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UBA2024AT-UBA2024P-UBA2024T
Half-bridge power IC for CFL lamps
1. General description
The UBA2024 is a family of high-voltage monolithic Integrated Compact Fluorescent
Lamp (CFL) drivers for a large range of lamp powers. Specific versions are optimized for
230 V and 110 V mains supplies. The product family integrates full CFL controller
functionality with high voltage half-bridge transistors. All products in the UBA2024 family
are pin-to-pin compatible enabling a single application design covering a wide range of
power ratings.
The IC features a soft start function, an adjustable internal oscillator and an internal drive
function with a high-voltage level shifter for driving the half-bridge.
To guarantee an accurate 50 % duty cycle, the oscillator signal is passed through a divider
before being fed to the output drivers.
2. Features and benefits The common feature set includes: high power efficiency a high integration level with low component counts enabling small form factor
electronic ballast integrated bootstrap diode soft start function minimum glow time control integrated low-voltage supply adjustable operating frequency as a result of the embedded oscillator an accurate 50 % duty cycle provided by an embedded oscillator signal integrated half-bridge power transistors an internal drive function with a high-voltage level shifter up to 550 V (300 V for the
UBA2024BP and UBA2024BT)
3. Applications Driver for any kind of half-bridge configured load up to 23 W, provided that the
maximum junction temperature is not exceeded Designed for electronically self-ballasted CFL lamps
UBA2024
Half-bridge power IC for CFL lamps
Rev. 6.2 — 1 November 2010 Product data sheet
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
4. Ordering information
[1] For this type number, RDS(on) = 9 Ω and ISAT = 900 mA.
[2] For this type number, RDS(on) = 6 Ω and ISAT = 1350 mA.
[3] For this type number, RDS(on) = 6.4 Ω and ISAT = 1200 mA.
[4] For this type number, RDS(on) = 2 Ω and ISAT = 2500 mA.
5. Block diagram
Table 1. Ordering information
UBA2024P[1] DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
UBA2024T[1] SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
UBA2024AP[2] DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
UBA2024AT[3] SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
UBA2024BP[4] DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
UBA2024BT[4] SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
6. Pinning information
6.1 Pinning
6.2 Pin description
Table 2. Pin description 1 8 sweep timing input
SGND 2 1, 2, 3, 5, 9,
10, 13
signal ground 3 11 high-side floating supply output
PGND 4 12 power ground
OUT 5 14 half-bridge output 6 4 high-voltage supply
VDD 7 6 internal low-voltage supply output 8 7 internal oscillator input
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
7. Functional description
7.1 Supply voltage
The UBA2024 does not require an external low-voltage supply as the mains supply
voltage applied to pin HV powers it. The IC derives its own low supply voltage from this for
its internal circuitry.
7.2 Start-up state
With an increase of the supply voltage on pin HV, the IC enters the start-up state. In the
start-up state the high-side power transistor is not conducting and the low-side power
transistor is switched on. The internal circuit is reset and the capacitors on the bootstrap
pin FS and low-voltage supply pin VDD are charged. Pins RC and SW are switched to
ground. The start-up state is defined until VDD = VDD(startup).
7.3 Sweep mode
The IC enters the sweep mode when the voltage on pin VDD > VDD(startup). The capacitor
on pin SW is charged by ISW and the half-bridge circuit starts oscillating. The circuit enters
the start-up state again when the voltage on pin VDD < VDD(stop).
The sweep time (tsweep) is determined by the charge current (Ich(sw)) and the external
capacitor (CSW). Typical the total sweep time set by CSW is:
(1)
During the sweep time the current flowing through the lamp electrodes performs some
preheating of the filaments. See Figure5.
7.4 Reset
A DC reset circuit is incorporated in the high-side driver. The high-side transistor is
switched off when the voltage on pin FS is below the high-side lockout voltage Vfloat(UVLO).
7.5 Oscillation
The oscillation is based upon the 555-timer function. A self oscillating circuit is made with
the external resistor ROSC and the capacitor COSC (see Figure 4).
To realize an accurate 50 % duty cycle, an internal divider is used. This reduces the bridge
frequency to half the oscillator frequency.
The output voltage of the bridge will change at the falling edge of the signal on pin RC.
The design equation for the half-bridge frequency is:
(2)
An overview of the oscillator signal, internal LS and HS drive signals and the output is
given in Figure4. sweep CSW nF() 10.3 ms×=osc 1 OSC× C OSC×---------------------- -------------------=
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
When entering the sweep mode (VSW=0 V), the bridge oscillator starts at 2.5 times the
nominal bridge frequency and sweeps down to the nominal frequency (bridge), set by
ROSC and COSC. During the sweep mode the amplitude of the RC oscillator on pin RC, will
swing between Vtrip(osc)low and VSW +0.4Vtrip(osc)high. The amplitude of the RC oscillator
will continue to increase until VSW +0.4Vtrip(osc)high =Vtrip(osc)high, this determines the end
of the sweep time. The voltage on pin SW however will continue to rise until it reaches
supply voltage level.
During this continuous decrease in frequency, the circuit approaches the resonance
frequency of the load, and this causes a high voltage across the load, which ignites the
lamp. The sweep to resonance time should be much larger than the settling time of the
supply voltage on pin HV, to guarantee that the full high-voltage is present at the moment
of ignition. See Figure5.
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
7.6 Non-overlap time
The non-overlap time is defined as the time when both MOSFET s are not conducting. The
non-overlap time is fixed internally.
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
8. Limiting values
[1] The maximum junction temperature must not be exceeded.
9. Thermal characteristics
[1] In accordance with IEC 60747-1
Table 3. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
VHV voltage on pin HV normal operation
UBA2024P - 373 V
UBA2024AP - 373 V
UBA2024T - 373 V
UBA2024AT - 373 V
UBA2024BP - 187 V
UBA2024BT - 187 V
mains transients during 0.5s
UBA2024P - 550 V
UBA2024AP - 550 V
UBA2024T - 550 V
UBA2024AT - 550 V
UBA2024BP - 300 V
UBA2024BT - 300 V
VFS voltage on pin FS VHV VHV +14 V
VDD supply voltage low voltage; DC supply 0 14 V
IDD supply current low voltage; peak value is internally
limited; Tamb =25°C
05mA
VPGND voltage on pin PGND referenced to SGND −1+1 V
VRC voltage on pin RC IRC< 1mA 0 VDD V
VSW voltage on pin SW ISW< 1mA 0 VDD V slew rate pin OUT; repetitive −4+4 V/ns junction temperature [1] −40 +150 °C
Tamb ambient temperature −40 +150 °C
Tstg storage temperature −55 +150 °C
Table 4. Thermal characteristics
Rth(j-a) thermal resistance from junction to ambient in freeair [1]
SO14 package 95 K/W
DIP8 package 95 K/W
Rth(j-c) thermal resistance from junction to case in freeair [1]
SO14 package 8 K/W
DIP8 package 16 K/W
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
10. CharacteristicsTable 5. Characteristics
Tj = 25 °C; all voltages are measured with respect to SGND; positive currents flow into the IC.
High-voltage supply
VHV voltage on pin HV mains transients during 0.5 s; IHV < 30 μA
UBA2024P 0 - 550 V
UBA2024AP 0 - 550 V
UBA2024T 0 - 550 V
UBA2024AT 0 - 550 V
UBA2024BP 0 - 250 V
UBA2024BT 0 - 250 V
VFS voltage on pin FS mains transients during 0.5 s; IHV < 30 μA
UBA2024P 0 - 564 V
UBA2024AP 0 - 564 V
UBA2024T 0 - 564 V
UBA2024AT 0 - 564 V
UBA2024BP 0 - 264 V
UBA2024BT 0 - 264 V
Low-voltage supply
VDD supply voltage VHV =100 V; Rosc= ∞; VSW =VDD;
VRC =0V
11.4 12.5 13.3 V
Start-up state
IHV current on pin HV VHV =100 V; Rosc= ∞; VSW =VDD;
VRC =0V - 0.39 mA
VDD(startup) start-up supply voltage 10 11 12 V
VDD(stop) stop supply voltage 8 8.5 9 V
VDD(hys) hysteresis of supply voltage 2 2.5 3 V
NXP Semiconductors UBA2024
Half-bridge power IC for CFL lamps
Output stage
Ron on-state resistance HS transistor; VHV =310 V; ID= 100 mA
UBA2024P - 9.7 11 Ω
UBA2024T - 9.7 11 Ω
UBA2024AP - 6.5 7.4 Ω
UBA2024AT - 7.0 8.0 Ω
HS transistor; VHV =160 V; ID= 100 mA
UBA2024BP - 2.0 2.35 Ω
UBA2024BT - 2.0 2.35 Ω
LS transistor; ID= 100 mA
UBA2024P - 8.5 9.4 Ω
UBA2024T - 8.5 9.4 Ω
UBA2024AP - 5.7 6.3 Ω
UBA2024AT - 6.2 6.9 Ω
UBA2024BP - 2.3 2.55 Ω
UBA2024BT - 2.3 2.55 Ω forward voltage HS; IF= 200 mA - - 2.0 V
LS; IF= 200 mA - - 2.0 V
bootstrap diode; IF=1 mA 0.7 1.0 1.3 V
IDsat drain saturation current HS; VDS =30V; Tj ≤ 125 °C; VHV= 310V
UBA2024P 900 - - mA
UBA2024AP 1350 - - mA
UBA2024T 900 - - mA
UBA2024AT 1200 - - mA
HS; VDS =30V; Tj ≤ 125 °C; VHV= 160V
UBA2024BP 2500 - - mA
UBA2024BT 2500 - - mA
LS; VDS =30V; Tj≤ 125°C
UBA2024P 900 - - mA
UBA2024AP 1350 - - mA
UBA2024T 900 - - mA
UBA2024AT 1200 - - mA
UBA2024BP 2500 - - mA
UBA2024BT 2500 - - mA
tno non-overlap time 1 1.35 1.7 μs
Vfloat(UVLO) undervoltage lockout
floating voltage
3.6 4.2 4.8 V
Table 5. Characteristics …continued
Tj = 25 °C; all voltages are measured with respect to SGND; positive currents flow into the IC.

Partno	Mfg	Dc	Qty	Available	Descript
UBA2024AT	NXP	N/a	280	avai	Half-bridge power IC for CFL lamps
UBA2024P	PHI	N/a	47	avai	Half-bridge power IC for CFL lamps
UBA2024P	NXP	N/a	447	avai	Half-bridge power IC for CFL lamps
UBA2024T	NXP	N/a	133	avai	Half-bridge power IC for CFL lamps
UBA2024T	PH	N/a	2	avai	Half-bridge power IC for CFL lamps