ML4826 Просмотр технического описания (PDF) - Micro Linear Corporation
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ML4826 Datasheet PDF : 16 Pages
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ML4826
PIN CONFIGURATION
ML4826
20-Pin PDIP (P20)
20-Pin SOIC (S20)
IEAO 1
IAC 2
ISENSE 3
VRMS 4
SS 5
VDC 6
RTCT 7
RAMP 1 8
RAMP 2 9
DC ILIMIT 10
20 VEAO
19 VFB
18 VREF
17 VCC2
16 VCC1
15 PFC OUT
14 PWM 1
13 PWM 2
12 PGND
11 AGND
TOP VIEW
PIN DESCRIPTION
PIN NAME
1 IEAO
2 IAC
3 ISENSE
4 VRMS
5 SS
6 VDC
7 RTCT
8 RAMP 1
9 RAMP 2
10 DC ILIMIT
FUNCTION
PFC transconductance current error
amplifier output
PFC gain control reference input
Current sense input to the PFC current
limit comparator
Input for PFC RMS line voltage
compensation
Connection point for the PWM soft start
capacitor
PWM voltage feedback input
Connection for oscillator frequency
setting components
PFC ramp input
When in current mode, this pin
functions as the current sense input;
when in voltage mode, it is the PWM
input from the PFC output (feedforward
ramp)
PWM current limit comparator input
PIN NAME
11 AGND
FUNCTION
Analog signal ground
12 PGND
Return for the PWM totem-pole
outputs
13 PWM 2 PWM driver 2 output
14 PWM 1 PWM drive 1 output
15 PFC OUT PFC driver output
16 VCC2
Positive supply for the PWM drive
outputs
17 VCC1
Positive supply (connected to an
internal shunt regulator).
18 VREF
Buffered output for the internal 7.5V
reference
19 VFB
PFC transconductance voltage error
amplifier input
20 VEAO
PFC transconductance voltage error
amplifier output
2
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