On Ncp370gevb User manual

©Semiconductor Components Industries, LLC, 2011

August, 2011 −Rev. 3

1Publication Order Number:

EVBUM2015/D

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.

Figure 1. NCP370GEVB Board Picture

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EVAL BOARD USER’S MANUAL

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Figure 2. NCP370GEVB Board Schematic

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Table 1. BILL OF MATERIALS

Quantity Designation Manufacturer Digi key Specifications

1NCP370 LLGA3x3 ON Semiconductor Over voltage protection

2C1 (Cin), C2 (Cout) Murata –

GRM188R61E105KA12D

490-3897-1-ND 1 mF 25V X5R CMS0805

1C3 (ID): not mounted

13 Test points:IN1, OUT1, BAT-

TERY, FLAG, DRAIN, REV, DIR

5001K-ND Hole diameter: 1.3mm

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

1J12. (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 1 kW. CMS0603 0.5%

2R3, R4 susumu Rr08p(value)dct-nd 100 kW. CMS0603 0.5%

Not

mounted

R5,R7,R8,R9 (USB data)

1 R1 susumu Rr08p(value)bct-nd 69.8k W. CMS0603 0.5%

1 R2 susumu Rr08p(value)bct-nd 16.9k W. CMS0603 0.5%

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

10.16 mm

1x3 REV WM8083-ND SMB R 114 665

PCB Plated Gold

1x3 DIR WM8083-ND SMB R 114 665

PCB Plated Gold

1x2 Imax WM8083-ND SMB R 114 665

PCB Plated Gold

1x2 I2 WM8083-ND SMB R 114 665

PCB Plated Gold

1x2 Battery WM8083-ND SMB R 114 665

PCB Plated Gold

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PCB

Figure 3. NCP370GEVB Board Layout (Top View)

Figure 4. NCP370GEVB Board Layout (Bottom View)

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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.

ILIM PIN (7)

SW2 (2)

R2 = 14kR1 = 70k

SW1 (IMAX)

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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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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.

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

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