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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。 |
部品番号 | UC3861 |
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部品説明 | (UC3861 - 3868) Resonant-Mode Power Supply Controllers | ||
メーカ | Unitrode | ||
ロゴ | |||
このページの下部にプレビューとUC3861ダウンロード(pdfファイル)リンクがあります。 Total 9 pages
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 UC1861-1868
UC2861-2868
UC3861-3868
ELECTRICAL CHARACTERISTICS Unless otherwise stated, all specifications apply for –55°C≤TA≤125°C for the
UC186x, –25°C≤TA≤85°C for the UC286x, and 0°C≤TA≤70°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 UDG-92022-1
Figure 2. Error Amp, Voltage Controlled Oscillator, and One Shot
6
UDG-92023-1
6 Page | |||
ページ | 合計 : 9 ページ | ||
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PDF ダウンロード | [ UC3861 データシート.PDF ] |
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部品番号 | 部品説明 | メーカ |
UC3860 | Resonant Mode Power Supply Controller | Texas Instruments |
UC3861 | (UC3861 - 3868) Resonant-Mode Power Supply Controllers | Unitrode |
UC3861 | Resonant-Mode Power Supply Controllers (Rev. B) | Texas Instruments |
UC3862 | (UC3861 - 3868) Resonant-Mode Power Supply Controllers | Unitrode |