UBA2071AT/N1,118 NXP Semiconductors, UBA2071AT/N1,118 Datasheet - Page 6

• Manufacturer Part Number: UBA2071AT/N1,118
• Description: IC DVR HALF BRIDGE 24-SOIC
• Manufacturer: NXP Semiconductors
• Type: CCFL/EEFL Controllerr

Specifications of UBA2071AT/N1,118

• Package / Case: 24-SOIC (7.5mm Width)
• Frequency: 38 ~ 42kHz
• Current - Supply: 1.5mA
• Voltage - Supply: 14V
• Operating Temperature: -25°C ~ 100°C
• Driver Type: CCFL Drivers
• Maximum Operating Temperature: + 100 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935285776118

NXP Semiconductors
Table 3.
8. Functional description
UBA2071_A_1
Product data sheet
Symbol
NONFAULT 12
PWMD
PWMA
EN
VDD
PGND
GL
n.c.
n.c.
n.c.
SH
FS
GH
Pin description
Pin
13
14
15
16
17
18
19
20
21
22
23
24
Description
status signal
input/output
digital PWM dimming
input/output
analog PWM dimming
input
chip enable input
supply input
power ground
low-side driver output
not connected
not connected
not connected
high-side source
connection
floating supply
high-side driver output
The UBA2071 and UBA2071A are designed to drive a half bridge inverter (as shown in
Figure
EEFLs.
The IC has an AC lamp current sense input (IFB). It regulates the average absolute value
of the lamp current by varying its switching frequency. The load is presumed to be
inductive: higher frequency results in lower lamp current.
The UBA2071 and UBA2071A include a PWM dimming function. The ICs switch the
lamps on and off with a frequency lower than the lamp current frequency but higher than
what the human eye can see. The light output of the lamps can be set by setting the ratio
of the on-time and off-time.
These ICs have several forms of protection and the next chapters will describe each
function in more detail.
…continued
3) with a resonant load. The load consists typically of a transformer with CCFLs or
Function
The IC signals a fault condition to external circuits by pulling this pin low. Also
external circuits can signal a fault condition to the IC by pulling this pin low.
Digital output of internally generated PWM signal if a capacitor is connected
to the CPWM pin.
Digital input of PWM signal if the CPWM pin is connected to signal ground.
Remark: The signal on the PWMD pin is active low, so low voltage on the
PWMD pin means lamps are on.
The duty cycle of the internally generated PWM signal is proportional to the
voltage on this pin.
A low voltage on this pin will reset and shut down the IC. This pin is also used
to select between DC blocking capacitor charging mode and normal
operation.
A buffer capacitor must be connected between this pin and power ground.
return for the low-side driver.
Gate connection of the low-side power switch.
HV spacer pin.
HV spacer pin.
HV spacer pin.
Return for high side gate driver. Must be connected to the source of the
high-side half bridge power switch.
A buffer capacitor must be connected between this pin and the SH pin. This
capacitor is charged when the low-side power switch is on and supplies the
high-side driver when the high-side power switch is on.
Gate connection of the high-side half bridge power switch.
Rev. 01 — 23 June 2008
Half bridge control IC for CCFL backlighting
UBA2071; UBA2071A
© NXP B.V. 2008. All rights reserved.
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