ON Semiconductor NCL35076 User manual

CCM Buck Controller for

l

Precise Current Regulation and Wide Analog Dimming

NCL35076

The NCL35076 is a DC−DC buck controller for wide dimming range down to 1% by analog dimming control to relieve audible noise and flicker in PWM dimming. ON Semiconductor’s proprietary LED current calculation technique driven by zero input offset amplifiers performs precise constant current in the whole analog dimming range. Multi−mode operation provides low LED current ripple with small output capacitor by CCM at heavy load and deep analog dimming by DCM at light load.

PWM dimming is also provided in case that constant LED color temperature is required. NCL35076 ensures high system reliability with LED short protection, over current protection and thermal shutdown.

Features

• Wide Analog Dimming Range: 1~100%

• Low CC Tolerance: ±2% at 100% Load & ±20% at 1% Load

• Low System BOM

• LED Off Mode at Standby

• Low Standby Current

• PWM Dimming Available

• Gate Sourcing and Sinking Current of 0.5 A/0.8 A

• Robust Protection Features

♦ LED Short Protection ♦ Over Current Protection ♦ Thermal Shutdown ♦ V

Over Voltage Protection

DD

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1

SOIC−8 NB

CASE 751

MARKING DIAGRAM

L35076AA

AWLYYWW

L30076 = Specific Device Code AA = Default Trimming Option A = Assembly Location WL = Wafer Lot Traceability Code YYWW = 4 Digit Data Code

PIN ASSIGNMENT

PGBIAS

Typical Applications

• LED Lighting System

April, 2021 − Rev. 2

DRVCSZCD VDDSG

DIMFB

(Top View)

ORDERING INFORMATION

Device Package Shipping

NCL35076AADR2G SOIC−8 NB 3000 /

Tape & Ree

†For information on tape and reel specifications,

including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.

1 Publication Order Number:

NCL35076/D

NCL35076

APPLICATION SCHEMATIC

30~200 Vin

V

AC

Dimming

Signal

PFC

Flyback

FB

DIM

DRV

CSZCD

NCL35076

SG

PG

BIAS

VDD

External source

Figure 1. Application Schematic

BLOCK DIAGRAM

RCS

VDD

BIAS

FB

DIM

V

CSZCD

10 V /

3.3 V

8 V

LDO

V

FB

Toff generator

OTA

Reference control PWM dimming control

Standby mode control

V

DD

Over voltage protection

LED short protection

Over current protection

T

J

Thermal Shutdown

Soft start

V

LED

REF

V

DD−ON

V

TO FF.SS

V

TO FF.FB

+ 30 mV

V

PDIM

V

SHUTDOWN

V

CS.LIM

V

PDIM

V

ON

V

OFF

Protection

AR control

|| V

SHUTDOWN

V

PWM

Q

S R

Precise LED

current calculator

V

SHUTDOWN

V

DRV

CS.LIM

CSZCD

PG

SG

Figure 2. Simplified Block Diagram

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NCL35076

PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Function

Description

1

BIAS

3.3 V BIAS

This pin is 3.3 V LDO output to bias the internal digital circuit

2

CSZCD

CS and ZCD Sensing

This pin detects the switch current and the inductor current zero cross time

3SGSignal Ground

Signal Ground is close to control pin circuit such as CSZCD, DIM and FB

4FBFeedback

Output of feedback OTA

5

DIM

Dimming Input

Dimming signal is provided to this pin

6

VDD

Power Supply

IC operating current is supplied to this pin

7

DRV

Output Drive

This pin is connected to drive external switch

8PGPower Ground

Power Ground is close to the capacitors at BIAS and VDD pin

PIN CONFIGURATION

(Top View)

Figure 3. Pin Configuration

PGBIAS DRVCSZCD VDDSG DIMFB

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NCL35076

MAXIMUM RATINGS

Parameter

Symbol

Value

Unit

VDD, DRV Pin Voltage Range

V

−0.3 to 30

V

DIM, FB, CSZCD, BIAS Pin Voltage Range

V

−0.3 to 5.5

V

Maximum Power Dissipation (TA < 50°C)

P

550

mW

Maximum Junction Temperature

T

150

C

Storage Temperature Range

T

−55 to 150

C

Junction−to−Ambient Thermal Impedance

R

145

C/W

ESD Capability, Human Body Model (Note 2)

ESD

2

kV

ESD Capability, Charged Device Model (Note 2)

ESD

1

kV

RECOMMENDED OPERATING RANGES

Parameter

Symbol

Min

Max

Unit

Junction Temperature

TJ−40

125

C

ELECTRICAL CHARACTERISTICS (V

= 15 V and TJ = −40~125°C unless otherwise specified)

Parameter

Test Conditions

Symbol

Min

Typ

Max

Unit

VDD SECTION

IC Turn−On Threshold Voltage

V

9.3

10.0

10.7

V

IC Turn−Off Threshold Voltage

V

7.4

8.0

8.6

V

Startup Current

VDD = V

− 1.6 V

I

−

250

400

A

Operating Current

I

−

6.5

8.0

mA

Standby Current

I

−

200

300

A

BIAS SECTION

3.23

3.30

3.37

V

TJ = 25~100°C (Note 4)

3.25

3.30

3.35

V

DIM SECTION

DIM Voltage for 100% V

V

= 2.6 V

V

)

2.44

2.50

2.56

V

DIM Voltage for 99% V

V

)

2.400

2.475

2.528

V

Standby Enabling DIM Voltage

V

5075100

mV

Standby Disabling DIM Voltage

V

60

100

140

mV

Standby Delay Time

t

91011

ms

FB SECTION

FB OTA Source Current

IFB = (V

− V

) x g

x 12.5

I

−14.0

−11.5

−9.0

A

FB OTA Sink Current

IFB = (V

− V

) x g

x 12.5

I

9.0

11.5

14.0

A

SPECIFICATIONS

MV(MAX)

LV(MAX)

D(MAX)

J(max)

STG

θJA

HBM CDM

Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected.

1. Refer to ELECTRICAL CHARACTERISTICS, RECOMMENDED OPERATING RANGES and/or APPLICATION INFORMATION for Safe Operating parameters.

2. This device series incorporates ESD protection and is tested by the following methods:

− ESD Human Body Model per JEDEC Standard JESD22−A114

− ESD Charged Device Model per JEDEC Standard JESD22−C101

− Latch−up Current Maximum Rating ±100 mA per JEDEC Standard JESD78

°

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability.

DD

DD(ON)

DD(OFF)

DD(ON)

BIAS Voltage V

REF

DIM

DIM(REF−MAX DIM(MAX−EFF

DIM(SB−ENA)

DIM(SB−DIS)

SB(DELAY)

DD(ST)

DD(OP)

DD(SB)

BIAS

m

LED

REF

V

= 120 mV, V

REF

V

= 40 mV, V

REF

LED

REF

LED

M(FB)

= 80 mV

M(FB)

= 80 mV

FB(SOURCE)

FB(SINK)

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4

m

NCL35076

E

FB OTA Transconductance

g

= IFB / {(V

− V

) x 12.5}

g

182328

mho

FB OTA High Voltage

V

= 120 mV, V

= 80 mV

V

4.7−−

V

FB Minimum Clamping Voltage

V

= 0 mV, V

= 80 mV

V

0.4

0.5

0.6

V

CS SECTION

CS Regulation

V

)

175

180

185

mV

CS Current Ripple Voltage

V

253035

mV

CS Current Limit Minimum

V

728088

mV

DUTY SECTION

Leading Edge Blanking Time at

t

360

400

440

ns

Maximum Ton Time

t

455055

s

Minimum Toff T ime

VFB = 3.8 V

t

400

850

1000

ns

Maximum Toff Time

VFB = 0.5 V

t

1.17

1.30

1.43

ms

Maximum FB Voltage for Min. Toff

V

)

3.30

3.43

3.55

V

Minimum FB Voltage for Max. Toff

V

)

0.9

1.1

1.3

V

DRV SECTION

DRV Low Voltage

V

−−0.2

V

DRV High Voltage

VDD = 15 V

V

111213

V

DRV Rising Time

C

= 3.3 nF

t

60

100

145

ns

DRV Falling Time

C

= 3.3 nF

t

2555105

ns

AUTO RESTART SECTION

Auto Restart Time at Protection

t

0.9

1.0

1.1

s

VDD OVER VOLTAGE PROTECTION SECTION

VDD Over Voltage Threshold Voltage

V

222324

V

SHORT LED PROTECTION SECTION

SLP Monitoring Triggering Delay

t

)

182022

ms

SLP Monitoring Disable Time at

t

10.8

12.0

13.2

ms

OVER CURRENT PROTECTION SECTION

CS Over Current Protection Thresh-

V

0.4

0.5

0.6

V

THERMAL SHUTDOWN SECTION

Thermal Shut Down Temperature

TSD130

150

170°C

Thermal Shut Down Hysteresis

T

253035°C

LECTRICAL CHARACTERISTICS (V

Parameter UnitMaxTypMinSymbolTest Conditions

FB SECTION

Turn−on

= 15 V and TJ = −40~125°C unless otherwise specified) (continued)

DD

M(FB)

REF REF

DRV DRV

REF

LED

M(FB)

FB(HIGH)

FB(CLP)

CS(REG−MAX

CS(RIPPLE)

CS(LIM−MIN)

LEB(TON)

ON(MAX) OFF(MIN)

OFF(MAX)

FB(MAX−TOFF

FB(MIN−TOFF

DRV(LOW)

DRV(HIGH)

DRV(R) DRV(F)

m

AR(PROT)

DD(OVP)

Time

Startup

old

SLP(MON−DEL

SLP(MON−DIS)

CS(OCP)

(Note 3)

SD(HYS)

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.

3. Guaranteed by design.

4. Guaranteed by characterization.

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