on NCP370GEVB User Manual

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.

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EVAL BOARD USER’S MANUAL

© Semiconductor Components Industries, LLC, 2011

August, 2011 − Rev. 3

Figure 1. NCP370GEVB Board Picture

1 Publication Order Number:

EVBUM2015/D

NCP370GEVB

Figure 2. NCP370GEVB Board Schematic

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NCP370GEVB

Table 1. BILL OF MATERIALS

Quantity Designation Manufacturer Digi key Specifications

1 NCP370 LLGA3x3 ON Semiconductor Over voltage protection

2 C1 (Cin), C2 (Cout) Murata –

1 C3 (ID): not mounted

13 Test points:IN1, OUT1, BAT-

1 J13 (USB IN) Molex WM17116CT-ND 5 pins USB miniB

1 J12. (USB OUT) Molex WM17118-ND 4 pins USB A

1 FLAG rohm 511-1287-ND Green LED 0805

1 R6 susumu Rr08p(value)dct-nd

2 R3, R4 susumu Rr08p(value)dct-nd

Not

mounted

1 R1 susumu Rr08p(value)bct-nd

1 R2 susumu Rr08p(value)bct-nd

4 GND jumper: J7, J10 WM8083-ND Jumper Ground 1mm pitch

1x3 REV WM8083-ND SMB R 114 665

1x3 DIR WM8083-ND SMB R 114 665

1x2 Imax WM8083-ND SMB R 114 665

1x2 I2 WM8083-ND SMB R 114 665

1x2 Battery WM8083-ND SMB R 114 665

TERY, FLAG, DRAIN, REV, DIR

R5,R7,R8,R9 (USB data)

GRM188R61E105KA12D

490-3897-1-ND

5001K-ND Hole diameter: 1.3mm

1 mF 25V X5R CMS0805

1 kW. CMS0603 0.5%

100 kW. CMS0603 0.5%

69.8k W. CMS0603 0.5%

16.9k W. CMS0603 0.5%

10.16 mm

PCB Plated Gold

PCB Plated Gold

PCB Plated Gold

PCB Plated Gold

PCB Plated Gold

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NCP370GEVB

PCB

Figure 3. NCP370GEVB Board Layout (Top View)

Figure 4. NCP370GEVB Board Layout (Bottom View)

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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).

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4. Connect strap on lim.

NCP370GEVB

ILIM PIN (7)

SW1 (IMAX)

SW2 (2)

R2 = 14kR1 = 70k

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NCP370GEVB

5. Select I limit threshold with pull down resistors connected on pin 7:

SW1 SW2 IOCP

0 0 500 mA

0 1 1 A

1 0 1.5 A

1 1 1.5 A

R1 = 70K
R2 = 14K

Disable Mode:

6. Connect 10 V capability Vin Supply on IN1 test point.
a.) Set power supply to 5 V ⇒ Check Vout = 0 V and LED = off

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NCP370GEVB

Direct Mode:

7. Switch /DIR from left to right, 1 logic level to 0 logic level

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. Check Flag LED = off, and Vout = Vin = 7 V.

Disconnect Vin Supply.

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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.

NCP370GEVB

Put strap to connect Battery to Vout

14. Set /DIR = 1, /REV = 0: Vout = Vin

If I accessory < I limit then Vin = Vout − Rdson x I

If I accessory > I limit then Vin = 0 (Current regulation)

Power off.

15. Set /DIR = 1, /REV = 1

16. Disconnect accessory

17. Disconnect Battery

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
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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
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