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L6591-L6591TR
Current mode PWM controller for Asymmetrical Half Bridge converter topology
August 2012 Doc ID 14821 Rev 6 1/41
L6591PWM controller for ZVS half bridge
Datasheet − production data
Features Complementary PWM control for soft-switched
half bridge with programmable deadtime Up to 500 kHz operating frequency Onboard high-voltage startup Advanced light load management Adaptive UVLO Pulse-by-pulse OCP OLP (latched or autorestart) Transformer saturation detection Interface with PFC controller Latched disable input Input for power-on sequencing or brownout
protection Programmable soft-start 4% precision external reference 600 V-rail compatible high-side gate driver with
integrated bootstrap diode and high dV/dt
immunity SO16N package
Applications High power AC-DC adapter/charger Desktop PC, entry-level server Telecom SMPS
16
Figure 1. Block diagram
Contents L65912/41 Doc ID 14821 Rev 6
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.1 High-voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Operation at no load or very light load . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3 PWM control block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.4 PWM comparator, PWM latch and hiccup mode OCP . . . . . . . . . . . . . . . 26
6.5 Latched shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.6 Oscillator and deadtime programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.7 Adaptive UVLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
6.8 Line sensing function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.9 Soft-start and delayed latched shutdown upon overcurrent . . . . . . . . . . . 32
Summary of L6591 power management functions . . . . . . . . . . . . . . . 34 ECOPACK ® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
L6591 Description
Doc ID 14821 Rev 6 3/41
1 Description
The L6591 is a double-ended PWM controller specific to the soft-switched half bridge
topology. It provides complementary PWM control, where the high-side switch is driven ON
for a duty cycle D and the low-side switch for a duty cycle 1-D, with D < 50%. An externally
programmable deadtime inserted between the turn-off of one switch and the turn-on of the
other one guarantees soft-switching and enables high-frequency operation.
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 of the converter by means of an
externally programmable oscillator: the maximum duty cycle is digitally clipped at 50% by a
T-flip-flop, so that the operating frequency is half that of the oscillator.
At very light load the IC enters a controlled burst mode operation that, along with the built-in
non-dissipative high-voltage startup circuit and the low quiescent current, helps keep the
consumption from the mains low and is compliant with energy saving recommendations.
To allow compliance with these standards also in two-stage power-factor-corrected systems,
an interface with the PFC controller is provided that enables the pre-regulator to be switched
off between one burst and the following one.
An innovative adaptive UVLO helps minimize the issues related to fluctuations of the self-
supply voltage with the output load, due to the transformer's parasitic.
IC protection functions include: not-latched input undervoltage (brownout), a first-level OCP
with delayed shutdown able to protect the system during overload and short-circuit
conditions (either auto-restart or latch mode can be selected) and a second-level OCP that
latches off the IC when the transformer saturates or one of the secondary diodes fails short.
Finally, a latched disable function allows easy implementation of OTP or OVP.
Programmable soft-start and digital leading-edge blanking on the current sense input pin
complete the equipment of the IC.
Figure 2. Typical system block diagram
Pin settings L6591
4/41 Doc ID 14821 Rev 6
2 Pin settings
2.1 Connection
Figure 3. Pin connection (top view)
2.2 Functions
Table 1. Pin functions
L6591 Pin settings
Doc ID 14821 Rev 6 5/41
Table 1. Pin functions (continued)
