Datasheet

UBA2071_A_1 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 01 — 23 June 2008 26 of 35
NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
f
PWM
PWM frequency
[1]
75 - 1000 Hz
C
CPWM
= 33 nF 306 324 342 Hz
I
ch(CSWP)
charge current on pin CSWP PWMD low; V
CSWP
= 1 V −23 −20 −17 µA
I
dch(CSWP)
discharge current on pin
CSWP
PWMD high; V
CSWP
= 1 V 17 20 23 µA
R
i(PWMA)
input resistance on pin PWMA 80 100 120 kΩ
V
i(PWMA)
input voltage on pin PWMA for minimum PWM duty cycle - 1.24 - V
for maximum PWM duty cycle - 3 - V
δ
PWM(min)
minimum PWM duty cycle
[3]
-12-%
CPWM pin connected to SGND
[3]
-0-%
δ
PWM(max)
maximum PWM duty cycle
[3]
- 100 - %
δ
PWMD
duty cycle on pin PWMD
[3]
12 - 100 %
I
source(PWMD)
source current on pin PWMD V
PWMD
= 3 V - 0.6 - mA
I
sink(PWMD)
sink current on pin PWMD V
PWMD
= 1 V - 1.2 - mA
V
th(H)(PWMD)
HIGH-level threshold voltage
on pin PWMD
- - 1.7 V
V
th(L)(PWMD)
LOW-level threshold voltage on
pin PWMD
0.85 - - V
Communication (COMM pin)
V
L(clk)(COMM)
clock LOW-level voltage on pin
COMM
I
COMM
= 10 µA 0 0.1 0.2 V
I
L(clk)(COMM)
clock LOW-level current on pin
COMM
V
COMM
= 1.5 V - 5.0 - mA
V
H(clk)(COMM)
clock HIGH-level voltage on pin
COMM
I
COMM
= −10 µA 4 4.3 4.6 V
I
H(clk)(COMM)
clock HIGH-level current on pin
COMM
V
COMM
= 2.5 V - −4.5 - mA
V
O(hbswoff)(COMM)
half bridge switch-off output
voltage on pin COMM
PWMD = 5 V - 12 - V
I
th(det)hsw(COMM)
hard switching detection
threshold current on pin
COMM
Clock = high; PWMD = low −120 −100 −80 µA
Protections
V
th(osp)(VFB)
open/short protection threshold
voltage on pin VFB
50 100 150 mV
V
th(ov)(VFB)
overvoltage threshold voltage
on pin VFB
2.40 2.50 2.60 V
R
i(VFB)
input resistance on pin VFB 500 670 840 kΩ
I
dch(CVFB)
discharge current on pin CVFB V
VFB
< V
th(osp)(VFB)
or
V
VFB
>V
th(ov)(VFB)
; V
CVFB
= 2 V
17 20 23 µA
V
th(ovextra)(VFB)
overvoltage extra threshold
voltage on pin VFB
2.9 3.0 3.1 V
Table 6. Characteristics
…continued
T
amb
=25 ° C; V
VDD
=12V; R
IREF
= 33 k Ω ; V
EN
= V
VDD
and CPWM connected to a capacitor, unless otherwise specified. All
voltages are measured with respect to signal ground (SGND, pin 10). SGND and PGND connected together. GL, GH,
COMM, NONFAULT and PWMD pins left open (unless otherwise specified). Currents are positive when flowing into the IC.
Parameters valid for all types (unless otherwise specified).
Symbol Parameter Conditions Min Typ Max Unit