Hitachi CG2026S, Service Manual, Page: 12 / 42

11
STV5112
BANDWIDTH : 6MHz TYPICAL
SUPPLY VOLTAGE : 220V TYPICAL
RISE AND FALL TIME : 50ns TYPICAL
CRT CATHODE CURRENT OUTPUTS FOR
PARALLEL OR SEQUENTIAL CUT-OFF OR
DRIVE ADJUSTMENT
FLASHOVER PROTECTION
POWER DISSIPATION : 3.6W
General Description:
The STV5112 includes three video amplifiers designed with a high voltage bipolar/CMOS/DMOS technology (BCD).
It drives directly the three cathodes and is protected against flashovers. Thanks to its three cathode current outputs,
the STV5112 can be used with both parallel and sequential sampling applications.
PINNING
1. BLUE INPUT
2. VCC LOW VOLTAGE
3. GREEN INPUT
4. RED INPUT
5. VDD HIGH VOLTAGE
6. RED CATHODE CURRENT
7. RED OUTPUT
8. GROUND
9. RED FEEDBACK
10. GREEN OUTPUT
11. GREEN CATHODE CURRENT
12. GREEN FEEDBACK
13. BLUE OUTPUT
14. BLUE CATHODE
15. BLUE FEEDBACK
MC44608
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
• Loss less off–line start–up
• Direct off–line operation
• Fast start–up
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
• Demagnetization (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 startup
• Low dV/dT for low EMI radiations