PI公司创新高效AC-DC芯片：INN2603-2605
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更新于2024-07-21
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"PI公司最新的AC-DC转换芯片INN2603-2605系列，属于InnoSwitch-EP家族，是一款高度集成、高效节能的离线式恒压/恒流 flyback 开关集成电路，内置MOSFET、同步整流驱动器以及反馈系统，具有创新的FluxLink™技术，实现安全隔离的反馈链接。该产品在设计上确保了出色的恒压精度，不受变压器设计或外部组件影响，并能提供卓越的多输出交叉调节能力。其内置的同步整流技术有助于提高效率，尤其是在低负载时，如在230VAC下，待机功率可低于10mW，满足全球能源效率法规。此外，该芯片具备多种先进的保护和安全特性，如初级感应的输出过电压保护、次级感应的输出电压钳位、输出过电流保护至零电压、热迟滞保护以及精确的输入电压监控，以确保棕色插入/棕色断开和过电压保护。产品完全符合安全和法规要求，100%生产hipot合规性。"
本文将深入探讨PI公司的这款最新AC-DC转换芯片INN2603-2605系列的关键特点和技术优势。
首先，高度集成是该芯片的一大亮点。它集成了flyback控制器、725V MOSFET、次级侧感应以及同步整流驱动，使得电路设计更为简洁，降低了系统成本和体积。同时，FluxLink™技术的引入，实现了隔离的反馈链接，提高了系统的安全性和稳定性。
其次，该芯片的电压控制精度非常出色，不论变压器设计如何变化或者外部组件选择不同，都能保持恒定的电压输出。这一特性对于多输出电源系统来说尤其重要，因为它能确保各输出端口间的电压稳定性，从而保证设备的正常工作。
再者，PI的这款芯片具备优异的能效表现。通过同步整流技术，它能在低负载条件下（如230VAC下的待机状态）将功耗降至10mW以下，这有助于满足日益严格的全球能效标准，如能源之星（Energy Star）、欧盟的ErP指令等。
安全和保护功能是该芯片的另一大卖点。包括初级感应的输出过电压保护，能防止过高电压对系统造成损害；次级感应的输出电压钳位，可以避免输出电压超出安全范围；输出过电流保护至零电压，能够在电流过载时及时关闭输出，保护下游电路；热迟滞保护则能预防过热情况，确保芯片在极端条件下仍能稳定工作。此外，输入电压监控功能确保了系统在电压波动时的可靠运行。
PI的INN2603-2605系列AC-DC转换芯片凭借其高度集成、高效节能、精确控制以及全面的安全保护，成为了电源设计领域的理想选择，特别适合对能效和可靠性有高要求的应用场景。
Rev. B 08/15
5
INN2603-2605
www.power.com
The most likely event that could require an additional handshake is
when the primary stops switching resulting from a momentary line
drop-out or brown-out event. When the primary resumes operation,
it will default into a start-up condition and attempt to detect hand-
shake pulses from the secondary.
In the event the secondary does not detect that the primary responds
to requests for 6 consecutive cycles, or if the secondary detects that
the primary is switching without cycle requests for 6 or more
consecutive cycles, the secondary controller will initiate a second
handshake sequence.
This protection mode also provides additional protection against
cross-conduction of the SR MOSFET while the primary is switching.
This protection mode also prevents output overvoltage in the event
the primary is reset while the secondary is still in control and light/
medium load conditions exist.
Line Voltage Monitor
The VOLTAGE MONITOR pin is used for input under and overvoltage
sensing and protection function.
A 8 MW resistor is tied between the high voltage bulk DC capacitor
after the bridge or connected through a set of diodes from the AC
side of bridge and small high-voltage capacitor and bleed resistor (for
fast AC reset) and VOLTAGE MONITOR pin to enable this function. To
disable this function the VOLTAGE MONITOR pin should be tied to the
PRIMARY BYPASS pin.
At power-up after the BPP is charged and the I
LIM
is latched, prior to
switching the state of VOLTAGE MONITOR pin current is checked to
determine that it is above brown-in (I
UV+
) And below the overvoltage
shutdown threshold (I
OV+
) To proceed with start-up.
If during normal operation the VOLTAGE MONITOR pin current falls
below the brown-out (I
UV-
) threshold and remains below brown-in
(I
UV+
) for longer than t
UV-
the controller enters into auto-restart with a
short auto-restart off-time (~200 ms). Switching will only resume
once the VOLTAGE MONITOR pin current is above the brown-in
threshold (I
UV+
) for a time period exceeding ~150 ms.
In the event during normal operation the VOLTAGE MONITOR pin
current is above the overvoltage threshold (I
OV+
) for longer than t
OV
,
the controller will enter auto-restart with a short auto-restart off-time
(~200 ms). Switching will only resume once the VOLTAGE MONITOR
pin current fall below (I
OV-
)
for a time period exceeding ~150 ms.
Secondary Controller
Once the device enters the short auto-restart OFF-time, the PRIMARY
BYPASS pin will activate an internal bleed to discharge the input bulk
capacitor. The feedback driver block is the drive to the FluxLink
communication loop transferring switching pulse requests to the
primary IC.
As shown in the block diagram in Figure 4, the secondary controller
is powered through a 4.45 V Regulator block by either VOUT or
FORWARD pin connections to the SECONDARY BYPASS pin. The
SECONDARY BYPASS pin is connected to an external decoupling
capacitor and fed internally from the regulator block.
The FORWARD pin also connects to the negative edge detection
block used for both handshaking and timing to turn on the synchro-
nous rectier MOSFET (SR FET) connected to the SYNCHRONOUS
RECTIFIER DRIVE pin. The FORWARD pin is also used to sense when
to turn off the SR FET in discontinuous mode operation when the
voltage across the FET on resistance drops below V
SR(TH)
.
In continuous mode operation the SR FET is turned off when the
pulse request is sent to demand the next switching cycle, providing
excellent synchronization free of any overlap for the FET turn-off
while operating in continuous mode.
The mid-point of an external resistor divider network between the
VOUT and SECONDARY GROUND pins is tied to the FEEDBACK pin
to regulate the output voltage. The internal voltage comparator
reference voltage is V
REF
(1.265V).
The external current sense resistor connected between IS and
SECONDARY GROUND pins is used to regulate the output current in
constant current regulator mode. The internal current sense
comparator threshold is IS
VTH
used to determine the value at which
the power supply output current is regulated.
Secondary Controller Oscillator
The typical oscillator frequency is internally set to an average
frequency of 100 kHz.
The oscillator incorporates circuitry that introduces a small amount of
frequency jitter, typically 6 kHz peak-to-peak, to minimize EMI
emission. The modulation rate of the frequency jitter is set to 1 kHz
to optimize EMI reduction for both average and quasi-peak emissions.
Output Overvoltage Protection
In the event the sensed voltage on the FEEDBACK pin is 2% higher
than the regulation threshold, a bleed current of ~10 mA is applied on
the VOUT pin. This bleed current increases to ~140 mA in the event
the FEEDBACK pin voltage is raised to beyond ~20% of the internal
FEEDBACK pin reference voltage. The current sink on the VOUT pin
is intended to discharge the output voltage for momentary overshoot
events. The secondary does not relinquish control to the primary
during this mode of operation.
FEEDBACK Pin Short Detection
In the event the FEEDBACK pin voltage is below the V
FB(OFF)
threshold
at start-up, the secondary will complete the primary/secondary hand-
shake and will stop requesting pulses to initiate an auto-restart. The
secondary will stop requesting cycles for t
AR(SK)
, to begin primary-side
auto-restart of t
AR(OFF)SH
. In this condition, the total apparent AR
off-time is t
AR(SK)
+ t
AR(OFF)SH
. During normal operation, the secondary
will stop requesting pulses from the primary to initiate an auto-restart
cycle when the FEEDBACK pin voltage falls below V
FB(OFF)
threshold.
The deglitch lter on the V
FB(OFF)
is less than 10 msec. The secondary
will relinquish control after detecting the FEEDBACK pin is shorted to
ground.
OUTPUT VOLTAGE Pin Auto-Restart Threshold
The VOUT pin also includes a comparator to detect when the output
voltage falls below the V
OUT(AR)
threshold for a duration exceeding
t
VOUT(AR)
. The secondary controller will relinquish control when it
detects the FEEDBACK pin has fallen below V
OUT(AR)
for a time duration
longer than t
VOUT(AR)
. This threshold is meant to limit the range of
constant current (CC) operation.
Output Constant-Current Regulation
The InnoSwitch-EP regulates the output current through a resistor
between the ISENSE and SECONDARY GROUND pins. If constant
current regulation is not required, this pin must be tied to the
GROUND pin
SR Disable Protection
On a cycle by cycle basis the SR is only engaged in the event a cycle
was requested by the secondary controller and the negative edge is
detected on the FORWARD pin. In the event the voltage on the
ISENSE pin exceeds approximately 3 times the IS
VTH
threshold, the SR
MOSFET drive is disabled until the surge current has diminished to
nominal levels.
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