1V.
ON/OFF Input: With a high level at this input the ON/
OFF Out pin is acti vated af ter a user-programmable
delay. A high level also activates the PG Out pin, and r e­sets the OV/OC fault latch.
On/
Off Out: This output is a n open collector output that
is activated by the
ON/OFF Input, or the Auto Restart cir­cuitr y. Saturation voltage on this and all the open collec­tor outputs is rated at 10mA of current.
OV/OC Out: In response to either an Over -Voltage or Over-Current situation this output is latched active low.
There is nominal 20µ s delay in the OV path to the fault latch, providi ng reje ctio n to transient overshooting on the monitored voltages. The low condition is cleared when
the fault latch is reset by the
ON/OFF In put, or a UVLO
condition on the device. POR DLY: This pin is used, w i th an exter n al capac itor, to
program a Power-On-Reset delay. This delay is reset whenever there is a U V co nditi on at one of the S1-S4 in­puts, and then triggered upon the clearing of the UV con­dition. When reset, the voltage across the capacitor is quickly discharged to near zero volts, and the PG Out pin goes active low. Once triggered the capacitor is charged by a 9µA cur rent source. The PG Out pin remains active low until the delay capacitor voltage reaches a 2.1V threshold.
PG Out: During any fault, under-voltage, or UVLO condi­tion this output is low. A Power Good indicati on (output off) is given when all suppl y conditions are within defined operating limits. During power-up the PG signal is de­layed by a programmable Power O n Reset delay. During UVLO the output i s active low as long as the input s up­ply, V
IN
, is above approximately 1.0V.
PWRW Out: When a low line condition is sensed by the LS Input this output goes low. This output is disabled (off) during a UVLO condition.
S1-S4: These are the sense inputs for OV and UV moni-
toring of external volt ages. All four inputs can be used to sense posi tive volt ag es with a simple di vi d er t o s cale the voltage level to the 2.5V centered window. The S3 and S4 inputs can al so be used to sense -12V and -5V sup­plies respectively with no external components. This is done with internal precision resistor dividers and two source only op-amps that are dis abled when the pins are used in the positive mode.
V
IN
: Input supply for the UC1904. The device is opera-
tional with 4.75V to 18V on this pin.
W
ADJ
: The W
ADJ
input is us ed to program the OV and UV window thresholds. The OV-UV window is centered around the 2.5V reference and is nominally ±20% per volt on the W
ADJ
input pin.
UC1904 UC2904 UC3904
4
UC1904 UC2904 UC3904
UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (6 03 ) 42 4- 24 10 • FAX (603) 424-3460
Note: Pin Numbers refer to J, N, and DW Packages.
5
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