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. 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:
Mains 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
NXP Semiconductors
UBA20271/2
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)
2.6 Other features
Current controlled operating in boost and burn state
External power-down function
Lamp flicker suppression
3. Applications
Dimmable compact fluorescent lamps for power levels from 5 W to 20 W directly
operating from 230 V (UBA20272) and 120 V (UBA20271) mains voltage.
4. Ordering information
Table 1.
Ordering information
Package
Name
UBA20271T/N1
UBA20272T/N1
SO20
SO20
Description
Plastic small outline package; 20 leads; body width 7.5 mm
Plastic small outline package; 20 leads; body width 7.5 mm
Version
SOT163-1
SOT163-1
Type number
UBA20271_UBA20272
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2.1 — 12 October 2011
2 of 33
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Product data sheet
Rev. 2.1 — 12 October 2011
3 of 33
UBA20271_UBA20272
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
5. Block diagram
NXP Semiconductors
V
DD
6
BOOTSTRAP
16 FS
18 DHS
SUPPLY
LEVEL
SHIFTER
HS
driver
GHS
REFERENCE
VOLTAGES
TEMPERATURE
SENSOR
160° 120° 80°
DIVIDE BY 2
LOGIC
DRIVER
LOGIC
17 HBO
19 HBO
LS
driver
GLS
20 HBO
1 SLS
2 SLS
5 V DIGITAL
5 V ANALOG
STATE LOGIC
V
DD(stop)
RESET
CP 13
RESET STATE
START-UP STATE
PREHEAT STATE
IGNITION STATE
HOLD STATE
BOOST STATE
BURN STATE
POWER-DOWN STATE
CAPACITIVE MODE DETECTOR
3 SLS
Vth(capm)SLS
350 V and 600 V Power ICs for dimmable compact fluorescent lamps
PREHEAT CURRENT SENSOR
LOGIC
CB 14
COUNTER
PREHEAT/
BOOST TIMER
5V
Vph(SLS)
LOGIC
INDUCTOR SATURATION/
OVERCURRENT DETECTOR
Vth(ocp)SLS
25 μA
4 LSAT
1 μA
6 μA
60 μA
LOGIC
IGNITION CURRENT DETECTOR
Vth(det)ign(CSI)
SGND 15
5 PGND
REFERENCE
CURRENT
1.27 V
VOLTAGE
CONTROLLED OSCILLATOR
LOGIC
FREQUENCY
CONTROL
BOOST
AMPLIFIER
VLD
BOOST ENABLE
Vclamp
(CSI)
Vth(bst)
(DCI)
START ENABLE
UBA20271/2
OTA
I
V
LAMP
CURRENT
SENSOR
Votp(CSI)
DCI
25 μA
Vth(start)
(DCI)
VT(hec1)
DCI
12 DCI
DSR
LEVEL SHIFT
DIMMER
CONTROL
7
RREF
8
CF
10
CI
11
CSI
9
MDL
001aam772
Fig 1.
Block diagram UBA20271/2
NXP Semiconductors
UBA20271/2
350 V and 600 V Power ICs for dimmable compact fluorescent lamps
6. Pinning information
6.1 Pinning
SLS
SLS
SLS
LSAT
PGND
V
DD
RREF
CF
MDL
1
2
3
4
5
6
7
8
9
20 HBO
19 HBO
18 DHS
17 HBO
16 FS
15 SGND
14 CB
13 CP
12 DCI
11 CSI
001aam784
UBA20271/2
CI 10
Fig 2.
Pin configuration UBA20271/2 (SO20)
6.2 Pin description
Table 2.
Symbol
SLS
LSAT
PGND
V
DD
RREF
CF
MDL
CI
CSI
DCI
CP
CB
SGND
FS
HBO
DHS
[1]
[2]
[3]
Pin description
Pin
1,2,3
4
5
6
7
8
9
10
11
12
13
14
15
16
17,19,20
18
Description
source low-side switch
[1]
coil saturation level input
power ground
[3]
low voltage supply
internal reference current input
voltage controlled oscillator capacitor
minimum dimming level input
voltage controlled oscillator input integrating capacitor
current feedback sense input
dimming level input
preheat timing capacitor
boost timing capacitor
signal ground
[3]
floating supply voltage
half-bridge output
[2]
high-voltage supply
SLS pins are internally connected
HBO pins are internally connected
PGND and SGND are internally connected
UBA20271_UBA20272
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2.1 — 12 October 2011
4 of 33
NXP Semiconductors
UBA20271/2
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.
The UBA20271/2 are rated up to a maximum continuous rectified mains voltage of 350 V
or 500 V, respectively and lamp power-up to 20 W. The UBA20271/2 include all the
necessary functions for preheat, ignition, boost, and on-state operation of the lamp and
includes a linear dimming feature. In addition, several protection measures are included
that safeguard the functioning of the CFL and controller. The controller states are shown
in
Figure 3.
V
DD
= 0
RESET STATE
HOLD = 0
V
DD
> V
DD(rst)
V
DD
< V
DD(rst)
V
DD
< V
DD(rst)
START-UP STATE
V
CP
< V
th(rel)CP
POWER-DOWN STATE
(1)
PREHEAT STATE
(2)
HOLD STATE
(3)
HOLD = 1
preheat time
completed
IGNITION STATE
(4)
Ignition_Detected
(6)
BOOST AND BURN
STATES
(5)
001aam665
(1) V
DD
> V
DD(start)
AND V
i(DCI)
> V
th(start)DCI
AND (HOLD = 0 OR V
CP
< V
th(rel)CP
)
(2) V
DD
< V
DD(stop)
OR V
i(DCI)
< V
th(start)DCI
V
th(hys)DCI
(3) (End of ignition time AND HOLD = 0) OR V
DD
< V
DD(stop)
OR V
i(DCI)
< V
th(start)DCI
V
th(hys)DCI
(4) End of ignition AND HOLD = 1
(5) V
CP
< V
th(pd)CP
OR overcurrent fault time >
1
⁄
10
t
ph
OR f
bridge(max)
detected in capacitive mode
(6) V
DD
< V
DD(stop)
OR V
i(DCI)
< V
th(start)DCI
V
th(hys)DCI
Fig 3.
UBA20271_UBA20272
State diagram
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2.1 — 12 October 2011
5 of 33
Microcontroller MCU
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