Texas Instruments UCC3752N, UCC3752DTR, UCC3752D, UCC2752N, UCC2752DTR Datasheet
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UCC2752
UCC3752
PRELIMINARY
DESCRIPTION
The UCC3752 controller is designed for driving a power stage that gener
ates low frequency, high voltage sinusoidal signals for telephone ringing
applications. The controller and the power stage are most suitable for up to
5 line applications where low cost, high efficiency and minimum parts count
are critical. A semi-regulated DC voltage is added as an offset to the ring
ing signal. The ring generator operation is non-isolated and open loop.
The UCC3752 directly drives primary side switches used to implement a
push-pull resonant converter topology and transformer coupled sampling
switches located on the secondary of the converter. For normal ring signal
generation, the primary switching frequency and secondary sampling fre
quency are precisely offset from each other by the ringing frequency to pro
duce a high voltage low frequency alias signal at the output. The off-hook
condition is detected by sensing the AC current and when AC limit is ex
ceeded, a flag is generated on the OFFHOOK pin.
The drive signal frequencies are derived from a high frequency (3579545
Hz) crystal. The primary switching frequency is 89.489 kHz and the sam
pling frequency is 20, 25 or 50 Hz less depending on the status of frequency select pins FS0 and FS1.
Resonant Ring Generator Controller
FEATURES
•
Novel Topology for Low-Cost, Efficient
Generation of Ring Voltage
•
Suitable for Multi-Line Operation
•
Selectable 20, 25 and 50 Hz Ring
Frequency
•
Secondary (AC) Current Limiting
Generates an Off-Hook Detect Signal
•
Primary Current Limiting to Turn
Power Stage Off Under Fault
Conditions
•
Operates from a Single 12V Supply
SLUS269 - JULY 1999
1
10
15
4
ENABLE
VDD
OFFHOOK
XTAL2
6
OHD
2
N/C
12
DRVS
9
VS12
5
11
13
DRV1
DCLIM
DRV2
16
XTAL1
8
FS1
7
FS0
14
PGND
3
GND
C
BYP2
SAMPLING
CIRCUIT
C
F
AC SIGNAL
V
OUT
V
1
C
R2
12V
C
DC
DC SIGNAL
Q1
L
IN
V
IN
12V
T1
L
R
L
R
N:1
Q2
D1
C
BYP1
R
SENSE
C
R1
3.579545MHz
UCC3752
TYPICAL APPLICATION
UDG-98058
The circuits described in this datasheet are covered under US Patent #5,663,878 and other patents pending.
2
UCC2752
UCC3752
(TOP VIEW) DIL-16, SOIC-16
N or D Packages
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2V
Analog Inputs (OHD, DCLIM, XTAL1, XTAL2)
Maximum Forced Voltage. . . . . . . . . . . . . . . . . . . . –0.3 to 5V
Logic Inputs
Maximum Forced Voltage . . . . . . . . . . . . . . . . . . –0.3 to 7.5V
Reference Output Current (V
DD). . . . . . . . . . . Internally Limited
Output Current (DRV1, DRV2, DRVS) Pulsed . . . . . . . . . . 1.5A
Operating Junction Temperature . . . . . . . . . . –40°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Note: Unless otherwise indicated, voltages are referenced to
ground and currents are positive into, negative out of, the spe
cific terminals.Pulsed is defined as a less than 10% duty cycle
with a maximum duration of 500
S.
PGND
XTAL2
XTAL1
DRV2
DRVS
ENABLE
DRV1
VS12
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
N/C
OFFHOOK
FS1
OHD
FS0
GND
VDD
DCLIM
CONNECTION DIAGRAMS
FS1 FS0 MODE Sine Wave
Frequency (Hz)
001 20
011 25
101 50
113 0
Table I. Frequency selectability decoding.
FS1 FS0 FDRVS FDRV – FDRVS
0 0 89.469kHz 20Hz
0 1 89.464kHz 25Hz
1 0 89.439kHz 50Hz
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0°C to 70°C for the
UCC3752 and –40°C to +85°C for the UCC2752, T
A = TJ.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
V12 Supply Current Section
Supply Current ENABLE = 0V 0.5 3 mA
ENABLE = 5V 0.5 3 mA
Internal Reference with External Bypass Section
Output Voltage (V
DD) 4.85 5 5.15 V
Load Regulation 0mA ≤IV
DD ≤2mA 5 mV
Line Regulation 10V < V
S12 < 13V, IVDD = 1mA 3 mV
Short Circuit Current VDD = 0 5 10 mA
Output Drivers Section (DRV1, DRV2)
Pull Up Resistance I
LOAD
= 10mA to 20mA 6 15
Pull Down Resistance I
LOAD
= 10mA to 20mA 6 15
Rise Time C
LOAD
= 1nF 50 100 nS
Fall Time C
LOAD
= 1nF 50 100 nS
Output Drivers Section (DRVS)
Pull Up Resistance I
LOAD
= 10mA to 20mA 4 10
Pull Down Resistance I
LOAD
= 10mA to 20mA 4 10
Sample Pulse-Width Mode 1 (Table 1) 280 nS
Rise Time C
LOAD
= 1nF 50 100 nS
Fall Time C
LOAD
= 1nF 50 100 nS
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