6. Supply voltage
:200VDC
7. Cathode output 3
:20mA, 100Vpp
8. Cathode output 2
:20mA, 100Vpp
9. Cathode output 1
:20mA, 100Vpp
16.6.
74 HCT 32
The 74HC/HCT32 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky
TTL (LSTTL). They are specified in compliance with JEDEC. The 74HC/HCT32 provide the 2-input OR
function.
16.6.1.
PINNING
1, 4, 9, 12
: 1A to 4A data inputs
2, 5, 10, 13
: 1B to 4B data inputs
3, 6, 8, 11
: 1Y to 4Y data outputs
7
: GND ground (0 V)
14
: V
CC
positive supply voltage
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
? ? 1.5 V
16.7.
MC44608
16.7.1.
General description:
The MC44608 is a high performance voltage mode controller designed for off–line converters. This
high voltage circuit that integrates the start–up current source and the oscillator capacitor, requires few
external components while offering a high flexibility and reliability.
The device also features a very high efficiency stand–by management consisting of an effective Pulsed Mode
operation. This technique enables the reduction of the stand–by power consumption to approximately 1W while
delivering 300mW in a 150W SMPS.
• Integrated start–up current source
• Lossless off–line start–up
• Direct off–line operation
• Fast start–up
16.7.2.
General Features
• Flexibility
• Duty cycle control
• On chip oscillator switching frequency 40, or 75kHz
• Secondary control with few external components
Protections
• Maximum duty cycle limitation
• Cycle by cycle current limitation
• Demagnetisation (Zero current detection) protection
• “Over V CC protection” against open loop
• Programmable low inertia over voltage protection against open loop
• Internal thermal protection
GreenLine
Controller
• Pulsed mode techniques for a very high efficiency low power mode
• Lossless start-up
• Low dV/dT for low EMI radiation's
PINNING
PIN VALUE
1. Demagnetisation
Zero cross detection voltage: 50 mV typ.
2. I Sense
Over current protection voltage 1V typ.
