ON Semiconductor NCP1397A, NCP1397B Technical data

NCP1397A, NCP1397B

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High Performance Resonant Mode Controller with Integrated High--Voltage Drivers

The NCP1397 is a high performance controller that can be utilized in half bridge resonant topologies such as series resonant, parallel resonant and LLC resonant converters. It integrates 600 V gate drivers, simplifying layout and reducing external component count. With its unique architecture, including a 500 kHz Voltage Controlled Oscillator whose control mode permits flexibility when an ORing function is required, the NCP1397 delivers everything needed to build a reliable and rugged resonant mode power supply.

The NCP1397 provides a suite of protection features with configurable settings to optimize any application. These include: auto--recovery or fault latch--off, brown--out, open optocoupler, soft--start and short--circuit protection. Deadtime is also adjustable to overcome shoot through current.

Features

 High--Frequency Operation from 50 kHz up to 500 kHz  600 V High--Voltage Floating Driver  Adjustable Minimum Switching Frequency with ±3% Accuracy  Adjustable Deadtime from 100 ns to 2 ms.  Startup Sequence Via an Externally Adjustable Soft--Start  Brown--Out Protection for a Simpler PFC Association  Latched Input for Severe Fault Conditions, e.g. Over Temperature or

OVP

 Timer--Based Input with Auto--Recovery Operation for Delayed

Event Reaction

 Latched Overcurrent Protection  Disable Input for Immediate Event Reaction or Simple ON/OFF

Control

 V  Low Startup Current of 300 mA  1 A / 0.5 A Peak Current Sink / Source Drive Capability  Common Collector Optocoupler Connection for Easier ORing  Optional Common Emitter Optocoupler Connection  Internal Temperature Shutdown  These Devices are Pb--Free, Halogen Free/BFR Free and are RoHS

Operationupto20V

Compliant

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MARKING

DIAGRAMS

SO--16, LESS PIN 13

Skip/Disable

See detailed ordering and shipping information in the package dimensions section on page 26 of this data sheet.

D SUFFIX

CASE 751AM

x=AorB A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week G = Pb--Free Package

PIN CONNECTIONS

CSS(dis)

Ctimer

Fmax

ORDERING INFORMATION

(Top View)

NCP1397xG

AWLYWW

Vboot

Mupper

Mlower

GND

Fault

Typical Applications

 Flat Panel Display Power Converters  High Power ac--dc Adapters for Notebooks  Computing Power Supplies

 Semiconductor Components Industries, LLC, 2010

November, 2010 -- Rev. 2

 Industrial and Medical Power Sources  Offline Battery Chargers

1 Publication Order Number:

NCP1397/D

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R18

NCP1397A, NCP1397B

Figure 1. Typical Application Example

PIN FUNCTION DESCRIPTION

Pin # Pin Name Function Pin Description

1 CSS(dis) Soft--Start Discharge Soft--start capacitor discharge pin. Connect to the soft--start capacitor to reset it

2 Fmax Maximum frequency clamp A resistor sets the maximum frequency excursion

3 Ctimer Timer duration Sets the timer duration in presence of a fault

4 Rt Minimum frequency c lamp Connecting a resistor to this pin, sets the minimum oscillator frequency reached

5 BO Brown--Out Detects low input voltage conditions. When brought above V

6 FB Feedback Injecting current into this pin increases the oscillation frequency up to Fmax.

7 DT Deadtime A simple resistor adjusts the dead-- time width

8 Skip/Disable Skip or Disable input Upon release, a clean startup sequence occurs if VFB< 0.3 V. During the skip

9 Fault Fault detection input When asserted, the external timer starts to countdown and shuts down the

10 GND Analog ground --

11 Mlower Low side output Drives the lower side MOSFET

12 V

13 NC Not c onnected Increases the creepage distance

14 HB Half--bridge connection Connects to the half--bridge output

15 Mupper High side output Drives the higher side MOSFET

16 Vboot Bootstrap pin ThefloatingVCCsupply for the upper stage

Supplies the controller Thecontrolleracceptsupto20V

before startup or during overload conditions.

=1V.

for V

(4 V typically), it

fully latches off the controller.

mode, when FB doesn’t drop below 0.3 V, the IC restarts without soft--start sequence.

controller at the end of its time duration. Simultaneously the Soft--Start discharge switch is activated so the converter operating frequency goes up to protect application power stage. This input features also second fault comparator with higher threshold (1.5 V typically) that: A) Speeds up the timer capacitor charging current 8 times – NCP1397A B) latches off the IC permanently – NCP1397B In both versions the second fault comparator helps to protect application in case of short circuit on the output or transformer secondary winding.

latch

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NCP1397A, NCP1397B

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VDD

Imin VFB  VFB(off)

Vref

I = Imax for Vfb = 5.3 V I = 0 for Vfb < Vfb(min)

Fmax

Time r

VDD

Vref

Itimer1

IDT

VDD

Imax VFB = 5

Vdd

Itimer2

Temperature

Shutdown

DT Adj.

Vref

Timeout Fault

Clk

50% DC

PON Reset

Fault

Timeout Fault

Vref

Management

VCC

BO Reset

Fast Fault

Level

Shifter

UVLO

BOOT

Mupper

SS(dis)

RFB

IBO

VFB(fault)

VDD

IDT

VBO

PON Reset Fault

G=1

VFB(min)

20 msNoise Filter

Vlatch

> 0 only V=V(FB)-- VFB(min)

Vref

20 msNoise Filter

VDD

Deadtime

Adjustment

Fault

Mlower

GND

Filter

Skip/ Disable

Vref Skip/Disable

PON Reset

20 ns Noise

Fault

Vref(fault)

Vref( OCP )

1 msNoise Filter

Figure 2. Internal Circuit Architecture (NCP1397A)

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NCP1397A, NCP1397B

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VDD

Imin

Itimer1

Vref

VFB  VFB(off)

IDT

VDD

Imax Vfb = 5

I = Imax for Vfb = 5.3 V I = 0 for Vfb < Vfb_min

Fmax

Time r

Vref

VDD

Vref

If FAULT Itimer else 0

DT Adj.

Time out Fault

Temperature

Shutdown

PON Reset

Fault

Timeout Fault

Vref

Management

VCC

BO Reset

Fast Fault

Level

Shifter

UVLO

Clk

50% DC

BOOT

Mupper

SS(dis)

Fault

RFB

IBO

VFB(fault)

VDD

Vref(fault)

IDT

VBO

Vref( OCP )

PON Reset Fault

Fault

G=1

VFB(min)

20 msNoise Filter

Vlatch

> 0 only V=V(FB)-- VFB(min)

Vref

20 msNoise Filter

1 msNoise Filter

VDD

Deadtime

Adjustment

Figure 3. Internal CircuitArchitecture (NCP1397B)

Mlower

GND

Filter

Skip/ Disable

Vref Skip

PON Reset

20 ns Noise

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NCP1397A, NCP1397B

MAXIMUM RATINGS

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Rating Symbol Valu e Unit

High Voltage bridge pin, pin 14 V

Floating supply voltage, ground referenced V

High side output voltage V

Low side output voltage V

Allowable output slew rate dV

Power Supply voltage, pin 12 V

BOOT

BRIDGE

-- V

BRIDGE

DRV(HI)

DRV(LO)

/dt 50 V/ns

BRIDGE

Maximum voltage, all pins (except pin 11 and 10) -- --0.3to10 V

Thermal Resistance Junction--to--Air, PDIP version

Thermal Resistance Junction--to--Air, SOIC version

Storage Temperature Range -- -- 60 to +150 C

ESD Capability, Human Body Model (HBM) (All pins except HV pins) -- 2 kV

ESD Capability, Machine Model (MM) -- 200 V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

1. This device(s) contains ESD protection and exceeds the following tests:

Human Body Model 2000 V per JEDEC Standard JESD22--A114E Machine Model 200 V per JEDEC Standard JESD22--A115--A

2. This device meets latchup tests defined by JEDEC Standard JESD78.

--1to600 V

0to20 V

BRIDGE

BOOT

-- 0 . 3 t o +0.3

--0.3toVCC+0.3 V

20 V

100 C/W

130 C/W

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NCP1397A, NCP1397B

ELECTRICAL CHARACTERISTICS (For typical values T

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= 12 V unless otherwise noted)

Symbol

Rating Pin Min Typ Max Unit

=25C, for min/max values TJ=--40C to +125C, Max TJ= 150C, V

SUPPLY SECTION

CC(on)

CC(min)

boot(on)

boot(min)

startup

CC(reset)VCC

CC1

CC2

CC3

Turn-- on threshold level, VCCgoing up 12 9.7 10.5 11.3 V

Minimum operating voltage after turn--on 12 8.7 9.5 10.3 V

Startup voltage on the floating section 16--14 8 9 10 V

Cutoff voltage on the floating section 16--14 7.4 8.4 9.4 V

Startup current, VCC<V

CC(on)

12 -- -- 300

level at which the internal logic gets reset 12 -- 6.6 -- V

Internal IC consumption, no output load on pin 15/14 – 11/10,

= 300 kHz

Internal IC consumption, 1 nF output load on pin 15/14 – 11/10,

= 300 kHz

Consumption in fault or disable mode (All drivers disabled, Rt = 34 kΩ,R

=10kΩ)

12 -- 4 -- mA

12 -- 11 -- mA

12 -- 1.5 -- mA

VOLTAGE CONTROL OSCILLATOR (VCO)

SW(min)

SW(max)

Minimum switching frequency, Rt = 34 kΩ on pin 4, V DT = 300 ns

Maximum switching frequency, R

5.3V,Rt=34kΩ, DT = 300 ns

Feedback pin swing above which Δf=0

f(max)

pin6

=1.9kΩ on pin 2, V

=0.8V,

pin6

4 58.2 60 61.8 kHz

2 440 500 560 kHz

6 -- 5.3 -- V

DC Operating duty--cycle symmetry 11 --1 5 48 50 52 %

ref(Rt)

del1

del2

Delay before driver restart from fault or disable mode -- -- 700 -- ns

Delay before driver restart after V

event (Note 4) -- -- 11 --

CC(on)

Reference voltage for Rt pin 4 2.18 2.3 2.42 V

FEEDBACK SECTION

FB(min)

FB(off)

FBoff(hyste)

Internal pulldown resistor 6 -- 20 --

kΩ

Voltage on pin 6 below which the FB level has no VCO action 6 -- 1.1 -- V

Voltage on pin 6 below which the controller considers the FB fault 6 240 280 320 mV

Feedback fault comparator hysteresis 6 -- 45 -- mV

DRIVE OUTPUT

dead

dead(max)

dead(min)

HV(LEAK)

Output voltage risetime @ CL= 1 nF, 10--90% of output signal 15-- 14/11-- 10 -- 40 -- ns

Output voltage falltime @ CL= 1 nF, 10--90% of output signal 15--14/11--10 -- 20 -- ns

Source resistance 15--14/11-- 10 -- 13 --

Sink resistance 15--14/11-- 10 -- 5.5 --

Deadtime with RDT=10kΩ frompin7toGND

Maximum deadtime with RDT=82kΩ frompin7toGND

Minimum deadtime, RDT=3kΩ frompin7toGND

7 250 290 340 ns

7 -- 2 --

7 -- 100 -- ns

Leakage current on high voltage pins to GND 14, 15,16 -- -- 5

TIMERS

timer1

Timer capacitor charge current during feedback fault or when V

ref(fault)<Vpin9<Vref(OCP)

3 150 175 190

3. The IC does not activate soft--start (unless the feedback pin voltage is below 0.3 V) when the skip/disable input is released, this is for skip cycle implementation.

4. Guaranteed by design.

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NCP1397A, NCP1397B

ELECTRICAL CHARACTERISTICS (For typical values T

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= 12 V unless otherwise noted)

=25C, for min/max values TJ=--40C to +125C, Max TJ= 150C, V

Symbol UnitMaxTypMinPinRating

TIMERS

timer2

timer

timerR

timer(on)

timer(off)

SS(dis)

Timer capacitor charge current when V

) – A version only

charge2

pin9>Vref(OCP)(Icharge1

Timer duration with a 1 mF capacitor anda1MΩ resistor, I current applied

timer1

3 1.1 1.3 1.5 mA

3 -- 24 -- ms

Timer recurrence in permanent fault, same values as above 3 -- 1.4 -- s

Voltage at which pin 3 stops output pulses 3 3.8 4 4.2 V

Voltage at which pin 3 restarts output pulses 3 0.95 1 1.05 V

Soft--start discharge switch channel resistance 1 -- 100 --

PROTECTION

ref(Skip)

Hyste

ref(Fault)

Hyste

ref(OCP)

Hyste

p(Disable)

IBO

(bias)

Reference voltage for Skip/Disable input (Note 4) 8 630 660 690 mV

Hysteresis for Skip/Disable (Note 4) 8 -- 45 -- mV

(Skip)

Reference voltage for Fault comparator 9 0.99 1.04 1.09 V

Hysteresis for fault comparator input 9 -- 60 -- mV

(Fault)

Reference voltage for OCP comparator 9 1.47 1.55 1.63 V

Hysteresis for OCP comparator input 9 -- 90 -- mV

(OCP)

Propagation delay from disable input to the drive shutdown 8 -- 60 100 ns

Brown--Out input bias current 5 -- 0.02 --

VBO Brown--Out level 5 0.99 1.04 1.09 V

IBO Hysteresis current, V

atch

SD(hyste)

Latching voltage 5 3.7 4 4.3 V

Temperature shutdown -- 140 -- -- C

Hysteresis -- -- 30 -- C

> VBO 5 25 28 31

pin5

3. The IC does not activate soft--start (unless the feedback pin voltage is below 0.3 V) when the skip/disable input is released, this is for skip cycle implementation.

4. Guaranteed by design.

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NCP1397A, NCP1397B

)

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10.55

10.50

(V)

10.45

CC(on)

10.40

10.35

--40 --25 --10 5 20 35 50 65 80 95 110 125

TEMPERATURE (C)

Figure 4. V

60.05

59.95

(kHz)

59.9

SW(min)

59.85

59.8

CC(on)

TYPICAL CHARACTERISTICS

9.52

9.50

9.48

(V)

9.46

9.44

CC(min)

9.42

9.40

9.38

Threshold

510

509

508

507

(kHz)

506

SW(max)

505

504

--40 --25 --10 5 20 35 50 65 80 95 110 125

TEMPERATURE (C)

Figure 5. V

CC(min)

Threshold

59.75

--40 --20 0 20 40 60 80 100 120 TEMPERATURE (C)

Figure 6. F

23.0

22.5

22.0

21.5

21.0

(kΩ)

20.5

20.0

19.5

19.0

18.5

--40 --25 --10 5 20 35 50 65 80 95 110 125

SW(min)

TEMPERATURE (C)

Frequency Clamp

Figure 8. Pulldown Resistor (RFB)

503

--40 --25 --10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)

Figure 7. F

0.661

0.660

0.659

(V)

0.658

ref(skip)

0.657

0.656

0.655

--40 --25 --10 5 20 35 50 65 80 95 110 12

SW(max)

TEMPERATURE (C)

Frequency Clamp

Figure 9. Skip/Disable Threshold (V

ref(ski

)

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17.0

16.0

15.0

14.0

13.0

12.0

ROHA (Ω)

11. 0

10.0

9.0

8.0

--40 --25 --10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)

TYPICAL CHARACTERISTICS

Figure 10. Source Resistance (ROH)

114

113

112

111

110

(ns)

109

108

dead(min)

107

106

105

104

--40 --25 --10 5 20 35 50 65 80 95 110 125

TEMPERATURE (C)

Figure 12. T

dead(min)

9.0

8.5

8.0

7.5

7.0

6.5

6.0

ROLA (Ω)

5.5

5.0

4.5

4.0

--40 --25 --10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)

Figure 11. Sink Resistance (ROL)

297

296

295

294

293

(ns)

292

291

dead(nom)

290

289

288

287

286

--40 --25 --10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)

Figure 13. T

dead(nom)

2.065

2.060

2.055

(ms)

2.050

dead(max)

2.045

2.040

2.035

--40 --25 --10 5 20 35 50 65 80 95 110 125

TEMPERATURE (C)

Figure 14. T

dead(max)

4.035

4.030

4.025

(V)

4.020

latch

4.015

4.010

4.005

--40 --25 --10 5 20 35 50 65 80 95 110 125

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TEMPERATURE (C)

Figure 15. Latch Level (V

latch

)

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