Refer to the PDF data sheet for device specific package drawings
The UCC3813-x device family of high-speed, low-power integrated circuits contains all of the control and drive components required for off-line and DC-to-DC fixed-frequency current-mode switching power supplies with minimal parts count.
These devices have the same pin configuration as the UC384x device family, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input.
The UCC3813-x device family offers a variety of package options, temperature-range options, choice of maximum duty cycle, and choice of critical voltage levels. Devices with lower reference voltage such as the UCC3813-3 and UCC3813-5 fit best into battery operated systems, while the higher reference and the higher UVLO hysteresis of the UCC3813-2 device and UCC3813-4 device make these ideal choices for use in off-line power supplies.
The UCC2813-x device series is specified for operation from –40°C to 85°C and the UCC3813-x device series is specified for operation from 0°C to 70°C.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
UCC2813-x,
UCC3813-x |
PDIP (8) | 6.35 mm × 9.81 mm |
SOIC (8) | 3.91 mm × 4.90 mm | |
TSSOP (8) | 4.40 mm × 3.00 mm |
Changes from E Revision (August, 2016) to F Revision
Changes from D Revision (May 2013) to E Revision
Changes from C Revision (August 2010) to D Revision
Changes from B Revision (April 2008) to C Revision
PART NUMBER(1) | MAXIMUM DUTY CYCLE | REFERENCE VOLTAGE | TURNON THRESHOLD | TURNOFF THRESHOLD | UNIT |
---|---|---|---|---|---|
UCCx813-0 | 100% | 5 | 7.2 | 6.9 | V |
UCCx813-1 | 50% | 5 | 9.4 | 7.4 | V |
UCCx813-2 | 100% | 5 | 12.5 | 8.3 | V |
UCCx813-3 | 100% | 4 | 4.1 | 3.6 | V |
UCCx813-4 | 50% | 5 | 12.5 | 8.3 | V |
UCCx813-5 | 50% | 4 | 4.1 | 3.6 | V |
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
COMP | 1 | O | COMP is the output of the error amplifier and the input of the PWM comparator. Feedback loop compensation is applied between this pin and the FB pin. |
CS | 3 | I | CS is the input to the current-sense comparators: the PWM comparator and the overcurrent comparator. |
FB | 2 | I | FB is the inverting input of the error amplifier. |
GND | 5 | — | GND is the reference ground and power ground for all functions of this device. |
OUT | 6 | O | OUT is the output of a high-current power driver capable of driving the gate of a power MOSFET. |
RC | 4 | I | RC is the oscillator timing programming pin. An external resistor and capacitor are applied to this input to program the switching frequency and maximum duty-cycle. |
REF | 8 | O | REF is the voltage reference for the error amplifier and many other functions, and is the bias source for logic functions of this device. |
VCC | 7 | I | VCC is the bias-power input for this device. In normal operation, VCC is connected to a voltage source through a current-limiting resistor. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
VCC voltage(3) | 12 | V | ||
VCC current | 30 | mA | ||
OUT current | ±1 | A | ||
OUT energy (capacitive load) | 20 | µJ | ||
Analog inputs | FB, CS, RC, COMP | –0.3 | 6.3 or
VVCC + 0.3(4) |
V |
Power dissipation at TA < 25°C | N package | 1 | W | |
D package | 0.65 | |||
Lead temperature, soldering (10 s) | 300 | °C | ||
Junction temperature | –55 | 150 | °C | |
Storage temperature, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2500 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±1500 |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VVCC | VCC bias supply voltage from a low impedance source | 11 | V | ||
IVCC | Supply bias current | 25 | mA | ||
VOUT | Gate driver output voltage | –0.1 | VVCC | V | |
IOUT | Average OUT pin current | 20 | mA | ||
IREF | REF pin output current | 5 | mA | ||
Voltage on analog pins | FB, CS, RC, COMP | –0.1 | 6 or VVCC(1) | V | |
fOSC | Oscillator frequency | 1 | MHz |
THERMAL METRIC(1) | UCCx813-x | UNIT | |||
---|---|---|---|---|---|
P (PDIP) | D (SOIC) | PW (TSSOP) | |||
8 PINS | 8 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 50.9 | 107.5 | 153.8 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 40.3 | 49.3 | 38.4 | °C/W |
RθJB | Junction-to-board thermal resistance | 28.1 | 48.7 | 83.8 | °C/W |
ψJT | Junction-to-top characterization parameter | 17.6 | 6.6 | 2.2 | °C/W |
ψJB | Junction-to-board characterization parameter | 28 | 48 | 82 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
REFERENCE | ||||||
Output voltage | TJ = 25°C, I = 0.2 mA, UCCx813-[0,1,2,4] | 4.925 | 5 | 5.075 | V | |
TJ = 25°C, I = 0.2 mA, UCCx813-[3,5] | 3.94 | 4 | 4.06 | |||
Load regulation | 0.2 mA < I < 5 mA | 10 | 30 | mV | ||
Total variation | UCCx813-[0,1,2,4](5) | 4.84 | 5 | 5.1 | V | |
UCCx813-[3,5](5) | 3.84 | 4 | 4.08 | |||
Output noise voltage | 10 Hz ≤ f ≤ 10 kHz, TJ = 25°C(7) | 70 | µV | |||
Long term stability | TA = 125°C, 1000 hours(7) | 5 | mV | |||
Output short circuit | –5 | –35 | mA | |||
OSCILLATOR | ||||||
Oscillator frequency | UCCx813-[0,1,2,4](2) | 40 | 46 | 52 | kHz | |
UCCx813-[3,5](2) | 26 | 31 | 36 | |||
Temperature stability | See note (7) | 2.5% | ||||
Amplitude peak-to-peak | 2.25 | 2.4 | 2.55 | V | ||
Oscillator peak voltage | 2.45 | V | ||||
ERROR AMPLIFIER | ||||||
Input voltage | VCOMP = 2.5 V; UCCx813-[0,1,2,4] | 2.42 | 2.5 | 2.56 | V | |
VCOMP = 2 V; UCCx813-[3,5] | 1.92 | 2 | 2.05 | |||
Input bias current | –2 | 2 | µA | |||
Open loop voltage gain | 60 | 80 | dB | |||
COMP sink current | VFB = 2.7 V, VCOMP = 1.1 V | 0.4 | 2.5 | mA | ||
COMP source current | VFB = 1.8 V, VCOMP = VREF – 1.2 V | –0.2 | –0.5 | –0.8 | mA | |
Gain-bandwidth product | See note (7) | 2 | MHz | |||
PWM | ||||||
Maximum duty cycle | UCCx813-[0,2,3] | 97% | 99% | 100% | ||
UCCx813-[1,4,5] | 48% | 49% | 50% | |||
Minimum duty cycle | VCOMP = 0 V | 0% | ||||
CURRENT SENSE | ||||||
Gain | See note (3) | 1.1 | 1.65 | 1.8 | V/V | |
Maximum input signal | VCOMP = 5 V(4) | 0.9 | 1 | 1.1 | V | |
Input bias current | –200 | 200 | nA | |||
CS blank time | 50 | 100 | 150 | ns | ||
Overcurrent threshold | 1.32 | 1.55 | 1.7 | V | ||
COMP to CS offset | VCS = 0 V | 0.45 | 0.9 | 1.35 | V | |
OUTPUT | ||||||
OUT low level | I = 20 mA, all parts | 0.1 | 0.4 | V | ||
I = 200 mA, all parts | 0.35 | 0.9 | ||||
I = 50 mA, VVCC = 5 V, UCCx813-[3,5] | 0.15 | 0.4 | ||||
I = 20 mA, VCC = 0 V, all parts | 0.7 | 1.2 | ||||
VVCC – OUT | OUT high Vsat | I = –20 mA, all parts | 0.15 | 0.4 | V | |
I = –200 mA, all parts | 1 | 1.9 | ||||
I = –50 mA, VVCC = 5 V, UCCx813-[3,5] | 0.4 | 0.9 | ||||
Rise time | CL = 1 nF | 41 | 70 | ns | ||
Fall time | CL = 1 nF | 44 | 75 | ns | ||
UNDERVOLTAGE LOCKOUT | ||||||
Start threshold (6) | UCCx813-0 | 6.6 | 7.2 | 7.8 | V | |
UCCx813-1 | 8.6 | 9.4 | 10.2 | |||
UCCx813-[2,4] | 11.5 | 12.5 | 13.5 | |||
UCCx813-[3,5] | 3.7 | 4.1 | 4.5 | |||
Stop threshold (6) | UCCx813-0 | 6.3 | 6.9 | 7.5 | V | |
UCCx813-1 | 6.8 | 7.4 | 8 | |||
UCCx813-[2,4] | 7.6 | 8.3 | 9 | |||
UCCx813-[3,5] | 3.2 | 3.6 | 4 | |||
Start to stop hysteresis | UCCx813-0 | 0.12 | 0.3 | 0.48 | V | |
UCCx813-1 | 1.6 | 2 | 2.4 | |||
UCCx813-[2,4] | 3.5 | 4.2 | 5.1 | |||
UCCx813-[3,5] | 0.2 | 0.5 | 0.8 | |||
SOFT START | ||||||
COMP rise time | VFB = 1.8 V, Rise from 0.5 V to REF – 1 V | 4 | ms | |||
OVERALL | ||||||
Start-up current | VVCC < start threshold | 0.1 | 0.23 | mA | ||
Operating supply current | VFB = 0 V, VCS = 0 V, VRC = 0 V | 0.5 | 1.2 | mA | ||
VCC internal Zener voltage(6) | ICC = 10 mA | 12 | 13.5 | 15 | V | |
VCC internal Zener voltage minus start-threshold voltage (6) | UCCx813-[2,4] | 0.5 | 1 | V |
The UCCx813-x family of high-speed, low-power integrated circuits contain all of the control and drive functions required for off-line and DC-to-DC fixed-frequency current-mode switched-mode power supplies having minimal external parts count. The UCCx813-x family is a cost-reduced version of the UCCx80x family, with some relaxation of certain parameter limits. See Differences Between the UCC3813 and UCC3800 PWM Families for more information.
These devices have the same pin configuration as the UCx84x and UCx84xA families, and also offer the added features of internal full-cycle soft start and internal leading-edge blanking of the current-sense input. The UCCx813-x devices are pin-out compatible with the UCx84x and UCx84xA families, however they are not plug-in compatible. In general, the UCCx813-x requires fewer external components and consumes less operating current.
The UCCx813-x family offers numerous advantages that allow the power supply design engineer to meet their challenging requirements.
Features include:
COMP is the output of the error amplifier and the input of the PWM comparator. Unlike earlier-generation devices, the error amplifier in the UCCx813-x device family is a true low-output-impedance 2-MHz operational amplifier. As such, the COMP terminal both sources and sinks current. However, the error amplifier is internally current limited, so zero duty cycle may be commanded by externally forcing COMP to GND.
The UCCx813-x device family features built-in full cycle soft start at power up and after fault recovery, and no external components are necessary. Soft start is implemented as a rising clamp on the COMP voltage, increasing from 0 V to 5 V in 4 ms.