UBA3070_10 datasheet(7/16 Pages) NXP

Part #	UBA3070

Description	LED backlight driver IC No binning on LED forward voltage required

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Manufacturer	NXP [NXP Semiconductors]

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UBA3070

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Product data sheet

Rev. 3 — 9 December 2010

7 of 16

NXP Semiconductors

UBA3070

LED backlight driver IC

10. Characteristics

Table 5.

Characteristics

Tamb = 25 ° C; VCC = 15 V; all voltages are measured with respect to ground; currents are positive when flowing into the

UBA3070 IC; unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VBR

breakdown voltage

650

-

V

Supply voltage management (VCC pin)

VCC(startup)

start-up supply voltage

9.3

10

10.6

V

VCC(UVLO)

undervoltage lockout supply

voltage

8.1

8.7

9.3

V

VCC(hys)

hysteresis of supply voltage

VCC(startup) − VCC(UVLO)

1.0

1.3

1.6

V

ICC(oper)

operating supply current

no load on GATE

1.1

1.3

1.5

mA

ICC(startup)

start-up supply current

VCC < VCC(startup)

-

600

μA

ICC(prot)

protection supply current

VCC > VCC(UVLO)

-

0.85

-

mA

Masking management (MASK pin)

Vth(MASK)

threshold voltage on pin MASK

50

100

150

mV

Vclamp(neg)(MASK) negative clamp voltage on pin

MASK

IMASK = −150 μA

−0.5

−0.25

−0.05

V

Vclamp(pos)(MASK) positive clamp voltage on pin

MASK

IMASK = 250 μA

0.5

0.7

0.9

V

Istop(pos)(MASK)

positive stop current on pin MASK

54

60

66

μA

tsup(xfmr_ring)

transformer ringing suppression

time

start secondary stroke

1.1

1.5

1.9

μs

Iprot(MASK)

protection current on pin MASK

VMASK = 50 mV

−50[1]

-

−10

nA

Oscillator

fosc(high)

high oscillator frequency

VPWM is LOW

145

175

205

kHz

PWM duty cycle control (PWM pin)

VIL(en)ILED(PWM)

LED current enable LOW-level

input voltage on pin PWM

[2] -

-

0.5

V

VIH(dis)ILED(PWM) LED current disable HIGH-level

input voltage on pin PWM

[2] 2.0

-

V

Iprot(PWM)

protection current on pin PWM

VPWM = 1.5 V

−1.0[1]

−0.8

−0.5

μA

Valley switch (DRAIN pin)

(

ΔV/Δt)

vrec

valley recognition voltage change

with time

−85

-

+85

V/

μs

td(vrec-swon)

valley recognition to switch-on

delay time

-

150[1]

-

ns

OCP (SENSE pin)

Vsense(max)

maximum sense voltage

ΔV/Δt = 0.1 V/μs

0.48

0.52

0.56

V

tPD

propagation delay

ΔV/Δt = 0.5 V/μs

-

140

185

ns

Vswp

short-winding protection voltage

0.83

0.88

0.95

V

tleb

leading edge blanking time

300

370

440

ns

Istartup(soft)

soft startup current

Rsense < 0.5 V

45

60

75

μA

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