PN8016SSC-R1B datasheet(6/11 Pages) CHIPOWN

6 / 11 page

PN8016

Chipown

www.chipown.com

Rev.1809

Sept.-2018

6 / 11

Functional Description

The PN8016 consists of an integrated Pulse Width

Modulator (PWM) controller and power MOSFET,

specifically designed for small power non-isolated

switching power supply. PN8016 offers fully

intelligentized protections including Over Load

Protection (OLP), Under Voltage Lockout and Over

Temperature

Protection

(OTP).

Excellent

EMI

performance is achieved with Pulse Frequency

Modulation. PN8016 also consists of the high voltage

start-up circuit to ensure that start quickly.

1. Startup

At start up, the internal high-voltage current

source supplies 2.5mA current to charges the external

VDD capacitor. When VDD rises to VDDon, PN8016

starts switching and the internal high-voltage current

source stops charging the capacitor. When VDD drops

to VDDoff ， PN8016 continues switching while the

internal high-voltage current source returns to supplies

2.5mA current to charge the external VDD capacitor.

The internal high-voltage regulator self-supplies the IC,

so extra component is not needed for power supply.

2. CV Operation Mode

In CV operation, PN8016 samples the feedback

signal through VDD pin. While the feedback voltage

remains below VREF, the IC turns on the integrated

MOSFET. When the current of the inductor reaches

the peak current limit (Ipeak), the integrated MOSFET

is turned off. Figure1-1 and Figure 1-2 shows the

operating waveform of key nodes in continuous

conduction

mode

(CCM)

and

discontinuous

conduction mode (DCM). Meanwhile, the IC

integrates load compensation function to improve load

regulation and CV accuracy.

The output voltage of PN8016 can be adjusted by

FB voltage dividing circuit. Use similar equation to

determine the output voltage:

Out

（

In actual applications, FB sampling voltage is

affected by the forward drop of D3 in addition.）

DMOS

DIODE

Iout

Ipeak

Vout

VRF

VREF

Figure 1-1 Waveform if CCM mode

Figure 1-2 Waveform of DCM mode

3. PFM modulation

The IC operates in PFM mode, and Ipeak is set to

decrease with the decrease of the IC operating

frequency (Fsw).when the IC switching cycle increase

1us，Ipeak will decrease 6.0mA.As a result of the

internal current sampling and the maximum current

limit (Ilimit), inductance is the only parameter of the

frequency modulation when output voltage and output

current are fixed.

4. Soft-Start up

In order to regulate peak current in deep CCM

mode, PN8016 build in soft-start function, at the first

10ms of start up, the switching frequency decrease to

25% of the maximum frequency, while 10ms to 15ms

of start up, the switching frequency decrease to 50% of

the maximum frequency. Meanwhile, the leading edge

blanking (LEB) is 300ns (Typ.), in order to regulate

peak current.

5. Smart Protection Control

PN8016

has

several

smart

self-protection

functions, such as Over Load Protection(OLP),Over

Temperature

Protection(OTP),FB

Open

Loop

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