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HT-CN410DVH
IC 902, Power Switching Motor (FSDM 0265 RN)
Pin Definitions:
Pin Number
1
2
3
4
5
6, 7, 8
Pin Configuration:
Pin Name
Sense FET source terminal on primary side and internal control ground.
GND
Positive supply voltage input. Although connected to an auxiliary transformer
winding, current is supplied from pin 5 (Vstr) via an internal switch during startup
(see Internal Block Diagram section). It is not until Vcc reaches the UVLO upper
Vcc
threshold (12V) that the internal start-up switch opens and device power is
supplied via the auxiliary transformer winding.
Feedback voltage pin is the non-inverting input to PWM comparator. It has a
0.9mA current source connected internally while a capacitor and optocoupler are
typically connected externally. A feedback voltage of 6V triggers over load
protection (OLP). There is a time delay while charging between 3V and 6V using
Vfb
an internal 5uA current source, which prevents false triggering under transient
conditions but still allows the protection mechanism to operate under true
overload conditions.
Pin to adjust the current limit of the Sense FET. The feedback 0.9mA current
source is diverted to the parallel combination of an internal 2.8kΩ resistor and any
Ipk
external resistor to GND on this pin to determine the current limit. If this pin is tied
to Vcc or left floating, the typical current limit will be 1.2A.
This pin connects directly to the rectified AC line voltage source. At start up the
internal switch supplies internal bias and charges and external storage capacitor
Vstr
placed between the Vcc pin and ground. Once the Vcc reaches 12V, the internal
switch is disabled.
The Drain pin is designed to connect directly to the primary lead of the trans-
former and is capable of switching a maximum of 650V. Minimizing the length of
Drain
the trace connecting this pin to the transformer will decrease leakage inductance.
GND
Vcc
Vfb
lpk
Figure 4: PIN CONFIGURATION (TOP VIEW)
Pin Function Description
8DIP
8LSOP
1
8
Drain
2
7
Drain
3
6
Drain
5
4
Vstr
42
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