UCC15702 Modulator Datasheet

UCC15702 Datasheet, PDF, Equivalent


Part Number

UCC15702

Description

Advanced Voltage Mode Pulse Width Modulator

Manufacture

Unitrode

Total Page 20 Pages
Datasheet
Download UCC15702 Datasheet


UCC15702
application
INFO
available
Advanced Voltage Mode Pulse Width Modulator
UCC15701/2
UCC25701/2
UCC35701/2
FEATURES
DESCRIPTION
700kHz Operation
Integrated Oscillator/ Voltage Feed
Forward Compensation
Accurate Duty Cycle Limit
Accurate Volt-second Clamp
Optocoupler Interface
Fault Counting Shutdown
Fault Latch off or Automatic Shutdown
Soft Stop Optimized for Synchronous
Rectification
1A Peak Gate Drive Output
The UCC35701/UCC35702 family of pulse width modulators is intended for
isolated switching power supplies using primary side control. They can be
used for both off-line applications and DC/DC converter designs such as in
a distributed power system architecture or as a telecom power source.
The devices feature low startup current, allowing for efficient off-line start-
ing, yet have sufficient output drive to switch power MOSFETs in excess of
500kHz.
Voltage feed forward compensation is operational over a 5:1 input range
and provides fast and accurate response to input voltage changes over a
4:1 range. An accurate volt-second clamp and maximum duty cycle limit
are also featured.
Fault protection is provided by pulse by pulse current limiting as well as the
ability to latch off after a programmable number of repetitive faults has oc-
curred.
130mA Start-up Current
Two UVLO options are offered. UCC35701 family has turn-on and turn-off
750mA Operating Current
thresholds of 13V/9V and UCC35702 family has thresholds of 9.6V/8.8V.
The UCC35701/2 and the UCC25701/2 are offered in the 14 pin SOIC (D),
14 pin PDIP (N) or in 14 pin TSSOP (PW) packages. The UCC15701/2 is
offered in the 14 pin CDIP (J) package.
TYPICAL APPLICATION DIAGRAM
VIN S UP P LY
VREF
R4
R5
CF
RF
R1
R2 VFF
6
R3
7 RT
VDD
CT UCC35701
10 CT
3
R6
C1
R7
9 VS CLAMP
11 S YNC
CS
14 SS
OUT 4
ILIM 2
1 COUNT
C3
12 VREF
P GND 5
R8
R10
C2
RCS
R8 RGND
8 FB
GND 13
R11
C5
R12 C6
VOUT
R13
R14
C7
R15
SLUS293C - JANUARY 2000 - REVISED JUNE 2005
C6 VOUT
C4
VIN RETURN
UDG-98005-1

UCC15702
ABSOLUTE MAXIMUM RATINGS
Supply voltage (Supply current limited to 20mA) . . . . . . . . 15V
Supply Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Input pins ( ILIM,VFF,RT,CT,VSCLAMP,SYNC,SS, FB) . . . 6V
Output Current (OUT) DC. . . . . . . . . . . . . . . . . . . . . +/–180mA
Output Current (OUT) Pulse (0.5ms) . . . . . . . . . . . . . . +/–1.2A
Storage Temperature. . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . +300°C
Note: All voltages are with respect to GND. Currents are posi-
tive into the specified terminal. Consult Packaging Section of
the Databook for thermal limitations and considerations of
packages.
CONNECTION DIAGRAMS
DIL-14, SOIC-14, TSSOP-14 (TOP VIEW)
N or J, D, PW PACKAGE
COUNT 1
ILIM 2
VDD 3
OUT 4
P GND 5
VFF 6
RT 7
14 SS
13 GND
12 VREF
11 S YNC
10 CT
9 VS CLAMP
8 FB
UCC15701/2
UCC25701/2
UCC35701/2
ORDERING INFORMATION
TA = TJ
UVLO
Option
–55°C to +125°C
13V / 9V
9.6V / 8.8V
13V / 9V
–40°C to +85°C
9.6V / 8.8V
0°C to +70°C
13V / 9V
9.6V / 8.8V
Package Part Number
CDIP-14 UCC15701J
CDIP-14 UCC15702J
SOIC-14 UCC25701D
PDIP-14 UCC25701N
TSSOP-14 UCC25701PW
SOIC-14 UCC25702D
PDIP-14 UCC25702N
TSSOP-14 UCC25702PW
SOIC-14 UCC35701D
PDIP-14 UCC35701N
TSSOP-14 UCC35701PW
SOIC-14 UCC35702D
PDIP-14 UCC35702N
TSSOP-14 UCC35702PW
The D and PW packages are available taped and reeled. Add
TR suffix to the device type (e.g., UCC35701DTR).
ELECTRICAL CHARACTERISTICS:Unless otherwise specified, VDD = 11V, RT = 60.4k, CT = 330pF, CREF = CVDD =
0.1m F, VFF = 2.0V, and no load on the outputs.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
UVLO Section
Start Threshold
(UCCX5701)
12 13 14
V
(UCCX5702)
8.8 9.6 10.4 V
Stop Threshold
(UCCX5701)
8 9 10 V
(UCCX5702)
8.0 8.8 9.6
V
Hysteresis
(UCCX5701)
34
V
(UCCX5702)
0.3 0.8
V
Supply Current
Start-up Current
IDD Active
VDD Clamp Voltage
(UCCX5701) VDD = 11V, VDD Comparator Off
(UCCX5702) VDD = 8V, VDD Comparator Off
VDD Comparator On
(UCCX5701) IDD = 10mA
13.5
130
120
0.75
14.3
200
190
1.5
15
mA
mA
mA
V
(UCCX5702) IDD = 10mA
13 13.8 15
V
VDD Clamp – Start Threshold
(UCCX5701)
1.3 V
(UCCX5702)
4.2 V
Voltage Reference
VREF
Line Regulation
Load Regulation
Short Circuit Current
VDD = 10V to 13V, IVREF = 0mA to 2mA
VDD = 10V to 13V
IVREF = 0mA to 2mA
VREF = 0V, TJ = 25°C
4.9 5 5.1 V
20 mV
2 mV
20 50 mA
2


Features application INFO available Advanced Volt age Mode Pulse Width Modulator UCC1570 1/2 UCC25701/2 UCC35701/2 FEATURES DE SCRIPTION 700kHz Operation Integrated Oscillator/ Voltage Feed Forward Compen sation Accurate Duty Cycle Limit Accura te Volt-second Clamp Optocoupler Interf ace Fault Counting Shutdown Fault Latch off or Automatic Shutdown Soft Stop Op timized for Synchronous Rectification 1 A Peak Gate Drive Output The UCC35701/ UCC35702 family of pulse width modulato rs is intended for isolated switching p ower supplies using primary side contro l. They can be used for both off-line a pplications and DC/DC converter designs such as in a distributed power system architecture or as a telecom power sour ce. The devices feature low startup cur rent, allowing for efficient off-line s tarting, yet have sufficient output dri ve to switch power MOSFETs in excess of 500kHz. Voltage feed forward compensat ion is operational over a 5:1 input ran ge and provides fast and accurate response to input voltage cha.
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