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1. General description

The UBA20260 is a high-voltage integrated circuit designed to control high power

self-ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20260 is a

controller circuit with advanced features for step dimming and a lamp current controlled

boost feature for boosting cold (amalgam) CFLs.

The controller contains a half-bridge drive function for CFLs, a high-voltage level-shift

circuit with integrated bootstrap diode, an oscillator function, a current control function for

preheat and burn, a timer function and protection circuits. The UBA20260 is supplied

using the dV/dt current charge supply circuit from the half-bridge circuit.

Remark: The mains voltages given in this data sheet are AC voltages.

2. Features and benefits

2.1 Half-bridge features

 Integrated high-voltage level-shift function with integrated bootstrap diode

2.2 Preheat and ignition features

 Coil saturation protection during ignition

 Adjustable preheat time

 Adjustable preheat current

 Ignition lamp current detection

2.3 Lamp boost features

 Adjustable boost timing

 Fixed boost current ratio of 1.5

 Gradually boost to burn transition timing

UBA20260

600 V driver IC for step dimmable CFLs

Rev. 2 — 10 October 2011 Product data sheet

Summary of content (30 pages)

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UBA20260 600 V driver IC for step dimmable CFLs Rev. 2 — 10 October 2011 Product data sheet 1. General description The UBA20260 is a high-voltage integrated circuit designed to control high power self-ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20260 is a controller circuit with advanced features for step dimming and a lamp current controlled boost feature for boosting cold (amalgam) CFLs.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 2.4 Dim features  4-level step dimming adjustment using a standard on/off mains switch  Adjustable memory retention time for step dimming  Adjustable minimum dimming level 2.5 Protection      OverTemperature Protection (OTP) Capacitive Mode Protection (CMP) OverPower Protection (OPP) OverCurrent Protection (OCP) in both boost and burn states Power-down function 2.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 6. Pinning information 6.1 Pinning SLS 1 16 GHS GLS 2 15 HBO PGND 3 14 FS VDD 4 13 SGND UBA20260 RREF 5 12 CB CF 6 11 CP MDL 7 10 n.c. CI 8 9 CSI 001aam762 Fig 2. Pin configuration (SOT109-1) 6.2 Pin description Table 2.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 7. Functional description 7.1 Supply voltage The UBA20260 is an IC for driving external half-bridge MOSFETs in self-ballasted high-power CFLs. The UBA20260 has no dimming control input but instead, four preset fixed dimming levels. Only minor adjustment of the presets is possible. The UBA20260 is rated for a maximum continuous rectified mains voltage of 500 V (with peak 600 V).
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 7.2 Lamp start-up cycle 7.2.1 Reset state The UBA20260 is in the reset state when the supply voltage on the VDD pin is below the VDD(rst) level. In the reset state, part of the internal supply is turned off and all registers, counters and timers are undefined. The hold state latch is reset and both the external high and low side power transistors (Q1/Q2) are non-conductive.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs New preheat cycles start after the CP pin level slowly discharges until VCP < Vth(rel)CP and recharges above Vth(CP)max provided VDD > VDD(start) (see Figure 5). f (kHz) 100 start frequency CFL ignition A B C preheat frequency 100 % boost bottom ~22 kHz time (s) preheat ignition boost transition burn 001aam764 Fig 4. CFL frequency from start to burn state 7.2.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs voltage (V) 5V 2nd failed ignition attempt 1st failed ignition attempt VCP Vth(CP)max Vth(CP)min discharge to 0 V Vth(rel)CP startup time 1st preheat time tph HOLD STATE 2nd preheat time ten(ign) td(restart) tph 1st ignition enabling time restart delay time 2nd startup POWER DOWN STATE ten(ign) 2nd ignition enabling time 0V time (s) 001aan537 Fig 5. Retry cycle 7.2.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs voltage (V) 5V VCP Vth(CP)max 4.5 V 1 32 Vth(CP)min 3.8 V Vth(CB)max 3.6 V VCB Vth(CB)min 1.1 V 1 2 61 62 63 0.6 V ignition boost 0V transition burn time (s) 001aam765 Fig 6. Boost timing In the boost state, a lamp current feedback control is implemented to improve lamp stability (see Section 7.2.6). The lamp current has a fixed ratio of 1.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs BOOST AND BURN STATES Temp < Tj(bp)bst AND NOT Boost_Disable 00 burn select Dim_1 state AND Boost boost timer running 01 boost Boost_ratio = 1 Boost_ratio = 1.5 NOT (Boost OR Boost transition) Temp < Tj(otp) - Tj(otp)(hys) Temp > Tj(bp)(bst) OR Boost_Disable Vi(CSI) = Votp(CSI) (66 % level) Vi(CSI) = Vdamp(CSI) (100 % level) Temp > Tj(end)bst OR boost timer ended Temp > Tj(otp) 10 burn Fig 7.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs the supply voltage VDD rises between VDD(stop) and VDD(start). Typically, the supply current is 2 mA when VDD falls between VDD(start) and VDD(stop). More current is drawn during the fall in VDD because the internal analog supply is turned on when VDD > VDD(start). This function enables the comparators to monitor the voltage on the CP pin and if the supply voltage VDD falls below VDD(stop). 7.3 Oscillation and timing 7.3.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 7.3.2 Combined timing circuit A combined timing circuit is used to determine the preheat time, ignition enabling time and overcurrent time (see Figure 9). CCP, Rext(RREF) and the counter comprise the clock generator circuit. When the timer is not running, CCP is charged to 5 V. The timing circuit starts operating after the start-up state when the VDD supply voltage has reached VDD(start) and the voltage on the CP pin passes Vth(CP)max.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs voltage (V) dim step change VDD(start) VDD VDD(stop) lamp on old dim level lamp off lamp on new dim level VDD(rst) 5 VCP Vret(dim)CP time (s) 0 retention start-up 001aam769 Fig 10. Supply voltage cycle for dim step change Four internal references determine the actual internal set point levels used for the different step dim levels.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Vi(CSI) VRMS 1.2 1.0 Vclamp(CSI) DIM_1 100 % Internal clamp 0.8 VDD off-on toggle 0.6 VDD off-on toggle DIM_2 0.4 ∆Vdim2(CSI) 0.2 (1) DIM_3 ∆Vdim3(CSI) Vi(CSI) = VMDL (1) MDL 0 (1) = VDD off-on toggle 001aam770 Fig 11. Voltage on pin CSI as function of dim step As the internal step reference voltages are independent from the mains voltage, the lamp current output is kept constant.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs switching cycle. The injected current is maintained until the end of the switching cycle. This action immediately increases the half-bridge switching frequency. Additionally, for each successive cycle that coil saturation is detected, capacitor CCI discharges enabling ignition time-out detection in the ignition state. CSP is triggered when the voltage on the SLS pin exceeds Vth(sat)SLS (typically 2.5 V).
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs The capacitive mode sink current starts to discharge the capacitor/resistor circuitry on the CI pin and as a result, gradually increases the half-bridge frequency. Discharging continues for the remainder of the current switching cycle ensuring the total current on the CI pin is equal to the sink current. If capacitive mode persists, the action is repeated until capacitive mode is no longer detected.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 8. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134).
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 10. Characteristics Table 5. Characteristics VDD = 13 V; VFS  VHBO = 13 V; Tamb = 25 C; settings according to default setting see Table 6 on page 25, all voltages referenced to PGND and SGND, positive currents flow into the UBA20260, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VDD(rst) reset supply voltage HS = off; LS = on 5.7 6.2 6.7 V VDD(stop) stop supply voltage 9.6 10 10.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Table 5. Characteristics …continued VDD = 13 V; VFS  VHBO = 13 V; Tamb = 25 C; settings according to default setting see Table 6 on page 25, all voltages referenced to PGND and SGND, positive currents flow into the UBA20260, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit bootstrap diode; IFS = 5 mA; (VF = VDD - VFS) 1.3 1.7 2.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Table 5. Characteristics …continued VDD = 13 V; VFS  VHBO = 13 V; Tamb = 25 C; settings according to default setting see Table 6 on page 25, all voltages referenced to PGND and SGND, positive currents flow into the UBA20260, unless otherwise specified.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Table 5. Characteristics …continued VDD = 13 V; VFS  VHBO = 13 V; Tamb = 25 C; settings according to default setting see Table 6 on page 25, all voltages referenced to PGND and SGND, positive currents flow into the UBA20260, unless otherwise specified.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 11. Application information 11.1 Design equations All described equations are only valid for Rext(RREF) = 33 k. 11.1.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 11.1.3 CCF related frequency equations • Maximum bridge frequency 0.5 f bridge  max  = ---------------------------------------------------------------------------C CF + C par ---------------------------  V th  CF max + t dch I o  CF max (8) Where Cpar = 4.7 pF and tdch = 0.4 s. • Minimum bridge frequency with disabled boost 0.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 11.2 Application Diagram D5 D6 C17 C3 12 R5 Q1 GHS C11 L2 FS R6 16 11 D1 L1 HBO D2 C9 C1 CFL C2 C10 D3 D8 D7 VDD Q2 C6 GLS SLS C5 C4 C8 R9 CSI n.c. RCSI C7 RSLS CCP R8 8 15 4 C13 D4 CP CCB 14 C12 R1 CB 7 UBA20260 5 2 6 1 CI MDL C15 C16 RMDL RREF RREF CF CCF 9 10 3 13 PGND SGND 001aam771 Fig 12.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Table 6. UBA20260 Product data sheet Typical application components for a 230 V (AC) mains application Reference Component Description R1 4.7 2 W fusible resistor R5; R6 220 k R8 2.2 k R9 1 k RREF 33 k; 1 % RSLS 1.2  adjust for preheat current RMDL 1 k adjust for minimum lamp current RCSI 8.2  adjust for nominal lamp current C1 47 nF; 630 V C2 22 nF; 630 V C3 47 nF; 400 V C4 10 F; 400 V C5 4.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 12. Package outline SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1 D E A X c y HE v M A Z 16 9 Q A2 A (A 3) A1 pin 1 index θ Lp 1 L 8 e 0 detail X w M bp 2.5 5 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y Z (1) mm 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 10.0 9.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 13. Abbreviations Table 7.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 15. Legal information 15.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications.
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UBA20260 NXP Semiconductors 600 V driver IC for step dimmable CFLs 17. Contents 1 2 2.1 2.2 2.3 2.4 2.5 2.6 3 4 5 6 6.1 6.2 7 7.1 7.2 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7 7.3 7.3.1 7.3.2 7.4 7.5 7.5.1 7.5.2 7.5.3 7.5.4 7.5.5 7.5.6 8 9 10 11 11.1 11.1.1 11.1.2 11.1.3 11.1.4 11.1.5 11.2 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Half-bridge features . . . . . . . . . . . . . . . . . . . . .