UBA2016AP datasheet(18/42 Pages) PHILIPS

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UBA2016A_15_15A

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Objective data sheet

Rev. 1 — 20 May 2011

18 of 42

NXP Semiconductors

UBA2016A/15/15A

600 V fluorescent lamp driver

The amount of boost depends on the current into the BOOST pin and the lamp current

control. If the application does not use lamp current control, the switching frequency will

go down to the lowest possible boost switching frequency fsw(bst)(low) (point G in Figure 11

“Resonance curve application with UBA2016A”) that is determined by Equation 1 or

Equation 2, depending on the value of IBOOST.

(1)

(2)

If the application uses lamp current control, the switching frequency is regulated to boost

regulation voltage on pin IFB, Vreg(bst)(IFB) (point F in Figure 11 “Resonance curve

application with UBA2016A”) that can be calculated by Equation 3 or Equation 4,

(depending on the value of IBOOST) if the switching frequency remains above fsw(bst)(low),

otherwise the switching frequency is fsw(bst)(low); see Equation 1 or Equation 2.

(3)

(4)

7.4.8 Stop state

When in Stop state the IC is off and all driver outputs are low. The IC will remain in Stop

state until the voltage on pin VDD drops below Vrst(VDD) or it is disabled, in which case it

will go to Reset state.

The sequence of events for entering the Stop state are shown in Figure 9 “State diagram”.

7.5 Enable and Disable

The enable function is only available in the UBA2015 and UBA2015A and works via pin

PH/EN. If this pin is pulled below the enable voltage Ven(PH/EN) then the IC goes into the

Standby state (immediately if GLHB is high, otherwise it will continue its normal clock

cycle until GLHB is high and then go to the Standby state).

The external interface with pin PH/EN for the enable signal should be an open collector or

open drain type driver. To enable the IC the open collector or open drain should be open

(high ohmic) to not disturb the fixed frequency preheat setting function of pin PH/EN.

In Restart, Standby and Stop states the standby pull-up current source Ipu(stb)(PH/EN) will

pull the voltage at pin PH/EN above Ven(PH/EN). In Preheat, Ignition and Burn states the

normal output voltage driver of the IC will pull the pin high. In those cases the external

driver must draw a current Iclamp(PH/EN) from the pin to disable the IC.

7.6 Protection circuits

7.6.1 End-of-life rectifying lamp detection

If voltage on pin EOL is below low threshold voltage Vth(low)EOL or above Vth(high)EOL the

fault timer will start. These threshold voltage levels are related to pin FBPFC voltage

according to the formula: Vth(low)EOL =VFBPFC =Vth(high)EOL / 2. The FBPFC voltage is

sampled during GPFC low and hold during GPFC high periods to prevent disturbance of

the EOL levels due to the switching of the PFC.

BOOST

sat BOOST

()

sw bst

() low

()

→

≤≤

sw low

() 1IBOOST

–

fbst

() low

()

⋅

()

BOOST

sat BOOST

()

sw bst

() low

()

→

sw low

() 1Isat BOOST

()

–

fbst

() low

()

⋅

()

BOOST

sat BOOST

()

reg IFB

()

→

≤≤

BOOST

()

reg IFB

() 1IBOOST

lbst

()reg

⋅

()

BOOST

sat BOOST

()

reg bst

() IFB

()

→

reg IFB

()

sat BOOST

() NVreg bst

()

⋅

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