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Advanced Voltage Mode Pulse Width Modulator
FEATURES
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
•
• 130µA Start-up Current
• 750µA Operating Current
TYPICAL APPLICATION DIAGRAM
DESCRIPTION
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.
Two UVLO options are offered. UCC35701 family has turn-on and turn-off
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.
application
INFO
available
UCC15701/2
UCC25701/2
UCC35701/2
-
-
VREF
CF
R
F
R4
R5
R2
C3
R3
R1
CT
CS
R8
VFF
6
7RT
UCC35701
10 CT
9 VSCLAMP
11 SYNC
14 SS
1 COUNT
12 VREF
8FB
R12
C5
C6
VINSUPPLY
R6
3VDD
C1
R8
4OUT
R10
2ILIM
C2
5PGND
RGND
13GND
R11
R13
R14
C7
R15
RCS
R7
V
C6
OUT
V
OUT
V
IN
C4
RETURN
SLUS293A - JANUARY 2000
UDG-98005-1
ABSOLUTE MAXIMUM RATINGS
Supply voltage (Supply current limited to 20mA) . . . . . . . . 15V
Supply Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Input pins ( ILIM,VFF,RT,CT,VSCLAMP,SYNC,SS) . . . . . . 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
SS
COUNT
ILIM
1
2
14
GND
13
UCC15701/2
UCC25701/2
UCC35701/2
ORDERING INFORMATION
TA=T
J
–55°C to +125°C
–40°C to +85°C
-
0°C to +70°C
The D and PW packages are available taped and reeled. Add
TR suffix to the device type (e.g., UCC35701DTR).
UVLO
Package Part Number
Option
13V / 9V CDIP-14 UCC15701J
9.6V / 8.8V CDIP-14 UCC15702J
SOIC-14 UCC25701D
13V / 9V
PDIP-14 UCC25701N
TSSOP-14 UCC25701PW
SOIC-14 UCC25702D
9.6V / 8.8V
PDIP-14 UCC25702N
TSSOP-14 UCC25702PW
SOIC-14 UCC35701D
13V / 9V
PDIP-14 UCC35701N
TSSOP-14 UCC35701PW
SOIC-14 UCC35702D
9.6V / 8.8V
PDIP-14 UCC35702N
TSSOP-14 UCC35702PW
VREF
VDD
3
OUT
4
PGND
5
6
VFF
7
RT
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, V
12
11
10
9
8
SYNC
CT
VSCLAMP
FB
= 11V, RT = 60.4k, CT= 330pF, C
DD
REF=CVDD
0.1 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) 3 4 V
(UCCX5702) 0.3 0.8 V
Supply Current
Start-up Current (UCCX5701) V
(UCCX5702) V
I
Active VDDComparator On 0.75 1.5 mA
DD
Clamp Voltage (UCCX5701) IDD= 10mA 13.5 14.3 15 V
V
DD
(UCCX5702) I
Clamp – Start Threshold (UCCX5701) 1.3 V
V
DD
= 11V, VDDComparator Off 130 200 µA
DD
= 8V, VDDComparator Off 120 190 A
DD
= 10mA 13 13.8 15 V
DD
(UCCX5702) 4.2 V
Voltage Reference
V
REF
Line Regulation V
Load Regulation I
Short Circuit Current V
VDD= 10V to 13V, I
= 10V to 13V 20 mV
DD
= 0mA to 2mA 2 mV
VREF
= 0V, TJ = 25°C 20 50 mA
REF
= 0mA to 2mA 4.9 5 5.1 V
VREF
2
=
UCC15701/2
UCC25701/2
UCC35701/2
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, VDD= 11V, RT = 60.4k, CT= 330pF, C
REF=CVDD
=
0.1 F, VFF= 2.0V, and no load on the outputs.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Line Sense
Vth High Line Comparator 3.9 4 4.1 V
Vth Low Line Comparator 0.5 0.6 0.7 V
Input Bias Current –100 100 nA
Oscillator Section
Frequency V
Frequency V
= 0.8V to 3.2V 90 100 110 kHz
FF
= 0.6V to 3.4V (Note 1) 90 100 110 kHz
FF
SYNC VIH 2V
SYNC VIL 0.8 V
SYNC Input Current VSYNC = 2.0V 3 10 µA
RT Voltage VFF = 0.4V 0.5 0.6 0.7 V
VFF = 0.8V 0.75 0.8 0.85 V
VFF = 2.0V 1.95 2.0 2.05 V
VFF = 3.2V 3.15 3.2 3.25 V
VFF = 3.6V 3.3 3.4 3.5 V
Peak Voltage VFF = 0.8V (Note 1) 0.8 V
C
T
VFF = 3.2V (Note 1) 3.2 V
C
Valley Voltage (Note 1) 0 V
T
Soft Start/Shutdown/Duty Cycle Control Section
Charging Current 10 18 30 A
I
SS
Discharging Current 300 500 750 µA
I
SS
Saturation V
= 11V, IC Off 25 100 mV
DD
Fault Counter Section
Threshold Voltage VFF = 0.8V to 3.2V 3.8 4 4.2 V
Saturation Voltage VFF = 0.8V to 3.2V 100 mV
Count Charging Current 10 18 30 µA
Current Limit Section
Input Bias Current –100 0 100 nA
Current Limit Threshold 180 200 220 mV
Shutdown Threshold 500 600 700 mV
Pulse Width Modulator Section
FB Pin Input Impedance VFB = 3V 30 50 100 k
Minimum Duty Cycle VFB <= 1V 0 %
Maximum Duty Cycle VFB >= 4.5V, VSCLAMP >= 2.0V 95 99 100 %
PWM Gain VFF = 0.8V 35 50 70 %/V
Volt Second Clamp Section
Maximum Duty Cycle VFF = 0.8V, VSCLAMP = 0.6V 69 74 79 %
Minimum Duty Cycle VFF = 3.2V, VSCLAMP = 0.6V 17 19 21 %
Output Section
VOH I
VOL I
Rise Time C
Fall Time C
= –100mA, (VDD–V
OUT
= 100mA 0.4 1 V
OUT
= 1000pF 20 100 ns
LOAD
= 1000pF 20 100 ns
LOAD
) 0.4 1 V
OUT
Note 1: Guaranteed by design. Not 100% tested in production.
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