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UC3861 の電気的特性と機能

UC3861のメーカーはUnitrodeです、この部品の機能は「(UC3861 - 3868) Resonant-Mode Power Supply Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC3861
部品説明 (UC3861 - 3868) Resonant-Mode Power Supply Controllers
メーカ Unitrode
ロゴ Unitrode ロゴ 




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UC3861 Datasheet, UC3861 PDF,ピン配置, 機能
www.DataSheet4U.com
Resonant-Mode Power Supply Controllers
UC1861-1868
UC2861-2868
UC3861-3868
FEATURES
DESCRIPTION
Controls Zero Current Switched (ZCS)
or Zero Voltage Switched (ZVS)
Quasi-Resonant Converters
Zero-Crossing Terminated One-Shot
Timer
Precision 1%, Soft-Started 5V
Reference
Programmable Restart Delay
Following Fault
Voltage-Controlled Oscillator (VCO)
with Programmable Minimum and
Maximum Frequencies from 10kHz to
1MHz
Low Start-Up Current (150µA typical)
Dual 1 Amp Peak FET Drivers
UVLO Option for Off-Line or DC/DC
Applications
The UC1861-1868 family of ICs is optimized for the control of Zero Cur-
rent Switched and Zero Voltage Switched quasi-resonant converters. Dif-
ferences between members of this device family result from the various
combinations of UVLO thresholds and output options. Additionally, the
one-shot pulse steering logic is configured to program either on-time for
ZCS systems (UC1865-1868), or off-time for ZVS applications (UC1861-
1864).
The primary control blocks implemented include an error amplifier to com-
pensate the overall system loop and to drive a voltage controlled oscillator
(VCO), featuring programmable minimum and maximum frequencies. Trig-
gered by the VCO, the one-shot generates pulses of a programmed maxi-
mum width, which can be modulated by the Zero Detection comparator.
This circuit facilitates “true” zero current or voltage switching over various
line, load, and temperature changes, and is also able to accommodate the
resonant components' initial tolerances.
Under-Voltage Lockout is incorporated to facilitate safe starts upon
power-up. The supply current during the under-voltage lockout period is
typically less than 150µA, and the outputs are actively forced to the low
state.
(continued)
Device
UVLO
Outputs
“Fixed”
1861
16.5/10.5
Alternating
Off Time
BLOCK DIAGRAM
1862
16.5/10.5
Parallel
Off Time
1863
36014
Alternating
Off Time
1864
36014
Parallel
Off Time
1865
16.5/10.5
Alternating
On Time
1866
16.5/10.5
Parallel
On Time
1867
36014
Alternating
On Time
1868
36014
Parallel
On Time
Pin numbers refer to the J and N packages.
10/98
UDG-92018

1 Page





UC3861 pdf, ピン配列
UC1861-1868
UC2861-2868
UC3861-3868
ELECTRICAL CHARACTERISTICS Unless otherwise stated, all specifications apply for –55°CTA125°C for the
UC186x, –25°CTA85°C for the UC286x, and 0°CTA70°C for the UC386x, VCC=12V, CVCO=1nF, Range=7.15k, RMIN=86.6k,
C=200pF, R=4.02k, and Csr=0.1µF. TA=TJ .
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
5V Generator
Output Voltage
12V Vcc 20V, –10mA IO 0mA
4.8 5.0 5.2 V
Short Circuit Current
VO = 0V
–150
–15 mA
Soft-Reference
Restart Delay Current
V = 2V
10 20 35 µA
Soft Start Current
V = 2V
–650 –500 –350 µA
Reference Voltage
TJ = 25°C, IO = 0A
4.95 5.00 5.05 V
12V VCC 20V, –200µA IO 200µA
4.85 5.15 V
Line Regulation
12V VCC 20V
2 20 mV
Load Regulation
–200µA IO 200µA
10 30 mV
Error Amplifier (Note 3)
Input Offset Voltage
VCM = 5V, Vo = 2V, IO = 0A
–10 10 mV
Input Bias Current
VCM = 0V
–2.0 –0.3
µA
Voltage Gain
Vcm = 5V, 0.5V VO 3.7V, IO = 0A
70 100
dB
Power Supply Rejection Ratio
Vcm = 5V, VO = 2V, 12V VCC 20V
70 100
dB
Error Amplifier (Note 3) (cont.)
Common Mode Rejection Ratio 0V Vcm 6V, VO = 2V
65 100
dB
VOUT Low
VID = –100mV, IO = 200µA
0.17 0.25 V
VOUT High
VID = 100mV, IO = –200µA
3.9 4.2
V
Unity Gain Bandwidth
(Note 4)
0.5 0.8
MHz
Voltage Controlled Oscillator
Maximum Frequency
VID (Error Amp) = 100mV, TJ = 25°C
450 500 550 kHz
VID (Error Amp) = 100mV
425 575 kHz
Minimum Frequency
VID (Error Amp) = –100mV, TJ = 25°C
45 50 55 kHz
VID (Error Amp) = –100mV
42 58 kHz
One Shot
Zero Comparator Vth
0.45 0.50 0.55 V
Propagation Delay
(Note 4)
120 200 ns
Maximum Pulse Width
VZERO = 1V
850 1000 1150 ns
Maximum to Minimum Pulse
VZERO = 0V UCx861 – UCx864
2.5 4 5.5
Width Ratio
VZERO = 0V UCx865 – UCx868. –55°C to +85°C
4 5.5 7
VZERO = 0V UCx865 – UCx868, +125°C
3.8 5.5
7
Output Stage
Rise and Fall Time
CLOAD = 1nF (Note 4)
25 45 ns
Output Low Saturation
IO = 20mA
0.2 0.5 V
IO = 200mA
0.5 2.2 V
Output High Saturation
IO = –200mA, down from Vcc
1.7 2.5 V
UVLO Low Saturation
IO = 20mA
0.8 1.5 V
Fault Comparator
Fault Comparator Vth
2.85 3.00 3.15 V
Delay to Output
(Note 4) (Note 5)
100 200 ns
3


3Pages


UC3861 電子部品, 半導体
UDG-92022-1
Figure 2. Error Amp, Voltage Controlled Oscillator, and One Shot
6
UDG-92023-1

6 Page



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共有リンク

Link :


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