Datasheet > INN3674C-H602-TL

INN3674C-H602-TL

更新时间： 2022-09-29 19:49:56

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
30页	2447K
描述
IC OFFLINE SWITCH SR CONTROL

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INN3674C-H602-TL 数据手册

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InnoSwitch3-EP

FEEDBACK Pin Short Detection

SECONDARY BYPASS Pin Overvoltage Protection

The InnoSwitch3-EP secondary controller features a SECONDARY

BYPASS pin OV feature similar to the PRIMARY BYPASS pin OV

feature. When the secondary is in control, in the event that the

SECONDARY BYPASS pin current exceeds I_BPS(SD)(~7 mA) the

secondary will send a command to the primary to initiate an

auto-restart off-time (t_AR(OFF)).

If the sensed FEEDBACK pin voltage is below V_FB(OFF)at start-up, the

secondary controller will complete the handshake to take control of

the primary complete t_SS(RAMP)and will stop requesting cycles to initiate

auto-restart (no cycle requests made to primary for longer than t_AR(SK)

second triggers auto-restart).

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 the V_FB(OFF)threshold. The deglitch ﬁlter on the

protection mode is on for less than ~10 ms. By this mechanism, the

secondary will relinquish control after detecting that the FEEDBACK

pin is shorted to ground.

Output Constant Current and Constant Power Regulation

The InnoSwitch3-EP regulates the output current through an external

current sense resistor between the ISENSE and SECONDARY

GROUND pins and also controls output power in conjunction with the

output voltage sensed on the OUTPUT VOLTAGE pin. If constant

current regulation is not required, the ISENSE pin must be tied to the

SECONDARY GROUND pin. The InnoSwitch3-EP has constant current

regulation below the V_PKthreshold, and a constant output power

proﬁle above the V_PKthreshold. The transition between CP and CC is

set by the V_PKthreshold and the set constant current is programmed

by the resistor between the ISENSE and SECONDARY GROUND pins.

Auto-Restart Thresholds

The OUTPUT VOLTAGE pin includes a comparator to detect when the

output voltage falls below V_FB(AR)or V_VO(AR), for a duration exceeding

t_FB(AR)or t_VO(AR)respectively. The secondary controller will relinquish

control when this fault condition is detected. This threshold is meant

to limit the range of constant current (CC) operation and is included

to support high power charger applications.

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Figure 8. Intelligent Quasi-Resonant Mode Switching.

Rev. D 08/18

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