sales@hkmjd.com
Service Telephone:86-755-83294757
Trade Name:AC DC Converter
Brand:ST
Particular Year:23+
Package:SO-16
Delivery Date:New and Original
Stock: 5000pcs
The L6699DTR is a double-ended controller specific to series-resonant half bridge topology. Both LLC and LCC configurations are supported. It provides symmetrical complementary duty cycle: the high-side switch and the low-side switch are driven ON/OFF 180° out-of-phase for exactly the same time. Output voltage regulation Ais obtained by modulating the operating frequency. The deadtime inserted between the turn-off of one switch and the turn-on of the other one is automatically adjusted to best fit the transition times of the half bridge midpoint. To drive the high-side switch with the bootstrap approach, the IC incorporates a high voltage floating structure able to withstand more than 600 V with a synchronous-driven high voltage DMOS that replaces the external fast-recovery bootstrap diode.
The IC enables the user to set the operating frequency range of the converter by means of a high-accuracy externally programmable oscillator.
At startup, in addition to the traditional frequency-shift soft-start (the switching frequency starts from a preset maximum value and then decays as far as the steady-state value determined by the control loop), a proprietary circuit controls the half bridge to prevent hard-switching from occurring in the initial cycles because of the unbalance in the V·s applied to the transformer.
At light load the IC can be forced to enter a controlled burst-mode operation that keeps the converter input consumption as low as possible.
IC protection functions include a current sense input for OCP with frequency shift and delayed shutdown with automatic restart. Fast shutdown with automatic restart occurs if this first-level protection cannot control the primary current. Additionally, the IC prevents the converter from working in or too close to the capacitive mode, to guarantee soft-switching. A latched disable input (DIS) can be used to implement OTP and/or OVP. The combination of these protection features offers the highest degree of safety.
Other functions include a not-latched active-low disable input with current hysteresis, useful for power sequencing or for brownout protection, and an interface with the PFC controller that enables the switching-off of the pre-regulator during fault conditions or during burst-mode operation.
L6699DTR Features
Symmetrical duty cycle, variable frequency control of resonant half bridge
Self-adjusting adaptive deadtime
High-accuracy oscillator
2-level OCP: frequency-shift and immediate shutdown
Interface with PFC controller
Anti-capacitive-mode protection
Burst-mode operation at light load
Input for brownout protection or power-on/off sequencing
“Safe-start” procedure prevents hard switching at startup
600 V rail compatible high-side gate driver with integrated bootstrap diode and high dv/dt immunity
-300/800 mA high-side and low-side gate drivers with UVLO pull-down
SO16N package
L6699DTR Applications
SMPS for LCD TVs, desktop and AIO PCs, servers, Telecom power
AC-DC adapter, open frame SMPS
Model
Brand
Package
Quantity
Describe
ON
SOIC-7
7500
Fixed Frequency Current Mode Controller for Flyback Converter with HV startup
POWER
InSOP-24D
1000
Off-line converter flyback, secondary SR topology 60kHz InSOP-24D
POWER
InSOP-24D
1000
Off-line converter flyback, secondary SR topology 60kHz InSOP-24D
POWER
InSOP-24D
1000
Off-line converter flyback, secondary SR topology 80kHz InSOP-24D
POWER
InSOP-24D
1000
Off-line converter flyback, secondary SR topology 100kHz InSOP-24D
POWER
InSOP-24D
1000
Off-line converter flyback, secondary SR topology 100kHz InSOP-24D
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