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UCC2808-2 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 UCC2808-2
기능 Low Power Current Mode Push-Pull PWM
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UCC2808-2 데이터시트, 핀배열, 회로
Low Power Current Mode Push-Pull PWM
UCC1808-1/-2
UCC2808-1/-2
UCC3808-1/-2
PRELIMINARY
FEATURES
130µA Typical Starting
Current
1mA Typical Run Current
Operation to 1MHz
Internal Soft Start
On Chip Error Amplifier With
2MHz Gain Bandwidth Product
On Chip VDD Clamping
Dual Output Drive Stages In
Push-Pull Configuration
Output Drive Stages Capable
Of 500mA Peak Source
Current, 1A Peak Sink Current
BLOCK DIAGRAM
DESCRIPTION
The UCC3808 is a family of BiCMOS push-pull, high-speed, low power, pulse
width modulators. The UCC3808 contains all of the control and drive circuitry re-
quired for off-line or DC-to-DC fixed frequency current-mode switching power
supplies with minimal external parts count.
The UCC3808 dual output drive stages are arranged in a push-pull configura-
tion. Both outputs switch at half the oscillator frequency using a toggle flip-flop.
The dead time between the two outputs is typically 60ns to 200ns depending on
the values of the timing capacitor and resistors, thus limits each output stage
duty cycle to less than 50%.
The UCC3808 family offers a variety of package options temperature range op-
tions, and choice of undervoltage lockout levels. The family has UVLO thresh-
olds and hysteresis options for off-line and battery powered systems.
Thresholds are shown in the table below.
Part Number
UCCx808-1
UCCx808-2
Turn on Threshold
12.5V
4.3V
Turn off Threshold
8.3V
4.1V
9/97
UDG-97008




UCC2808-2 pdf, 반도체, 판매, 대치품
PIN DESCRIPTION (cont.)
where frequency is in Hertz, resistance in Ohms, and ca-
pacitance in Farads. The recommended range of timing
resistors is between 10kand 200kand range of timing
capacitors is between 100pF and 1000pF. Timing resis-
tors less than 10kmust never be used.
For best performance, keep the timing capacitor lead to
GND as short as possible, the timing resistor lead from
VDD as short as possible, and the leads between timing
components and RC as short as possible. Separate
ground and VDD traces to the external timing network are
encouraged.
VDD: The power input connection for this device. Al-
UCC1808-1/-2
UCC2808-1/-2
UCC3808-1/-2
though quiescent VDD current is very low, total supply
current will be higher, depending on OUTA and OUTB
current, and the programmed oscillator frequency. Total
VDD current is the sum of quiescent VDD current and the
average OUT current. Knowing the operating frequency
and the MOSFET gate charge (Qg), average OUT cur-
rent can be calculated from
IOUT = Qg F, where F is frequency.
To prevent noise problems, bypass VDD to GND with a
ceramic capacitor as close to the chip as possible along
with an electrolytic capacitor.
Figure 2. Typical Application Diagram
UNITRODE CORPORATION
7 CONTINENTAL BLVD. MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
4
UDG-97010-1

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링크공유

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관련 데이터시트

부품번호상세설명 및 기능제조사
UCC2808-1

Low Power Current Mode Push-Pull PWM

Unitrode
Unitrode
UCC2808-1

Low Power Current Mode Push-Pull PWM

Texas Instruments
Texas Instruments

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