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1. General description

The UBA20271/2 are high-voltage power ICs intended to drive and control higher

powered self ballasted Compact Fluorescent Lamp (CFL) lighting applications. The

UBA20271/2 operate from 120 V and 230 V. The module includes a half-bridge power

circuit of two NMOST

power FETs. In addition, a controller circuit is included that has

advanced features for dimming and a lamp current controlled boost feature. The boost

feature is used for boosting cold (amalgam) CFL.

The controller contains a half-bridge drive function for

CFL, a high-voltage level-shift

circuit with integrated bootstrap diode. In addition, the controller contains an oscillator

function, a current control function both for preheat and burn, a timer function and

protection circuits. The UBA20271/2 are supplied via a dV/dt current charge supply circuit

from the half-bridge circuit.

Remark: Main

s voltages noted are AC.

2. Features and benefits

2.1 Half-bridge features

 UBA20271: Two internal 350 V, 1.0  max 5.0 A NMOST half-bridge power FETs

 UBA20272

: Two internal 600 V, 3.0 , max 2.7 A NMOST half-bridge power FETs

 Integrated high-voltage level-shift function

with integrated bootstrap diode

2.2 Preheat and ignition features

 Coil saturation protection during ignition

 Adjustable saturation protection level

 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

2.4 Dim features

 Continuously variable dimming function for standard phase cut dimmers

UBA20271/2

350 V and 600 V Power ICs for dimmable compact fluorescent

lamps

Rev. 2.1 — 12 October 2011 Product data sheet

Summary of content (33 pages)

PAGE 1
UBA20271/2 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Rev. 2.1 — 12 October 2011 Product data sheet 1. General description The UBA20271/2 are high-voltage power ICs intended to drive and control higher powered self ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20271/2 operate from 120 V and 230 V. The module includes a half-bridge power circuit of two NMOST power FETs.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps  Natural dimming curve by logarithmic correction  Adjustable Minimum Dimming Level (MDL)  Controlled lamp ON/OFF 2.5 Protection      OverCurrent Protection (OCP) in boost and burn state Capacitive Mode Protection (CMP) OverPower Protection (OPP) Power-down function OverTemperature Protection (OTP) 2.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 6. Pinning information 6.1 Pinning SLS 1 20 HBO SLS 2 19 HBO SLS 3 18 DHS LSAT 4 17 HBO PGND 5 VDD 6 RREF 7 14 CB CF 8 13 CP MDL 9 12 DCI CI 10 11 CSI UBA20271/2 16 FS 15 SGND 001aam784 Fig 2. Pin configuration UBA20271/2 (SO20) 6.2 Pin description Table 2.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 7. Functional description The UBA20271/2 are ICs with integrated half-bridge MOSFETs in self ballasted high-power CFL and their derivatives. The UBA20271/2 are equipped with variable dimming functionality that has a logarithmic corrected natural dimming function. This function enables a less sensitive brightness control of the lamp at low dim levels.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 7.1 Lamp start-up cycle 7.1.1 Reset state The UBA20271/2 are in a reset state while the supply voltage on the VDD pin is lower than the VDD(rst) level. In the reset state, a part of the internal supply is turned off, all registers, counters and timers are undefined. In addition, the hold state latch is reset and both the high and low-side transistor are non-conductive.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps The preheat time consists of eight saw-toothed pulses at the CP pin. Preheat begins as soon as the capacitor on the CP pin is charged to a voltage higher than Vth(CP)max. During the preheat time, the current feedback sensor circuit (input CSI pin) is disabled. To increase noise immunity, an internal filter of 30 ns is included at the SLS pin.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 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 7.1.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 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, the lamp current feedback control circuit operates the same as in the burn state. This action is used to improve lamp stability. Lamp current boosted by a fixed ratio of 1.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps internal current output of the OTA is transferred via an integrator on the CI pin to the input of the Voltage Controlled Oscillator (VCO). The VCO regulates the frequency and as a result, the lamp current. BOOST AND BURN STATES Vi(DCI) > Vth(bst)DCI AND boost boost timer running (2) 00 burn select 01 boost Boost_ratio = 1 Boost_ratio = 1.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps When CP is lower than Vth(rel)CP, the IC is released from the hold state and moves to the start-up state. See Figure 3. Alternatively, the hold state ends when the supply voltage is lower than VDD(rst) and the IC is reset. With a 470 nF capacitor on the CP pin, the typical hold state retention delay is between 1.0 seconds and 1.7 seconds.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps voltage (V) VCF 0 tdch V(GHS-HBO) 0 VGLS tno tno 0 VHBO 0 time (s) 001aam766 Fig 8. Sawtooth, gate driver and half-bridge output signals 7.2.2 Combined timing circuit A combined timing circuit is included to determine the preheat time, ignition enabling time and overcurrent time, see Figure 9. The circuit consists of a clock generator defined by CCP and Rext(RREF) and a counter.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps voltage (V) ignition enabling time 5V VCP Vth(CP)max 4.5 V Vth(CP)min 3.8 V CFL ignition overcurrent ignition time startup time preheat time 0V fault time boost-burn power down time (s) 001aam768 Fig 9. Timing diagram preheat, ignition and overcurrent 7.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps voltage (V) 1.2 Vi(CSI) [VRMS] internal clamp (1) Vclamp(CSI) 1.0 100 % 0.8 0.6 VLD 0.4 midcurve 0.2 Vth(hys)DCI MDL 0 0 0.4 0.2 VT(hec1)DCI 0.6 0.8 VT(hec2)DCI 1.0 0.9 Vth(start)DCI 1.2 1.4 1.6 Vi(DCI) (V) voltage (V) VT(hec3)DCI 001aam671 (1) Vi(CSI) = VLD = f(Vi(DCI)) Fig 10. CSI voltage as a function of DCI voltage 7.4 Protection and power-down 7.4.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps and external resistor RLSAT connected to the LSAT pin, a more secure setting of the threshold level Vth(sat)SLS is possible. When resistor RLSAT is not mounted, the Vth(sat)SLS level is internally clamped at 2.5 V. CLSAT parallel to RLSAT is obligatory for stability reasons even when RLSAT is not mounted. 7.4.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 7.4.5 Power-down mode Power-down mode starts when: • a continuous overcurrent exceeds the maximum overcurrent time-out tfault(oc).Or over a longer period when an overcurrent occurs in more than half the number of cycles Vth(CP)min is reached.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 8. Limiting values Table 3. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions Min Max Unit Rext(RREF) external resistance on pin RREF fixed nominal value 33 k 30 36 k SR slew rate on pins HBO with respect to GND 4 +4 V/ns P = 0.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 3. Limiting values …continued In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter VCI VMDL Conditions Min Max Unit voltage on pin CI 0 3.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 5. Characteristics …continued VDD = 13 V; VFS - VHBO = 13 V; Tamb = 25 C; settings according to default setting in Table 6, all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit UBA20271; 300 V on high-voltage pins - - 30 A UBA20272; 500 V on high-voltage pins - - 30 A 2.7 3.0 3.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 5. Characteristics …continued VDD = 13 V; VFS - VHBO = 13 V; Tamb = 25 C; settings according to default setting in Table 6, all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Ron(150)/Ron(25) on-state resistance ratio (150 C to 25 C) Conditions Min Typ Max Unit RON at Tj = 150 C / RON at Tj = 25 C - 1.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 5. Characteristics …continued VDD = 13 V; VFS - VHBO = 13 V; Tamb = 25 C; settings according to default setting in Table 6, all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Vth(CB)min Conditions Min Typ Max Unit minimum threshold voltage on pin CB - 1.1 - V Vth(CB)max maximum threshold voltage on pin CB - 3.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 5. Characteristics …continued VDD = 13 V; VFS - VHBO = 13 V; Tamb = 25 C; settings according to default setting in Table 6, all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit 0.55 0.60 0.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 5. Characteristics …continued VDD = 13 V; VFS - VHBO = 13 V; Tamb = 25 C; settings according to default setting in Table 6, all voltages referenced to GND, positive currents flow into the IC, unless otherwise specified. Symbol Parameter Vth(start)DCI Conditions Min Typ Max Unit start threshold voltage on pin DCI - 0.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 11. Application information 11.1 Design equations All equations are only valid for Rext(RREF) = 33 k 11.1.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 0.5 f bridge  min  = ---------------------------------------------------------------------------C CF + C par ---------------------------  V th  CF max + t dch I o  CF min (8) • Minimum bridge frequency with enabled boost 0.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 6. Typical components for a 230 V mains application Reference Component UBA20271 UBA20271_UBA20272 Product data sheet Description UBA20272 R1 10 10 R2, R3 110 k 220 k R4 22 k 22 k R5, R6 110 k 330 k R7, R10 100 k 100 k R8 560  1 k R9 1 k 1 k R11 39 k 39 k RREF 33 k; 1 % 33 k; 1 % RSLS 1 1.2  RMDL 1 k 1 k RCSI 8.2  8.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps Table 6. Typical components for a 230 V mains application …continued Reference Component L1 UBA20271_UBA20272 Product data sheet Description UBA20271 UBA20272 4.7 mH 4.7 mH mains filter inductor; ISAT = 300 mA lamp inductor L2 1000/4/4 H 2000/2/2 H D9 1N4148 1N4148 All information provided in this document is subject to legal disclaimers. Rev. 2.1 — 12 October 2011 © NXP B.V. 2011.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 12. Package outline SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 D E A X c HE y v M A Z 11 20 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 10 e bp detail X w M 0 5 10 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 mm 2.65 0.3 0.1 2.45 2.25 0.25 0.49 0.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 13. Abbreviations Table 7.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 14. Revision history Table 8. Revision history Document ID Release date Data sheet status Change notice Supersedes UBA20271_UBA20272 v.2.1 20111012 Product data sheet - UBA20271_UBA20272 v.2 Modifications: • • • minor text changes. Figure 1 changed. Figure 2 changed. UBA20271_UBA20272 v.2 20110816 Product data sheet - UBA20271_UBA20272 v.1 UBA20271_UBA20272 v.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 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.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 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.
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UBA20271/2 NXP Semiconductors 350 V and 600 V Power ICs for dimmable compact fluorescent lamps 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 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 7.1.7 7.2 7.2.1 7.2.2 7.3 7.4 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 8 9 10 11 11.1 11.1.1 11.1.2 11.1.3 11.1.4 11.1.5 11.1.6 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Half-bridge features . . . . . . . . . . . . . . . . . . . .