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on NCP370GEVB User Manual

Over voltage protection controller with reverse charge control evaluation board
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NCP370GEVB
NCP370 Over Voltage
Protection Controller with
Reverse Charge Control
Evaluation Board User's
Manual
Description
The NCP370 is an overvoltage, overcurrent and reverse control
device. Two main modes are available by setting logic pins.
First mode is Direct Mode from Wall Adapter to the system. In this
mode the system is both positive and negative overvoltage protected
up to +28 V and down to −28 V. The wall adapter is disconnected from
the system if the input voltage exceeds the overvoltage (OVLO) or
undervoltage (UVLO) thresholds. At powerup, the Vout turns on
30 ms after the Vin exceeds the undervoltage threshold.
The second mode, called the Reverse Mode, allows an external
accessory to be powered by the system battery or a boost converter.
Here, the external accessory would be connected to the device input
(bottom connector of system) and the device battery would be at the
device output. In this case, overcurrent protection is activated to
prevent accessory faults and battery discharge. Thanks to the NCP370
using an internal NMOS, the system cost and the PCB area of the
application board are minimized. The NCP370 provides a negative
going flag (FLAG(BAR)) output which alerts the system that a fault
has occurred. In addition, the device has ESD protected input (15 kV
Air) when bypassed with a 1.0 mF or larger capacitor.
© Semiconductor Components Industries, LLC, 2011
August, 2011 − Rev. 3
Figure 1. NCP370GEVB Board Picture
1
http://onsemi.com
EVAL BOARD USER'S MANUAL
Publication Order Number:
EVBUM2015/D

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Summary of Contents for on NCP370GEVB

  • Page 1 +28 V and down to −28 V. The wall adapter is disconnected from the system if the input voltage exceeds the overvoltage (OVLO) or undervoltage (UVLO) thresholds. At powerup, the Vout turns on 30 ms after the Vin exceeds the undervoltage threshold.
  • Page 2 NCP370GEVB Figure 2. NCP370GEVB Board Schematic http://onsemi.com...
  • Page 3 NCP370GEVB Table 1. BILL OF MATERIALS Quantity Designation Manufacturer Digi key Specifications NCP370 LLGA3x3 ON Semiconductor Over voltage protection C1 (Cin), C2 (Cout) Murata – 490-3897-1-ND 1 mF 25V X5R CMS0805 GRM188R61E105KA12D C3 (ID): not mounted Test points:IN1, OUT1, BAT- 5001K-ND Hole diameter: 1.3mm...
  • Page 4 NCP370GEVB Figure 3. NCP370GEVB Board Layout (Top View) Figure 4. NCP370GEVB Board Layout (Bottom View) http://onsemi.com...

  • Page 5: Connecting Process

    NCP370GEVB CONNECTING PROCESS 1. Place /REV strap and /DIR strap on left side (“1” logic) (connected to Vbat, through pull up resistor) 2. Let Battery strap opened. 3. Connect a Battery or power supply (4.2 V) on Battery test point (min 2 A capability).
  • Page 6 NCP370GEVB 4. Connect strap on lim. ILIM PIN (7) SW2 (2) SW1 (IMAX) R1 = 70k R2 = 14k http://onsemi.com...
  • Page 7 NCP370GEVB 5. Select I limit threshold with pull down resistors connected on pin 7: IOCP 500 mA 1.5 A 1.5 A R1 = 70K R2 = 14K Disable Mode: 6. Connect 10 V capability Vin Supply on IN1 test point.

  • Page 8: Direct Mode

    8. Check Vout = 5 V and Flag LED is still off 9. Set Vin = 7 V 10. Check Flag LED = on, and Vout is 0 V. 11. Switch /REV from left to right, 1 logic level to 0 logic level 12.

  • Page 9: Reverse Mode

    13. Connect Set /DIR = 1, /REV = 1 Disconnect Vin Power Supply from IN test points. Connect accessory on IN1 or IN2 test points. Put strap to connect Battery to Vout 14. Set /DIR = 1, /REV = 0: Vout = Vin If I accessory <...

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