NCP5162DR2 datasheet(6/15 Pages) ONSEMI

Part #	NCP5162DR2

Description	General Purpose Transistors

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Manufacturer	ONSEMI [ON Semiconductor]

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NCP5162

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6

+

−

+

−

+

VCC1

SS

VFFB Low

Comparator

VFFB

Fast Feedback

LGND

Slow Feedback

PWM

Comparator

SS Low

Comparator

SS High

Comparator

VCC1 Monitor

Comparator

Error

Amplifier

VCC1

VCC2

COFF

VGATE(H)

VGATE(L)

PGND

FAULT

Latch

PGND

R

S

Q

R

S

Q

R

S

Q

Latch

PMW

COFF

One Shot

Off−Time

Timeout

Time−Out

Timer

Edge Triggered

Extended

Off−Time

Timeout

Normal

Off−Time

Timeout

Maximum

On−Time

Timeout

(30 μs)

GATE(H) = ON

GATE(H) = OFF

2.0 μA

60 μA

5.0 V

0.7 V

2.5 V

REF

−

+

−

+

−

9.05 V

8.90V

VFB

COMP

Figure 2. Block Diagram

REF

Disable

1.0 V

Reference

REF

VCC1

APPLICATIONS INFORMATION

THEORY OF OPERATION

V2 Control Method

The V2 method of control uses a ramp signal that is

generated by the ESR of the output capacitors. This ramp is

proportional to the AC current through the main inductor

and is offset by the value of the DC output voltage. This

control scheme inherently compensates for variation in

either line or load conditions, since the ramp signal is

generated from the output voltage itself. This control

scheme differs from traditional techniques such as voltage

mode, which generates an artificial ramp, and current mode,

which generates a ramp from inductor current.

Figure 3. V2 Control Diagram

COMP

VFFB

Reference

Voltage

+

PWM

Comparator

Ramp

Signal

Error

Amplifier

Error

Signal

Output

Voltage

Feedback

VFB

VGATE(H)

VGATE(L)

E

C

−

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NCP5162DR2 Datasheet(PDF) 6 Page - ON Semiconductor

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