NCV78514

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6

Table 7. DC−DC CONVERTER TABLE (continued)

Symbol

Notes

Unit

Max

Typ

Min

Parameter Description

P_SWITCH_FREQ

DC to DC switching frequency

360

400

440

kHz

P_FSSMB

Spread Spectrum Modulation Bandwidth, of the

SWITCH_FREQ

5

6

10

%

P_FSSMF

Spread Spectrum Modulation Frequency

11.97

13.3

14.65

kHz

P_ILED_MAX

Maximum output current – RSET= 715 W − no

dimming – no derating

1.425

1.5

1.575

A

P_ILED_MIN

Minimum output current – RSET= 10 kW − no

dimming – no derating

0.18

0.2

0.22

A

P_ILEDCLAMP

LED Current de−rating minimum value in case of

derating, plateau option 50%

100

mA

P_ILED_ACCURACY_200

ILED accuracy for a 200 mA programmed current –

no dimming (RSET = 10 kW)

−10

+10

%

P_ILED_ACCURACY_1500 ILED accuracy for a 1500 mA programmed current –

no dimming _(RSET = 715 W)

−5

+5

%

P_RSENSE

ILED Current sensing resistor value

99

100

101

mW

P_LSSG_PD

LSSG Gate Pull−down impedance – Isink 40 mA

1.5

3

6

W

P_LSSG_PUP

LSSG Gate Pull−up impedance – Isource 40 mA

1.5

3

6

W

P_EXT_LX

Buck Boost inductor value

8

10

12

mH

P_EXT_CBOOT

Boost strap capacitor. Including DC bias derating

100

220

nF

P_EXT_ISET

ISET capacitor for EMC

0.1

2.2

mF

P_EXT_CBAT

BAT pin decoupling capacitor. Including DC bias der-

ating

1

2

4.7

mF

P_EXT_CVOUT

Vout pin decoupling capacitor. Including DC bias

derating

1

2

4.7

mF

P_EXT_CIN_INPUT_PI

Cin of the input Pi Filter

4.7

10

mF

P_EXT_COUT_INPUT_PI

Cout of the input Pi Filter

10

30

mF

P_EXT_LX_INPUT_PI

Inductor of the input Pi Filter

2.2

3.3

mH

P_EXT_CIN_OUTPUT_PI

Cin of the output Pi Filter

2.2

2x4.7

mF

P_EXT_COUT_OUTPUT_PI Cout of the output Pi Filter

0.680

1

mF

P_EXT_LX_OUTPUT_PI

Inductor of the output Pi Filter

2.2

3.3

mH

Table 8. DIM TABLE

Symbol

Parameter Description

Min

Typ

Max

Unit

Notes

P_DIM_IN_DIG

Input duty cycle range, digital mode

1

100

%

(Note 6)

P_DIM_OUT_DIG

Output duty cycle range, digital mode

1

100

%

P_DIM_FREQ

Valid frequency on DIM

80

600

Hz

P_DIM_FREQ_IN_MIN_HYST

Hysteresis of the minimum valid frequency

−1

−2

−3

%

P_DIM_FREQ_ACC

Accuracy of the frequency thresholds

10

%

P_DIM_FREQ_IN_MAX_HYST

Hysteresis of the maximum valid frequency

1

2

3

%

P_DIM_FREQ_OUT

Output frequency of the DIM reconstruction

(from DIM input frequency)

360

400

440

Hz

P_DIM_DC_ACC

DIM dimming reconstruction accuracy based

on DCDC Switching Activity Ratio. From DIM

in to LSSG or SW.

−1

1

%

(Note 7)

P_DIM_DETECT

Detection time of a valid DIM.

25

30

ms

P_DIM_REMOVAL

Detection time of DIM removal

80

90

100

ms