ON Semiconductor NCV891234 User Manual
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ON Semiconductor NCV891234 User Manual

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NCV891234, NCV891334
NC V891234, NCV891334
Evaluation Board
User's Manual

Description

The NCV891x34 is a Dual Mode regulator intended for
Automotive, battery−connected applications. The output is
fixed to either 3.3 V or 5.0 V, capable of delivering 2.0 A
(NCV891234) or 3.0 A (NCV891334). At low output
currents (≤ 50 mA), the device will operate in LDO mode,
switching to PWM mode as current increases beyond
50 mA. The device is equipped with SYNCI and SYNCO
pins to synchronize to an external clock and/or another
NCV891x34. A reset (with fixed delay) and a fault pin
(flagging low input voltage and high temperature warnings)
simplify interfacing with a microcontroller.

Features and Benefits

•
40 mA Iq in Light Load Condition
•
2.0 A Maximum Output Current in PWM Mode in
NCV891234
•
3.0 A Maximum Output Current in PWM Mode in
NCV891334
•
Internal N−channel Power Switch
•
V
Operating Range 3.7 V to 36 V, Withstands Load
IN
Dump to 45 V
•
Logic Level Enable Pin can be Tied to Battery
© Semiconductor Components Industries, LLC, 2016
November, 2016 − Rev. 0
Top Side
Figure 1. Evaluation Board Photo
EVAL BOARD USER'S MANUAL
This document will help the user to set up the hardware
and to make demonstration kit running. All evaluation kit
components will
be
connections, jumper's configuration). A quick test
procedure will be also described to guide the user.
Bottom Side
•
Fixed Output Voltage of 5.0 V or 3.3 V with ±2%
Accuracy
•
2 MHz Free−running Switching Frequency
•
Input and Output Synchronization Pins
•
Safety – Vision Systems
•
Audio, Infotainment
•
Instrumentation
•
Telematics
1
www.onsemi.com
described
(evaluation
Publication Order Number:
EVBUM2492/D
board,

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Summary of Contents for ON Semiconductor NCV891234

  • Page 1 EVAL BOARD USER’S MANUAL fixed to either 3.3 V or 5.0 V, capable of delivering 2.0 A (NCV891234) or 3.0 A (NCV891334). At low output currents (≤ 50 mA), the device will operate in LDO mode, switching to PWM mode as current increases beyond 50 mA.

  • Page 2: Block Diagram

    NCV891234, NCV891334 BLOCK DIAGRAM CDRV DBST VOUT VIN 2 CBST 3.3 V COUT Oscillator LOGIC Enable Sync Sync VOUT SYNCO SYNCO − comp 2A, 3A detector Soft−Start SYNCI SYNCI RESET VOLTAGES MONITORS RSTB RESET Switcher Supply LINEAR REGULATOR OVLD MODE...
  • Page 3 NCV891234, NCV891334 Table 1. EVALUATION BOARD TERMINALS Pin Number Pin Name Function VBAT Input voltage from battery. Place an input filter capacitor in close proximity to this pin. SYNCO Out−of−phase synchronization output. Turn−on of the Power Switch causes the SYNCO signal to fall (and rise half a switching period later).
  • Page 4 NCV891234, NCV891334 Quick−Start Guide pulsed waveform with amplitude approximately The following steps will get you familiar with the setup of between VBAT and GND (PWM mode). inputs and outputs of the NCV891x34. 7. While at load, increase VBAT to 21 V.
  • Page 5 NCV891234, NCV891334 EMI Filter 1.0 mH In a typical application, an LC filter is used on the input 4.7 mF CVIN0: line of a buck regulator to filter EMI from the device. On this CB1: 100 mF evaluation board, an LC filter is pre−populated to allow you An input filter can drastically reduce the emissions from to perform EMI testing directly with this evaluation board.
  • Page 6 NCV891234, NCV891334 SCHEMATIC Figure 7. NCV891x34MWxxGEVB Evaluation Board Schematic − Rev.1 www.onsemi.com...
  • Page 7 NCV891234, NCV891334 PCB LAYOUT Figure 8. NCV891334MW50GEVB PCB Layout − Top Figure 9. NCV891334MW50GEVB PCB Layout − Bottom All evaluation board PCB layouts are identical with the exception of TOP Silkscreen and device mounted upon them. www.onsemi.com...

  • Page 8: Bill Of Materials

    FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized...

This manual is also suitable for:

Ncv891334

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