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NCP1398CDR2G

High Performance Resonant Mode Controller with Integrated High-Voltage Drivers

ON Semiconductor 

NCP1398B/C

HV

Rupper

FB

OVP

R1

R2

R7

D5

OK1

OK2

Rdis

Rocp Rss

Cocp Css

Ct

Rt

CBO

D1

R3

U5

1

16

C1

BO

Vboot

2

Ctimer

15

HB

3

14

Discharge Mupper

4

Fmax

5

Rt

6

DT

7

FB

12

VCC

11

GND

10

Mlower

8

9

Skip/disable OLP

R5

OCP Input

R4

R6

D3

+

D2

C2

C3

RDT

C4

R8

M1 +

C5

Ls

D6

M2

C6 T1 D7

Vout

R10

+

C7

R11

FB

R12

R1

OVP

OK1 C8 OK2

D4

R9

Cs

U1

D8

R13 C9

R2

Rfmax

Rfmin Rfb Rskip_out Rlower

Figure 1. Typical Application Example

PIN FUNCTION DESCRIPTION

Pin N5 Pin Name

Function

1

BO

Brown−Out

2

Ctimer

Fault timer duration

3

Discharge

Overload protection

4

Fmax

Maximum frequency clamp

5

Rt

Minimum frequency clamp

6

DT

7

FB

Dead−time adjust

Feedback

8

Skip/Disable

Skip or Disable input

9

OLP

Overload protection detection

input

10

Mlower

11

GND

12

VCC

13

NC

15

Mupper

14

HB

16

Vboot

Low side output

IC ground

Supplies the controller

Not connected

High side output

Half−bridge connection

Bootstrap pin

Pin Description

Detects low input voltage conditions. When brought above Vlatch (4V),

fully latches off the controller.

Sets the fault timer and auto−recovery durations

Implements frequency shift in case of overload.

A resistor connected between this pin and GND sets the maximum fre-

quency excursion. Controller enters skip mode and disables drivers if

the operating frequency exceeds this adjusted value.

Connecting a resistor to this pin, sets the minimum oscillator frequency

reached for VFB = 1.1 V. Discharge OCP and Soft Start networks before

startup or reset.

A simple resistor adjusts the dead−time

Voltage on this pin modulates operating frequency between adjusted

Fmin and Fmax clamps. Starts Fault timer when FB voltage stays below

0.28 V − function not active on NCP1398C version.

Defines frequency and thus also FB voltage under which the controller

returns from skip mode. Upon release, a clean startup sequence occurs

if VFB < 0.28 V. During the skip mode, when FB doesn’t drop below

0.28 V, the IC restarts without soft start sequence.

Initiates fault timer when asserted. Increases operating frequency via

discharge pin to protect application power stage. This input features

also latch fault comparator that latches off the IC permanently.

Drives the lower side MOSFET

−

The controller accepts up to 20 V

Increases the creepage distance

Drives the higher side MOSFET

Connects to the half−bridge output

The floating VCC supply for the upper stage

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