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| 型号： | RDK-242 |
| 厂商： | Power Integrations |
| 文件页数： | 4/40页 |
| 文件大小： | 0K |
| 描述： | KIT REF DESIGN VG TOPSWITCH-JX |
| 标准包装： | 1 |
| 系列： | TOPSwitch®-JX |
| 主要目的： | AC/DC，主面和辅面 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 30W |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 85 ~ 264VAC |
| 稳压器拓扑结构： | 回扫 |
| 频率 - 开关： | 132kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TOP266VG |
| 其它名称： | 596-1312 |
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TOP264-271
+
R LS
4 M ?
V UV = I UV × R LS + V V (I V = I UV )
V OV = I OV × R LS + V V (I V = I OV )
For R LS = 4 M ?
V UV = 102.8 VDC
V OV = 451 VDC
78
Auto-Restart
Slope = PWM Gain
DC
Input
Voltage
D
S
V
CONTROL
X
DC MAX @100 VDC = 76%
DC MAX @375 VD C = 41%
C
For R IL = 12 k ?
I LIMIT = 61%
-
R IL
12 k ?
See Figure 37 for
other resistor values
(R IL ) to select different
I LIMIT values.
CONTROL
Current
Figure 5.
Package Line Sense and Externally Set Current Limit.
100
TOP264-271 Functional Description
Like TOPSwitch-HX, TOP264-271 is an integrated switched
mode power supply chip that converts a current at the control
input to a duty cycle at the open drain output of a high-voltage
55
25
power MOSFET. During normal operation the duty cycle of the
power MOSFET decreases linearly with increasing CONTROL
pin current as shown in Figure 6.
Full Frequency Mode
CONTROL
Current
In addition to the three terminal TOPSwitch features, such as
the high-voltage start-up, the cycle-by-cycle current limiting,
loop compensation circuitry, auto-restart and thermal shut-
down, the TOP264-271 incorporates many additional functions
that reduce system cost, increase power supply performance
and design flexibility. A patented high-voltage CMOS technology
allows both the high-voltage power MOSFET and all the low
voltage control circuitry to be cost effectively integrated onto a
132
66
30
Jitter
Variable
Frequency
Mode
Low
Frequency
Mode
Multi-Cycle
Modulation
single monolithic chip.
I C03 I COFF CONTROL
Three terminals, FREQUENCY, VOLTAGE-MONITOR, and
EXTERNAL CURRENT LIMIT have been used to implement
I CD1 I B
I C01
I C02
Current
PI-5665-110609
some of the new functions. These terminals can be connected
to the SOURCE pin to operate the TOP264-271 in a TOPSwitch-
Figure 6.
Control Pin Characteristics (Multi-Mode Operation).
like three terminal mode. However, even in this three terminal
mode, the TOP264-271 offers many transparent features that do
not require any external components:
1. A fully integrated 17 ms soft-start significantly reduces or
eliminates output overshoot in most applications by sweeping
both current limit and frequency from low to high to limit the
peak currents and voltages during start-up.
2. A maximum duty cycle (DC MAX ) of 78% allows smaller input
storage capacitor, lower input voltage requirement and/or
higher power capability.
3. Multi-mode operation optimizes and improves the power
supply efficiency over the entire load range while maintaining
good cross regulation in multi-output supplies.
4. Switching frequency of 132 kHz reduces the transformer size
with no noticeable impact on EMI.
5. Frequency jittering reduces EMI in the full frequency mode at
high load condition.
4
Rev. E 08/12
6. Hysteretic over-temperature shutdown ensures thermal fault
protection.
7. Packages with omitted pins and lead forming provide large
drain creepage distance.
8. Reduction of the auto-restart duty cycle and frequency to
improve the protection of the power supply and load during
open loop fault, short-circuit, or loss of regulation.
9. Tighter tolerances on I 2 f power coefficient, current limit
reduction, PWM gain and thermal shutdown threshold.
The VOLTAGE-MONITOR (V) pin is usually used for line sensing
by connecting a 4 M W resistor from this pin to the rectified DC
high-voltage bus to implement line overvoltage (OV), under-
voltage (UV) and dual-slope line feed-forward with DC MAX
reduction. In this mode, the value of the resistor determines the
OV/UV thresholds and the DC MAX is reduced linearly with a dual
slope to improve line ripple rejection. In addition, it also
provides another threshold to implement the latched and
www.powerint.com
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