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NCV8800 Series Synchronous Buck Regulator with 1.0 Amp Switch
The NCV8800 is an automotive synchronous step-down buck regulator. This part provides an efficient step-down voltage compared to linear regulators. The NCV8800 uses very few external components allowing for maximum use of printed circuit board space.
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* * * * * * * * * * * * * * * * * * * *
Output Voltage Options: 2.6 V, 3.3 V, 5.0 V, 7.5 V 3.0% Output 3.5 V Operation AUXILIARY Hold Up Pin (for Cranking Conditions) On-Chip Switching Power Devices (0.4 RDS(ON)) Constant Frequency Synchronous Operation On-Chip Charge Pump Control Circuitry Nonoverlap Logic Power Up Sequencing Control Option (2.6 V and 3.3 V Only) ENABLE Battery Voltage Capable Option Selectable Reset Delay Dual Pin Feedback Connection V2TM Control Topology Internally Fused Leads in SO-16L Package NCV Prefix for Automotive and Other Applications Requiring Site and Change Control Telecommunications Mobile Multimedia Instrumentation Automotive Entertainment Systems
100 90 80 EFFICIENCY (%) 70 60 50 40 30 20 10 0 0 VIN = 13.5 V L =100 mH 100 200 300 400 500 600 700 800 VOUT = 3.3 V VOUT = 2.6 V VOUT = 7.5 V VOUT = 5.0 V
16 1
SO-16L DW SUFFIX CASE 751G
PIN CONNECTIONS AND MARKING DIAGRAM
1 AUXILIARY ENABLE RESET GND GND DELAY FB1 FB2 x NCV8800xy AWLYYWW 16 VIN CP SWITCH GND GND VIN2 NC COMP
Typical Applications
= Voltage Ratings as Indicated Below: 2 = 2.6 V 3 = 3.3 V 5 = 5.0 V 7 = 7.5 V y = ENABLE Option as Indicated Below: S = Sequenced H = High Voltage A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet.
LOAD CURRENT (mA)
Figure 1. Efficiency vs. Load Current
(c) Semiconductor Components Industries, LLC, 2003
1
September, 2003 - Rev. 10
Publication Order Number: NCV8800/D
NCV8800 Series
Auxiliary Supply (optional) External Regulator
0.01 F MRA4004T3 0.1 F 5.1 k AUXILIARY ENABLE RESET GND GND DELAY FB1 FB2 VIN CP SWITCH GND GND VIN2 NC COMP 10 F* 100 1.0 k 100 H 0.1 F VOUT *The supply capacitor must be located physically close to the IC pins. VBAT
NCV8800
0.01 F
RESET
100 F
Figure 2. Application Diagram
Figure 3. Typical Operation With An 8.0 W Load
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NCV8800 Series
MAXIMUM RATINGS*
Rating Supply Voltages, VIN, VIN2 AUXILIARY ENABLE (Sequenced Option) ENABLE (High Voltage Option) RESET DELAY SWITCH (V5VSENSE = 0 V) Operating Junction Temperature Storage Temperature Range ESD - Human Body Model (AUXILIARY, ENABLE, RESET, DELAY, FB1, FB2, CP, SWITCH, COMP) Human Body Model (VIN, VIN2) Machine Model (All Pins) Package Thermal Resistance, SO-16L Junction-to-Case, RqJC Junction-to-Ambient, RqJA Lead Temperature Soldering: 1. 60 second maximum above 183C. 2. -5C/+0C allowable condition. *The maximum package power dissipation must be observed. Reflow (SMD Style Only) (Note 1) Value -0.3 to 45 -0.3 to 8.0 -0.3 to 7.0 -0.3 to 8.0 -0.3 to 30 -0.3 to 7.0 -1.0 to 45 -40 to 150 -55 to 150 2.0 1.3 200 Unit V V V V V V V C C kV kV V C/W 18 80 240 Peak (Note 2) C
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NCV8800 Series
ELECTRICAL CHARACTERISTICS (-40C TJ 125C; Sequenced ENABLE Option: 3.5 V VIN 16 V,
3.5 V VIN2 16 V, AUXILIARY = 6.0 V, ENABLE = 5.0 V; High Voltage ENABLE Option: 6.0 V VIN 16 V, 6.0 V VIN2 16 V; unless otherwise stated.) Characteristic Test Conditions Min Typ Max Unit
General Quiescent Current (VIN2) Sleep Mode Operating ENABLE = 0 V, VIN = 12.6 V, TJ = -40C ENABLE = 0 V, VIN = 12.6 V, TJ = 25C, 125C ENABLE = 5.0 V, VIN = 13.5 V, IOUT = 0 - - Note 3 - - - 180 85 150 - - - 200 90 165 40 30 15 230 95 200 A A mA kHz % C
Switching Frequency Switching Duty Cycle Thermal Shutdown Feedback Feedback Voltage Threshold, 2.6 V Option (VFB) Feedback Voltage Threshold, 3.3 V Option (VFB) Feedback Voltage Threshold, 5.0 V Option (VFB) Feedback Voltage Threshold, 7.5 V Option (VFB) RESET Undervoltage RESET Threshold, 2.6 V Option Undervoltage RESET Hysteresis, 2.6 V Option Overvoltage RESET Threshold, 2.6 V Option Overvoltage RESET Hysteresis, 2.6 V Option Undervoltage RESET Threshold, 3.3 V Option Undervoltage RESET Hysteresis, 3.3 V Option Overvoltage RESET Threshold, 3.3 V Option Overvoltage RESET Hysteresis, 3.3 V Option Undervoltage RESET Threshold, 5.0 V Option Undervoltage RESET Hysteresis, 5.0 V Option Overvoltage RESET Threshold, 5.0 V Option Overvoltage RESET Hysteresis, 5.0 V Option Undervoltage RESET Threshold, 7.5 V Option Undervoltage RESET Hysteresis, 7.5 V Option Overvoltage RESET Threshold, 7.5 V Option Overvoltage RESET Hysteresis, 7.5 V Option 3. Guaranteed By Design. VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing VOUT Increasing VOUT Decreasing
- - - -
2.522 3.201 4.850 7.275
2.6 3.3 5.0 7.5
2.678 3.399 5.150 7.725
V V V V
2.44 2.40 - 40 VFB + 0.04 VFB - 40 3.10 3.04 - 50 VFB + 0.05 VFB - 50 4.70 4.61 - 75 VFB + 0.075 VFB - 75 7.05 6.92 - 115 VFB + 0.115 VFB - 115
- - - - - - - - - - - - - - - - - - - - - - - -
VFB VFB - 0.04 - 2.80 2.76 - VFB VFB - 0.05 - 3.56 3.51 - VFB VFB - 0.075 - 5.39 5.31 - VFB VFB - 0.115 - 8.08 7.96 -
V V mV V V mV V V mV V V mV V V mV V V mV V V mV V V mV
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NCV8800 Series
ELECTRICAL CHARACTERISTICS (continued) (-40C TJ 125C; Sequenced ENABLE Option: 3.5 V VIN 16 V,
3.5 V VIN2 16 V, AUXILIARY = 6.0 V, ENABLE = 5.0 V; High Voltage ENABLE Option: 6.0 V VIN 16 V, 6.0 V VIN2 16 V; unless otherwise stated.) Characteristic Test Conditions Min Typ Max Unit
RESET RESET Leakage Current RESET Output Low Voltage RESET Delay RESET = 5.25 V IOUT = 1.6 mA DELAY Connected to FB1, FB2 DELAY = 0 V - - 28.70 14.35 - - 32.60 16.30 25 0.4 36.66 18.33 A V ms ms
ENABLE ENABLE Threshold Increasing Decreasing - ENABLE = 5.25 V, VIN2 = 13.5 V 1.1 1.0 100 50 1.9 1.6 250 100 2.3 2.2 550 200 V V mV kW
ENABLE Hysteresis ENABLE Input Resistance DELAY DELAY Input Current SWITCH SWITCH ON Resistance DELAY = 5.15 V
4.0
10
16
A
ISWITCH = 0.5 A, TJ = -40C, 25C ISWITCH = 0.5 A, TJ = 125C -
- - 1.0
0.40 0.55 1.6
0.60 0.75 2.5
A
Current Limit Error Amplifier Error Amplifier Transconductance 2.6 V Option 3.3 V Option 5.0 V Option 7.5 V Option
2.58 V FB1 2.62 V 2.58 V FB2 2.62 V 3.275 V FB1 3.325 V 3.275 V FB2 3.325 V 4.962 V FB1 5.038 V 4.962 V FB2 5.038 V 7.442 V FB1 7.558 V 7.442 V FB2 7.558 V Note 4
0.55 0.43 0.28 0.19
- - - -
2.10 1.65 1.09 0.73
1/m
Error Amplifier Bandwidth Output Tracking (Sequencing) Feedback to ENABLE Tracking Voltage, 2.6 V Option Feedback to ENABLE Tracking Voltage, 3.3 V Option 4. Guaranteed By Design.
1.0
-
-
MHz
- -
60 80
67 85
75 90
% %
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NCV8800 Series
PACKAGE PIN DESCRIPTION
PACKAGE LEAD # 1 2 3 4, 5, 12, 13 6 7 8 9 10 11 14 15 16 LEAD SYMBOL AUXILIARY ENABLE RESET GND DELAY FB1 FB2 COMP NC VIN2 SWITCH CP VIN FUNCTION Alternate path for voltage input to the IC. Sense for powerup. This pin must be high before SWITCH turns on. CMOS compatible open drain output lead. RESET goes low whenever FB1 or FB2 is below the RESET low threshold, or above the RESET high threshold. Ground. RESET delay control. Time is doubled when pin moved to FB1 or FB2 from 0 V. Voltage feedback to error amplifier. Shorted with FB2. Voltage feedback to error amplifier. Shorted with FB1. Loop compensation node for error amplifier. (1.0 k and 0.1 F to ground). No connection. Supply input voltage for internal bias circuitry. Drive for external inductor. Node for charge pump bootstrap capacitor. Supply input voltage for output drivers.
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100 W VIN2 0.1 mF AUXILIARY BIAS
UVLO OVLO
CP MRA4004T3 Current Limit CP Control
UVLO OVLO
VIN VBAT
ENABLE
Power Up/Down Sequence and ENABLE
0.01 F 0.4
FB1
+ -
PWM COMP R Q
Figure 4. Block Diagram
FB2 200 kHz OSC COMP 1k 0.1 mF
Error Amp ART Ramp
LATCH S Q
Nonoverlap Logic and Drive 0.4 Thermal Shutdown SWITCH 33 H 100 F 2.6 V
NCV8800 Series
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Current Limit
GND
- + Over/Under Voltage RESET COMP POR Timer RESET 5.1 k
- + Bandgap Voltage Reference DELAY
NCV8800 Series
CIRCUIT DESCRIPTION
ENABLE RESET
The NCV8800 remains in sleep mode drawing less than 25 A of quiescent current until the ENABLE pin is brought high powering up the device. There are two options available for the ENABLE feature. * Option 1 (Sequenced). The output voltage tracks the ENABLE pin with a maximum delta voltage between them (reference the Output Tracking specs in the Electrical Characteristics). This allows the device to be used with microprocessors requiring dual supply voltages. One voltage is typically needed to power the core of the microprocessor, and another high voltage is needed to power the microprocessor I/O. * Option 2 (High Voltage). This option removes the sequencing feature above, and allows the device to be controlled up to the battery voltage on the ENABLE pin with an external resistor (10 k). See Figure 5.
10 k
The RESET is an open drain output which goes low when the feedback voltage on FB1 and FB2 goes below the undervoltage RESET threshold. The output also goes low when the voltage on FB1 and FB2 exceeds the overvoltage RESET threshold. The RESET output is an open drain output capable of sinking 1.6 mA.
FB1 and FB2
FB1 and FB2 are the feedback pins to the error amplifier, which control the output SWITCH as needed to the regulated output. They are internally wire bonded to the same electrical connection providing double protection for an open circuit which would cause the buck regulator to rise above its desired output reaching the voltage on VIN. These pins also provide the feedback path for the RESET function.
DELAY
VIN ENABLE VBAT
There are two options for the delay time for the RESET to go low. Connecting the pin to GND will provide a minimum of 14 ms. Connecting the pin to FB1 and FB2 will provide a minimum of 28 ms. Absolute max voltage on the DELAY pin is 7.0 V. Use a resistor divider to run off higher voltages. The 7.5 V option will require this divider (see Figure 6).
VOUT
Figure 5. Switched Battery Application AUXILIARY
DELAY (7.0 V max)
The AUXILIARY pin provides an alternate path for the IC to maintain operation. The AUXILIARY pin is diode OR'd with the VIN pin to the control circuitry (the DMOS output drivers are not included). If the voltage (VIN) from the battery dips as low as 3.5 V during a crank condition, the NCV8800 will maintain operation through a 6.0 V(min) connection on the AUXILIARY pin. Using this feature is optional. This pin should be grounded when not in use.
VIN
Figure 6. COMP
The COMP pin provides access to the error amplifiers output. Switching power supplies work as feedback control systems, and require compensation for stability. A 1.0 k resistor and 0.1 F capacitor work well in the application in Figure 2.
CP
Normal supply voltage input. An external diode must be provided to afford reverse battery protection.
SWITCH
DMOS output drivers with 0.75 max push/pull capability. Non-overlap logic is provided to guarantee shoot through current is minimized.
The on-chip DMOS drivers require the gates of the devices to be pulled above their drain voltage. An external capacitor located between the SWITCH output, and the CP pin provides the charge pump action to drive the gate of the high-side driver high enough to turn the device on.
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NCV8800 Series
APPLICATIONS INFORMATION The V2 control method is illustrated in Figure 8. The output voltage is used to generate both the error signal and the ramp signal. Since the ramp signal is simply the output voltage, it is affected by any change in the output regardless of the origin of the change. The ramp signal also contains the DC portion of the output voltage, which allows the control circuit to drive the main switch to 0% or 100% duty cycle as required. A change in line voltage changes the current ramp in the inductor, affecting the ramp signal, which causes the V2 control scheme to compensate the duty cycle. Since the change in the inductor current modifies the ramp signal, as in current mode control, the V2 control scheme has the same advantages in line transient response. A change in load current will have an effect on the output voltage, altering the ramp signal. A load step immediately changes the state of the comparator output, which controls the main switch. Load transient response is determined only by the comparator response time and the transition speed of the main switch. The reaction time to an output load step has no relation to the crossover frequency of the error signal loop, as in traditional control methods. The error signal loop can have a low crossover frequency, since transient response is handled by the ramp signal loop. The main purpose of this "slow" feedback loop is to provide DC accuracy. Noise immunity is significantly improved, since the error amplifier bandwidth can be rolled off at a low frequency. Enhanced noise immunity improves remote sensing of the output voltage, since the noise associated with long feedback traces can be effectively filtered. Line and load regulations are drastically improved because there are two independent voltage loops. A voltage mode controller relies on a change in the error signal to compensate for a derivation in either line or load voltage. This change in the error signal causes the output voltage to change corresponding to the gain of the error amplifier, which is normally specified as line and load regulation. A current mode controller maintains fixed error signal under deviation in the line voltage, since the slope of the ramp signal changes, but still relies on a change in the error signal for a deviation in load. The V2 method of control maintains a fixed error signal for both line and load variations, since both line and load affect the ramp signal.
Constant Frequency Operation
VOUT
NCV8800 Power Up/Down Sequence and ENABLE
REX FB1 FB2 *The value of R1 is dependent on the output voltage option and is between 25 k and 200 k.
Switch
56 A R1*
R2 21.4 k
Error Amp - + 1.20 V
Figure 7. Increasing the Output Voltage
Adjustments to the output voltage can be made with an external resistor (REX). The increase in output voltage will typically be 56 A x REX. Caution and consideration must be given to the tracking feature and temperature coefficient and matching of internal and external resistors. Output tracking always follows the Feedback pins (FB1 and FB2). The typical temperature coefficient for R1 and R2 is +4600 ppm/C. THEORY OF OPERATION
V2 Control Method
The V2 method of control uses a ramp signal that is generated by the ESR of the output capacitors. This ramp is proportional to the AC current through the main inductor and is offset by the value of the DC output voltage. This control scheme inherently compensates for variations in either line or load conditions, since the ramp signal is generated from the output voltage itself. This control scheme differs from traditional techniques such as voltage mode, which generates an artificial ramp, and current mode, which generates a ramp from inductor current.
PWM Comparator
+
GATE(H) GATE(L)
Ramp Signal Error Amplifier Error Signal COMP
-
Figure 8. V2 Control Block Diagram
+
-
Output Voltage Feedback
Reference Voltage
During normal operation, the oscillator generates a 200 kHz, 90% duty cycle waveform. The rising edge of this waveform determines the beginning of each switching cycle, at which point the high-side switch will be turned on. The high-side switch will be turned off when the ramp signal intersects the output of the error amplifier (COMP pin voltage). Therefore, the switch duty cycle can be modified to regulate the output voltage to the desired value as line and load conditions change.
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NCV8800 Series
Thermal Resistance, Junction to Ambient, RqJA, (C/W)
The major advantage of constant frequency operation is that the component selections, especially the magnetic component design, become very easy. Oscillator frequency is fixed at 200 kHz.
Start-Up
100 90 80 70 60 50 40 0 0.5 1.0 1.5 2.0 Copper Area (inch2) 2.5 3.0
After the NCV8800 is powered up, the error amplifier will begin linearly charging the COMP pin capacitor. The COMP capacitance and the source current of the error amplifier determine the slew rate of COMP voltage. The output of the error amplifier is connected internally to the inverting input of the PWM comparator and it is compared with the divided down output voltage FB1/FB2 at the non-inverting input of the PWM comparator. At the beginning of each switching cycle, the oscillator output will set the PWM latch. This causes the high-side switch to turn on and the regulator output voltage to ramp up. When the divided down output voltage achieves a level set by the COMP voltage, the high-side switch will be turned off. The V2 control loop will adjust the high-side switch duty cycle as required to ensure the regulator output voltage tracks the COMP voltage. Since the COMP voltage increases gradually, Soft Start can be achieved.
Overcurrent Protection
Figure 9. 16 Lead SOW (4 Leads Fused), qJA as a Function of the Pad Copper Area (2 oz. Cu. Thickness), Board Material = 0.0625, G-10/R-4 Heat Sinks
The output switch is protected on both the high side and low side. Current limit is set at 1.0 A (min).
A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RqJA:
RqJA + RqJC ) RqCS ) RqSA
(3)
where: RqJC = the junction-to-case thermal resistance, RqCS = the case-to-heatsink thermal resistance, and RqSA = the heatsink-to-ambient thermal resistance. RqJC appears in the package section of the data sheet. Like RqJA, it too is a function of package type. RqCS and RqSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers.
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NCV8800 Series
ORDERING INFORMATION
Device NCV8800SDW26 NCV8800SDW26R2 NCV8800HDW26 NCV8800HDW26R2 NCV8800SDW33 NCV8800SDW33R2 NCV8800HDW33 NCV8800HDW33R2 NCV8800HDW50 NCV8800HDW50R2 NCV8800HDW75 NCV8800HDW75R2 7.5 75V 5.0 50V High Voltage 33V 3.3 High Voltage Sequenced SO 16L SO-16L 2.6 26V High Voltage Sequenced Output Voltage ENABLE Option Package Shipping 46 Units/Rail 1000 Tape & Reel 46 Units/Rail 1000 Tape & Reel 46 Units/Rail 1000 Tape & Reel 46 Units/Rail 1000 Tape & Reel 46 Units/Rail 1000 Tape & Reel 46 Units/Rail 1000 Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
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NCV8800 Series
PACKAGE DIMENSIONS
SO-16L DW SUFFIX CASE 751G-03 ISSUE B
D
16 M 9
A
q
NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DIMENSIONS D AND E DO NOT INLCUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 2.35 2.65 0.10 0.25 0.35 0.49 0.23 0.32 10.15 10.45 7.40 7.60 1.27 BSC 10.05 10.55 0.25 0.75 0.50 0.90 0_ 7_
H
B
1 16X
8
B TA
S
B B
S
0.25
M
A
h X 45 _
SEATING PLANE
M
8X
0.25
E
A1
14X
e
T
C
V2 is a trademark of Switch Power, Inc.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada JAPAN: ON Semiconductor, Japan Customer Focus Center 2-9-1 Kamimeguro, Meguro-ku, Tokyo, Japan 153-0051 Phone: 81-3-5773-3850 ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative.
L
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NCV8800/D

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