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參數(shù)資料
| 型號(hào)： | SGP100 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Primary-side-control PWM Controller |
| 中文描述： | 一次側(cè)控制PWM控制器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 501K |
| 代理商： | SGP100 |
Product Specification
Primary-side-control PWM Controller
SGP100
System General Corp.
Version 1.1.1 (IAO33.0042.B1)
- 10 -
www.sg.com.tw www.fairchildsemi.com
September 26, 2007
OPERATION DESCRIPTION
The patented topology of SGP100 enables simplified
circuit design for battery charger applications. Without
secondary feedback circuitry, the CV and CC control can
be achieved accurately. As shown in Figure 2, with the
frequency-hopping PWM operation, EMI problem can be
solved using minimized filter components. SGP100 also
provides many protection functions. The VDD pin is
equipped with over-voltage protection and under-voltage
lockout. Pulse-by-pulse current limiting and CC control
ensure over-current protection at heavy loads. The GATE
output is clamped at 18V to protect the external MOSFET
from
over-voltage
damage.
over-temperature protection shuts down the controller
with latch when over heated.
Also,
the
internal
Gate Signal
+/- 2.6KHz
44.6KHz
Frequency Hopping Period
3mS
→
39.4KHz
Figure 2. Frequency Hopping
Start-up Current
The start-up current is only 10μA. Low start-up current
allows a start-up resistor with high resistance and
low-wattage to supply the start-up power for the
controller. A 1.5M
,
0.25W start-up resistor and a
10μF/25V V
DD
hold-up capacitor are sufficient for an
AC-to-DC power adapter with a wide input range (90V
AC
to 264V
AC
).
Operating Current
The operating current has been reduced to 6.5mA. The
low operating current results in higher efficiency and
reduces the V
DD
hold-up capacitance requirement.
Green-Mode Operation
Figure 3 shows the characteristics of the PWM frequency
vs. the output voltage of the error amplifier (
V
COMV
). The
SGP100 uses the positive, proportional, output load
parameter (
V
COMV
) as an indication of the output load for
modulating the PWM frequency. In heavy load conditions,
the PWM frequency is fixed at 42KHz. Once
V
COMV
is
lower than V
N
, the PWM frequency starts to linearly
decrease from 42KHz to 500Hz (0.55V), providing
further power savings and meeting international power
conservation requirements.
COMV
V
Frequency
1KHz
500Hz
G
V
N
V
40KHz
42KHz
Figure 3. Green-Mode Operation Frequency vs. V
COMV
Constant Voltage (CV) and
Constant Current (CC) Operation
An innovative technique of the SGP100 can accurately
achieve CV/CC characteristic output without secondary
side voltage or current-feedback circuitry. There is a
feedback signal for CV/CC operation from the reflected
voltage across the primary auxiliary winding. This
voltage signal is proportional to secondary winding, so it
provides controller the feedback signal from secondary
side
and
achieves
constant-voltage
constant-current output, this voltage signal is detected and
examined by the precise constant current regulation
controller, which determines the on-time of the MOSFET
to control input power and provide constant-current
output. With feedback voltage V
CS
across the
current-sense resistor, the controller can obtain the input
power of power supply. Therefore, the region of constant
current output operation can be adjusted by a
current-sense resistor.
output.
In
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| SGP100SZ | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Primary-side-control PWM controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SGP101SZ | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| SGP10N60 | 功能描述:IGBT 晶體管 FAST IGBT NPT TECH 600V 10A RoHS:否 制造商:Fairchild Semiconductor 配置: 集電極—發(fā)射極最大電壓 VCEO:650 V 集電極—射極飽和電壓:2.3 V 柵極/發(fā)射極最大電壓:20 V 在25 C的連續(xù)集電極電流:150 A 柵極—射極漏泄電流:400 nA 功率耗散:187 W 最大工作溫度: 封裝 / 箱體:TO-247 封裝:Tube |
| SGP10N60 | 制造商:Infineon Technologies AG 功能描述:IGBT TO-220 |
| SGP10N60A | 功能描述:IGBT 晶體管 FAST IGBT NPT TECH 600V 10A RoHS:否 制造商:Fairchild Semiconductor 配置: 集電極—發(fā)射極最大電壓 VCEO:650 V 集電極—射極飽和電壓:2.3 V 柵極/發(fā)射極最大電壓:20 V 在25 C的連續(xù)集電極電流:150 A 柵極—射極漏泄電流:400 nA 功率耗散:187 W 最大工作溫度: 封裝 / 箱體:TO-247 封裝:Tube |
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