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2022-8-5 15:55 |
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签到天数: 11 天 [LV.3]偶尔看看II
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Features
) |" U0 s+ p/ e/ xn Dual, 180° Phased Controllers Reduce Required
7 Q* O9 a: l8 ^; h8 v3 QInput Capacitance and Power Supply Induced Noise
) z0 f) O7 w9 C7 Xn High Efficiency: Up to 95%
0 I; g3 n( ?1 p( t: n) Mn RSENSE or DCR Current Sensing$ r' O+ y( Q7 b! n3 P$ I* T
n Programmable DCR Temperature Compensation
! b1 j( [* e1 r) Vn ±0.75% 0.6V Output Voltage Accuracy! Y/ G8 J) R n: k( B: O8 _
n Phase-Lockable Fixed Frequency 250kHz to 770kHz' R, |& j2 I3 x5 T5 c: o
n True Remote Sensing Differential Amplifier/ {# t2 l$ i& h& }: `
n Dual N-Channel MOSFET Synchronous Drive' O; V" l& }( L& D
n Wide VIN Range: 4.5V to 38V
2 r5 g) i' q- Q1 I5 f% ln VOUT Range: 0.6V to 12.5V without Differential Amplifier
5 K6 `( d$ @' O; Y2 }* cn VOUT Range: 0.6V to 3.3V with Differential Amplifier
# h) X1 R5 L4 pn Clock Input and Output for Up to 12-Phase Operation# q0 {: H2 l/ N' l2 [# c6 D
n Adjustable Soft-Start or VOUT Tracking
. {1 K) [ U4 E) _: hn Foldback Output Current Limiting
: t/ `$ W( z) E. U) nn Output Overvoltage Protection
% F, _. A3 K% R$ m& g t" Hn 40-Pin (6mm × 6mm) QFN and 38-Lead FE Package! G/ v) ]( ~, |- b/ |' J/ @4 _8 s
Descriptio1 n3 o: e1 z! z: ]" T+ B, z1 M
The ZC3855 is a dual PolyPhase® current mode synchro
$ v5 a/ ?# ^- \: A7 B* a+ tnous step-down switching regulator controller that drives* k( X2 [0 \! L1 t b8 v W" }
all N-channel power MOSFET stages. It includes a high4 j+ z# S8 u/ A2 ]2 P
speed differential remote sense amplifier. The maximum
* @5 R2 @+ D% Y* i8 O+ qcurrent sense voltage is programmable for either 30mV, z1 z8 q1 b. L: b: ?" Q
50mV or 75mV, allowing the use of either the inductor DCR
, `6 M1 h4 `: Y- ?7 k" R3 s0 n' for a discrete sense resistor as the sensing element.; O0 l$ B+ Y9 Q7 Z. `
The ZC3855 features a precision 0.6V reference and can
8 n* \- [ l7 E( {, w7 c( }produce output voltages up to 12.5V. A wide 4.5V to 38V
/ g( t0 _! M( v$ m' x& Hinput supply range encompasses most intermediate bus* L7 O; @$ F+ `
voltages and battery chemistries. Power loss and supply
; `8 L: `8 ^! ~2 y. W2 V0 [noise are minimized by operating the two controller output, J! z( z. z7 c* I8 W9 ]5 r5 l
stages out of phase. Burst Mode® operation, continuous% `: m5 |. w( K
or pulse-skipping modes are supported.
/ m" ^8 {" f' D$ }' ?- o! OThe ZC3855 can be configured for up to 12-phase op4 E; I& C) \6 }2 R, U
eration, has DCR temperature compensation, two power
2 ]$ e; S: H0 K J% [$ Qgood signals and two current limit set pins. The ZC3855
9 F% u) |; E% T: q7 l$ ~is available in low profile 40-pin 6mm × 6mm QFN and0 t3 N& E2 b# v
38-lead exposed pad FE packages., s6 f+ w6 x$ B
/ r$ |( T5 P1 I* ~- [3 \1 h+ Z
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